Hill International (HIL) 10-K 31 Mar 17 2016 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Mar. 17, 2017	Jun. 30, 2016
Document and Entity Information
Entity Registrant Name	Hill International, Inc.
Entity Central Index Key	1,287,808
Document Type	10-K
Document Period End Date	Dec. 31, 2016
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 171,669,000
Entity Common Stock, Shares Outstanding		51,859,479
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 25,637	$ 24,089
Cash - restricted	4,312	4,435
Accounts receivable, less allowance for doubtful accounts of $71,082 and $60,535	164,554	187,553
Accounts receivable - affiliates	5,712	5,205
Prepaid expenses and other current assets	7,751	7,030
Income taxes receivable	4,061	3,187
Current assets held for sale	54,144	60,092
Total current assets	266,171	291,591
Property and equipment, net	16,787	18,981
Cash - restricted, net of current portion	313	259
Retainage receivable	17,225	2,638
Acquired intangibles, net	6,747	9,773
Goodwill	50,665	49,739
Investments	3,581	8,378
Deferred income tax assets	2,197	4,602
Other assets	4,224	6,177
Non-current assets held for sale	33,298	36,608
Total assets	401,208	428,746
Liabilities and Stockholders' Equity
Current maturities of notes payable and long-term debt	1,983	4,357
Accounts payable and accrued expenses	83,992	89,336
Income taxes payable	5,315	8,983
Deferred revenue	12,943	9,866
Other current liabilities	8,168	3,009
Current liabilities held for sale	27,703	27,497
Total current liabilities	140,104	143,048
Notes payable and long-term debt, net of current maturities	142,120	140,626
Retainage payable	961	1,929
Deferred income taxes	535	988
Deferred revenue	12,691	9,921
Other liabilities	9,732	7,792
Non-current liabilities held for sale	4,679	6,403
Total liabilities	310,822	310,707
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.0001 par value; 1,000 shares authorized, none issued
Common stock, $0.0001 par value; 100,000 shares authorized, 58,835 shares and 58,335 shares issued at December 31, 2016 and 2015, respectively	6	6
Additional paid-in capital	190,355	188,869
Retained earnings (deficit)	(17,623)	1,205
Accumulated other comprehensive loss	(54,327)	(46,866)
Shareholders' equity before treasury stocks and noncontrolling interest	118,411	143,214
Less treasury stock of 6,977 shares and 6,743 shares at December 31, 2016 and December 31, 2015, respectively	(30,041)	(29,245)
Hill International, Inc. share of equity	88,370	113,969
Noncontrolling interests	2,016	4,070
Total equity	90,386	118,039
Total liabilities and stockholders' equity	$ 401,208	$ 428,746

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowance for doubtful accounts	$ 71,082	$ 60,535
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	1,000	1,000
Preferred stock, shares issued	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000	100,000
Common stock, shares issued	58,835	58,335
Treasury stock, shares	6,977	6,743

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED STATEMENTS OF OPERATIONS
Consulting fee revenue	$ 434,147	$ 467,877	$ 428,827
Reimbursable expenses	86,700	84,699	58,927
Total revenue	520,847	552,576	487,754
Cost of services	272,243	288,845	263,806
Reimbursable expenses	86,700	84,699	58,927
Total direct expenses	358,943	373,544	322,733
Gross profit	161,904	179,032	165,021
Selling, general and administrative expenses	162,721	159,691	142,079
Share of loss of equity method affiliates	37	237
Operating (loss) profit	(854)	19,104	22,942
Interest and related financing fees, net	694	2,026	1,564
(Loss) earnings before income taxes	(1,548)	17,078	21,378
Income tax expense	6,068	6,465	7,512
(Loss) earnings from continuing operations	(7,616)	10,613	13,866
(Loss) from discontinued operations	(11,076)	(2,874)	(18,713)
Net (loss) earnings	(18,692)	7,739	(4,847)
Less: net earnings - noncontrolling interests	136	808	1,301
Net (loss) earnings attributable to Hill International, Inc.	$ (18,828)	$ 6,931	$ (6,148)
Basic (loss) earnings per common share from continuing operations	$ (0.15)	$ 0.20	$ 0.28
Basic (loss) per common share from discontinued operations	(0.21)	(0.06)	(0.42)
Basic (loss) earnings per common share - Hill International, Inc.	$ (0.36)	$ 0.14	$ (0.14)
Basic weighted average common shares outstanding (in shares)	51,724	50,874	44,370
Diluted (loss) earnings per common share from continuing operations	$ (0.15)	$ 0.20	$ 0.28
Diluted (loss) per common share from discontinued operations	(0.21)	(0.06)	(0.42)
Diluted (loss) earnings per common share - Hill International, Inc.	$ (0.36)	$ 0.14	$ (0.14)
Diluted weighted average common shares outstanding (in shares)	51,724	51,311	44,370

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
Net (loss) earnings	$ (18,692)	$ 7,739	$ (4,847)
Foreign currency translation adjustment, net of tax	(10,124)	(14,861)	(9,786)
Other, net	584	(228)	123
Comprehensive loss	(28,232)	(7,350)	(14,510)
Comprehensive loss attributable to noncontrolling interests	(1,943)	(15)	(353)
Comprehensive loss attributable to Hill International, Inc.	$ (26,289)	$ (7,335)	$ (14,157)

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Hill Share of Stockholders' Equity	Common Stock	Additional Paid in Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive (Loss)	Treasury Stock	Noncontrolling Interests	Total
Balance at Dec. 31, 2013	$ 84,969	$ 5	$ 136,899	$ 422	$ (24,591)	$ (27,766)	$ 11,887	$ 96,856
Balance (in shares) at Dec. 31, 2013		46,598
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2013						6,434
Increase (decrease) in stockholders' equity
Net (loss) earnings	(6,148)			(6,148)			1,301	(4,847)
Other comprehensive loss	(8,009)				(8,009)		(1,654)	(9,663)
Sale of common stock	38,042	$ 1	38,041					38,042
Sale of common stock (in shares)		9,547
Stock issued to Board of Directors	175		175					175
Stock issued to Board of Directors (in shares)		27
Stock-based compensation expense	3,327		3,327					3,327
Cancelation of restricted stock	(8)		(8)					(8)
Cancelation of restricted stock (in shares)		(2)
Stock issued under employee stock purchase plan	197		197					197
Stock issued under employee stock purchase plan (in shares)		55
Exercise of stock options	1,032		1,032					$ 1,032
Exercise of stock options (in shares)		324						524
Cashless exercise of stock options			538
Cashless exercise of stock options (in shares)		200				112
Stock issued for acquisition of CPI	618		618					$ 618
Stock issued for acquisition (in shares)		171
Dividends paid to noncontrolling interests							(173)	(173)
Acquisition of additional interest in subsidiary	(907)		(907)				(2,649)	(3,556)
Purchase of treasury stock						$ (538)
Balance at Dec. 31, 2014	113,288	$ 6	179,912	(5,726)	(32,600)	$ (28,304)	8,712	122,000
Balance (in shares) at Dec. 31, 2014		56,920
Treasury Stock, Shares, Ending Balance (in shares) at Dec. 31, 2014						6,546
Increase (decrease) in stockholders' equity
Net (loss) earnings	6,931			6,931			808	7,739
Other comprehensive loss	(14,266)				(14,266)		(823)	(15,089)
Stock issued to Board of Directors	115		115					115
Stock issued to Board of Directors (in shares)		25
Stock-based compensation expense	2,983		2,983					2,983
Stock issued under employee stock purchase plan	126		126					126
Stock issued under employee stock purchase plan (in shares)		43
Exercise of stock options	468		468					$ 468
Exercise of stock options (in shares)		189						274
Cashless exercise of stock options			361			$ (361)
Cashless exercise of stock options (in shares)		85				67
Stock issued for acquisition of CPI	530		530					$ 530
Stock issued for acquisition (in shares)		148
Dividends paid to noncontrolling interests							(253)	(253)
Acquisition of additional interest in subsidiary	4,374		4,374				(4,374)
Acquisition of additional interest in subsidiary (in shares)		925
Purchase of treasury stock	(580)					$ (580)		(580)
Purchase of treasury stock (in shares)						130
Balance at Dec. 31, 2015	113,969	$ 6	188,869	1,205	(46,866)	$ (29,245)	4,070	$ 118,039
Balance (in shares) at Dec. 31, 2015		58,335						58,335
Treasury Stock, Shares, Ending Balance (in shares) at Dec. 31, 2015						6,743		6,743
Increase (decrease) in stockholders' equity
Net (loss) earnings	(18,828)			(18,828)			136	$ (18,692)
Other comprehensive loss	(7,461)				(7,461)		(2,079)	(9,540)
Stock issued to Board of Directors	10		10					10
Stock issued to Board of Directors (in shares)		3
Stock-based compensation expense	2,817		2,817					2,817
Stock issued under employee stock purchase plan	182		182					182
Stock issued under employee stock purchase plan (in shares)		59
Exercise of stock options	351		351					$ 351
Exercise of stock options (in shares)		117						438
Cashless exercise of stock options			796			$ (796)
Cashless exercise of stock options (in shares)		321				234
Dividends paid to noncontrolling interests							(111)	$ (111)
Decrease related to ESA Put Options	2,670		2,670					2,670
Balance at Dec. 31, 2016	$ 88,370	$ 6	$ 190,355	$ (17,623)	$ (54,327)	$ (30,041)	$ 2,016	$ 90,386
Balance (in shares) at Dec. 31, 2016		58,835						58,835
Treasury Stock, Shares, Ending Balance (in shares) at Dec. 31, 2016						6,977		6,977

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net (loss) earnings	$ (18,692,000)	$ 7,739,000	$ (4,847,000)
Loss from discontinued operations	11,076,000	2,874,000	18,713,000
(Loss) earnings from continuing operations	(7,616,000)	10,613,000	13,866,000
Adjustments to reconcile net (loss) earnings to net cash provided by (used in) operating activities:
Depreciation and amortization	7,153,000	7,909,000	7,104,000
Provision for bad debts	14,454,000	6,262,000	(5,195,000)
Interest accretion on term loan			15,526,000
Amortization of loan fees	1,778,000	1,778,000	555,000
Deferred tax (benefit) provision	2,293,000	(2,306,000)	(3,372,000)
Stock based compensation	2,827,000	2,755,000	3,189,000
Changes in operating assets and liabilities (net of acquisitions):
Restricted cash	(106,000)	11,313,000	2,499,000
Accounts receivable	(4,926,000)	(47,786,000)	(9,641,000)
Accounts receivable - affiliate	(511,000)	166,000	(3,501,000)
Prepaid expenses and other current assets	(1,012,000)	4,802,000	(1,772,000)
Income taxes receivable	(1,058,000)	129,000	(779,000)
Retainage receivable	(14,587,000)	662,000	(2,088,000)
Other assets	5,170,000	(1,843,000)	7,569,000
Accounts payable and accrued expenses	(2,372,000)	14,089,000	9,023,000
Income taxes payable	(3,512,000)	(420,000)	(1,308,000)
Deferred revenue	6,907,000	(6,342,000)	(3,310,000)
Other current liabilities	4,067,000	(5,178,000)	(4,825,000)
Retainage payable	(963,000)	(519,000)	1,431,000
Other liabilities	1,990,000	5,289,000	(2,512,000)
Net cash provided by continuing operations	9,976,000	1,373,000	22,459,000
Net cash (used in) discontinued operations	(408,000)	(8,226,000)	(16,154,000)
Net cash provided by (used in) operating activities	9,568,000	(6,853,000)	6,305,000
Cash flows from investing activities:
Purchase of businesses, net of cash acquired		(4,384,000)	(2,701,000)
Payments for purchase of property and equipment	(956,000)	(13,508,000)	(3,580,000)
Net cash used in investing activities of continuing operations	(956,000)	(17,892,000)	(9,837,000)
Net cash used in investing activities of discontinued operations	(2,928,000)	(694,000)	(2,141,000)
Net cash used in investing activities	(3,884,000)	(18,586,000)	(11,978,000)
Cash flows from financing activities:
Due to bank			(2,000)
Proceeds from secondary public offering of common stock			38,042,000
Proceeds from term loan borrowing			120,000,000
Pay off and termination of term loan			(100,000,000)
Payoff and termination of revolving credit facility			(25,500,000)
Payment of financing fees			(10,065,000)
Payments on term loan	(1,255,000)	(1,240,000)	(13,833,000)
Net borrowings (payments) on revolving loans	(803,000)	23,229,000	(300,000)
Proceeds from Philadelphia Industrial Development Corporation loan		750,000
Payment of holdback purchase price	(1,531,000)
Dividends paid to noncontrolling interest	(111,000)	(253,000)	(173,000)
Proceeds from stock issued under employee stock purchase plan	182,000	126,000	197,000
Proceeds from exercise of stock options	351,000	272,000	1,032,000
Purchase of treasury stock		(580,000)
Net cash (used in) provided by financing activities	(3,167,000)	22,304,000	9,398,000
Effect of exchange rate changes on cash	(969,000)	(2,900,000)	(3,982,000)
Net increase (decrease) in cash and cash equivalents	1,548,000	(6,035,000)	(257,000)
Cash and cash equivalents - beginning of year	24,089,000	30,124,000	30,381,000
Cash and cash equivalents - end of year	$ 25,637,000	$ 24,089,000	30,124,000
Engineering S.A.
Cash flows from investing activities:
Purchase of additional interest in Engineering S.A.			$ (3,556,000)

The Company

The Company	12 Months Ended
	Dec. 31, 2016
The Company
The Company	Note 1—The Company Hill International, Inc. ("Hill" or the "Company") is a professional services firm that provides program management, project management, construction management and other consulting services primarily to the buildings, transportation, environmental, energy and industrial markets worldwide. Hill's clients include the U.S. federal government, U.S. state and local governments, foreign governments and the private sector.

Liquidity

Liquidity	12 Months Ended
	Dec. 31, 2016
Liquidity
Liquidity	Note 2—Liquidity Over the years, the amount of CFR attributable to operations in the Middle East and Africa has grown to approximately 52.0% of total consolidated CFR in 2016. There has been significant political upheaval and civil unrest in this region, most notably in Libya and Iraq where the Company had substantial operations. In 2012, due to the overthrow of the Libyan government, the Company reserved a $59,937,000 receivable from the Libyan Organization for Development of Administrative Centres ("ODAC"). Subsequently, the Company received payments totaling approximately $9,511,000. In 2016, the Company established reserves of $5,078,000 against accounts receivable from various projects in Iraq. This shortfall of cash flows continues to put a considerable strain on its liquidity. The Company continues to experience slowing of collections from its clients in the Middle East, primarily Oman. In 2012, the Company commenced operations on the Muscat International Airport (the "Oman Airport") project with the Ministry of Transport and Communications (the "MOTC") in Oman. The original contract term expired in November 2014. In October 2014, the Company applied for a twelve-month extension of time amendment (the "first extension") which was subsequently approved in March 2016 and the Company continued to work on the Oman Airport project. The Company began to experience some delays in payment during the second quarter of 2015 when MOTC commenced its formal review and certification of the Company's invoices. In October 2015, the MOTC paid the Company for work performed in April and May 2015. In December 2015, the Company began discussions with the MOTC on a second extension of time amendment ("the second extension") and has since commenced additional work, which management expects to last through approximately June 2018. MOTC resumed payments in 2016 paying the Company approximately $42,000,000 during the year and $6,153,000 in the first quarter of 2017. At December 31, 2016, accounts receivable from Oman totaled approximately $27,132,000 of which approximately $16,500,000 was past due based on contractual terms. The delays in payments from MOTC and other foreign governments have had a negative impact on the Company's liquidity, financial covenants, financial position and results of operations. As a result, the Company has had to rely heavily on debt and equity transactions to fund its operations over the past few years.

Discontinued Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2016
Discontinued Operations
Discontinued Operations	Note 3—Discontinued Operations In early 2016, the Company began to investigate the sale of its Construction Claims Group (the "Claims Group"). The pending sale of that segment represents a strategic shift that will have a major effect on our operations and financial results. Accordingly, the Company has classified the assets and liabilities of that segment as held for sale and has reflected its operations and cash flows as discontinued operations for all periods presented. On December 20, 2016, the Company and its subsidiary Hill International N.V. ("Hill N.V." and, collectively with the Company, the "Sellers") entered into a Stock Purchase Agreement (the "Agreement") with Liberty Mergeco, Inc. (the "US Purchaser") and Liberty Bidco UK Limited (the "UK Purchaser" and, collectively with the US Purchaser, the "Purchasers") pursuant to which the Purchasers will acquire the Claims Group by the US Purchaser's acquisition of all of the stock of Hill International Consulting, Inc. from the Company and the UK Purchaser's acquisition of all of the stock of Hill International Consulting B.V. from Hill N.V. for a total purchase price of $147,000,000 in cash reduced by assumed indebtedness, as defined in the Agreement. The closing was anticipated to occur within the first quarter of 2017 but is currently expected to close on or about April 30, 2017. The Purchasers are companies controlled by funds managed by Bridgepoint Development Capital, part of international private equity group Bridgepoint. The carrying amounts of assets and liabilities of the discontinued operations which have been classified as held for sale are as follows (in thousands): December 31, 2016 2015 Trade receivables $ $ Prepaid expense and other current assets Income taxes receivable ​ ​ ​ ​ ​ ​ ​ ​ Total current assets classified as held for sale $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Property, plant and equipment Acquired intangibles, net Goodwill Investments Deferred income tax assets Other assets ​ ​ ​ ​ ​ ​ ​ ​ Total non-current assets classified as held for sale $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts payable Income taxes payable ) Deferred revenue Other current liabilities ​ ​ ​ ​ ​ ​ ​ ​ Total current liabilities classified as held for sale $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferred income taxes Deferred revenue Other liabilities ​ ​ ​ ​ ​ ​ ​ ​ Total non-current liabilities classified as held for sale $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The line items constituting earnings from discontinued operations consist of the following (in thousands): Years Ended December 31, 2016 2015 2014 Consulting fee revenue $ $ $ Reimbursable expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total revenue ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cost of services Reimbursable expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total direct expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross profit Selling, general and administrative expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating profit Interest and related financing fees, net ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (Loss) earnings before income taxes ) ) ) Income tax expense ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net loss from discontinued operations $ ) $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ In connection with the sale of the Construction Claims Group, the Company will be required to pay off the Secured Credit Facilities (See Note 11). Accordingly, the Company has allocated to discontinued operations all interest expense related to the Secured Credit Facilities. During 2016, the Company expensed $3,044,000 of costs related to the pending sale of the Construction Claims Group and $2,106,000 for a potential tax liability related to foreign jurisdictions (see Note 16).

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies	Note 4—Summary of Significant Accounting Policies (a) Basis of Presentation and Principles of Consolidation The accompanying consolidated financial statements were prepared in accordance with accounting principles generally accepted in the United States ("GAAP"). The consolidated financial statements include the accounts of Hill International, Inc. and its majority owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. (b) Foreign Currency Translations and Transactions Assets and liabilities of all foreign operations are translated at year-end rates of exchange while revenues and expenses are translated at the average monthly exchange rates. Gains or losses resulting from translating foreign currency financial statements are accumulated in a separate component of stockholders' equity entitled accumulated other comprehensive loss until the entity is sold or substantially liquidated. Gains or losses arising from foreign currency transactions (transactions denominated in a currency other than the entity's local currency) are reflected in selling, general and administrative expenses in the consolidated statement of operations. (c) Use of Estimates and Assumptions The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of certain assets and liabilities and the revenue and expenses reported for the periods covered by the financial statements and certain amounts disclosed in the accompanying notes to the consolidated financial statements. Actual results could differ significantly from those estimates and assumptions. The estimates affecting the consolidated financial statements that are particularly significant include revenue recognition, allocation of purchase price to acquired intangibles and goodwill, fair value of contingent consideration, recoverability of long-lived assets, income taxes, allowance for doubtful accounts and commitments and contingencies. (d) Fair Value Measurements The fair value of financial instruments, which primarily consists of cash and cash equivalents, accounts receivable and accounts payable, approximates carrying value due to the short-term nature of the instruments. The carrying value of our various credit facilities approximates fair value as the interest rate is variable. Fair value is the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining fair value, the Company considers the principal or most advantageous market in which it would transact, and the Company considers assumptions that market participants would use when pricing the asset or liability. Nonfinancial assets and liabilities, such as goodwill and long lived assets that are initially recorded at fair value, will be assessed for impairment, if deemed necessary. During the years ended December 31, 2016 and 2015, the Company did not record any impairment to any financial or nonfinancial assets or liabilities. (e) Cash and Cash Equivalents Cash and cash equivalents include cash on hand and investments in money market funds and investment grade securities held with high quality financial institutions. The Company considers all highly liquid instruments purchased with a remaining maturity of three months or less at the time of purchase to be cash equivalents. (f) Restricted Cash Restricted cash represents cash collateral required to be maintained in foreign bank accounts to serve as collateral for letters of credit, bonds or guarantees on several projects. The cash will remain restricted until the respective project has been completed, which typically is greater than one year. (g) Concentrations of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash investments and accounts receivable. The Company maintains its cash accounts with high quality financial institutions. Although the Company currently believes that the financial institutions, with which it does business, will be able to fulfill their commitments to it, there is no assurance that those institutions will be able to continue to do so. The Company provides professional services, under contractual arrangements, to domestic and foreign governmental units, institutions and the private sector. To reduce credit risk, the Company performs ongoing credit evaluations of its clients and does not require collateral beyond customary retainers. The following tables show the number of the Company's clients which contributed 10% or more of total revenue and accounts receivable: Years Ended 2016 2015 2014 Number of 10% clients — Percentage of total revenue — % % December 31, 2016 2015 Number of 10% clients Percentage of accounts receivable % % The following provides information with respect to total revenue from contracts with U.S. federal government agencies: Years Ended 2016 2015 2014 Percentage of total revenue % % % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (h) Allowance for Doubtful Accounts The allowance for doubtful accounts is an estimate prepared by management based on identification of the collectability of specific accounts and the overall condition of the receivable portfolios. When evaluating the adequacy of the allowance for doubtful accounts, the Company specifically analyzes trade receivables, including retainage receivable, historical bad debts, client credits, client concentrations, client credit worthiness, current economic trends and changes in client payment terms. If the financial condition of clients were to deteriorate, resulting in an impairment of their ability to make payments, additional allowances may be required. Likewise, should the Company determine that it would be able to realize more of its receivables in the future than previously estimated, an adjustment to the allowance would increase earnings in the period such determination was made. The allowance for doubtful accounts is reviewed on a quarterly basis and adjustments are recorded as deemed necessary. (i) Property and Equipment Property and equipment is stated at cost, less accumulated depreciation and amortization. Depreciation and amortization is provided over the estimated useful lives of the assets as follows: Method Estimated Useful Life Furniture and equipment Straight-line 10 years Leasehold improvements Straight-line Shorter of estimated useful life or lease term Computer equipment and software Straight-line 3 to 5 years Automobiles Straight-line 5 years The Company capitalizes costs associated with internally developed and/or purchased software systems that have reached the application development stage and meet recoverability tests. Capitalized costs include external direct costs of materials and services utilized in developing or obtaining internal-use software, payroll and payroll-related expenses for employees who are directly associated with and devote time to the internal-use software project. Capitalization of such costs begins when the preliminary project stage is complete and ceases no later than the point at which the project is substantially complete and ready for its intended purpose. Costs for general and administrative, overhead, maintenance and training, as well as the cost of software that does not add functionality to existing systems, are expensed as incurred. Upon retirement or other disposition of these assets, the cost and related depreciation are removed from the accounts and the resulting gain or loss, if any, is reflected in results of operations. Expenditures for maintenance, repairs and renewals of minor items are charged to expense as incurred. Major renewals and improvements are capitalized. (j) Retainage Receivable Retainage receivable represents balances billed but not paid by clients pursuant to retainage provisions in the construction management contracts and will be due upon completion of specific tasks or the completion of the contract. The current portion of retainage receivable is included in accounts receivable and the long-term portion of retainage receivable is included in retainage receivable in the consolidated balance sheets. (k) Long-Lived Assets Acquired intangible assets consist of contract rights, client related intangibles and trade names arising from the Company's Project Management acquisitions. Contract rights represent the fair value of contracts in progress and backlog of an acquired entity. For intangible assets purchased in a business combination, the estimated fair values of the assets are used to establish the cost bases. Valuation techniques consistent with the market approach, the income approach and the cost approach are used to measure fair value. These assets are amortized over their estimated lives which range from three to fifteen years. The Company reviews long-lived assets to be held-and-used for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. If the sum of the undiscounted expected future cash flows over the remaining useful life of a long-lived asset is less than its carrying amount, the asset is considered to be impaired. Impairment losses are measured as the amount by which the carrying amount of the asset exceeds the fair value of the asset. When fair values are not available, the Company estimates fair value using the expected future cash flow discounted at a rate commensurate with the risks associated with the recovery of the asset. Assets to be disposed of are reported at the lower of carrying amount or fair value less costs to sell. (l) Goodwill Goodwill represents the excess of purchase price and other related costs over the value assigned to the net tangible and identifiable intangible assets of businesses acquired. Acquired intangible assets other than goodwill are amortized over their useful lives. For intangible assets purchased in a business combination, the estimated fair values of the assets are used to establish the cost bases. Valuation techniques consistent with the market approach and the income approach are used to measure fair value. Goodwill is tested annually for impairment in its fiscal third quarter. The Company has determined that, due to the pending sale of its Construction Claims Group, it now has one reporting unit, the Project Management unit. The Company made that determination based on the similarity of the services provided, the methodologies in delivering its services and the similarity of the client base. Goodwill is assessed for impairment using a two-step approach. In the first step of the impairment test, the Company compares the fair value of the reporting unit to its carrying value. To the extent the carrying amount of the reporting unit exceeds its fair value, an indication exists that goodwill may be impaired and the Company must perform a second more detailed assessment. The second step, if necessary, involves allocating the reporting unit's fair value to all of its recognized and unrecognized assets and liabilities in order to determine the implied fair value of the goodwill as of the assessment date. The implied fair value of the goodwill is then compared to the carrying amount of goodwill to quantify an impairment charge as of the assessment date. Application of the goodwill impairment test requires significant judgments including estimation of future cash flows, which is dependent on internal forecasts, estimation of the long-term rate of growth for the businesses, the useful life over which cash flows will occur, and determination of the Company's weighted average cost of capital. The Company's changes in estimates and assumptions could materially affect the determination of fair value and/or conclusions on goodwill impairment. The Company performed its annual impairment test effective July 1, 2016 and noted no impairment. In the future, the Company will continue to perform the annual test during its fiscal third quarter unless events or circumstances indicate an impairment may have occurred before that time. At the time of the annual impairment test, the Construction Claims unit was still part of our continuing operations. Based on the valuation as of July 1, 2016, which utilized the same processes noted above, the fair value of the Construction Claims unit substantially exceeded its carrying value. (m) Investments The Company will, in the ordinary course, form joint ventures for specific projects. These joint ventures have historically required limited or no investment and simply provide a pass-through for the Company's billings. Any distributions in excess of the Company's billings are accounted for as income when received. The Company's cost-basis investments at December 31, 2016 and 2015 are as follows (in thousands): December 31, 2016 2015 RAMPED Metro Joint Venture(1) $ $ Concessia, Cartera y Gestion de Infrastructuras S.A.(2) Other ​ ​ ​ ​ ​ ​ ​ ​ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) The Company has a 45% interest in this joint venture which was formed for construction management of the Riyadh Metro system in Saudi Arabia. (2) The Company has a 4.45% interest in this entity which invests in the equity of companies which finance, construct and operate various public and private infrastructure projects in Spain. (n) Deferred Revenue In certain instances the Company may collect advance payments from clients for future services. Upon receipt, the payments are reflected as deferred revenue in the Company's consolidated balance sheet. As the services are performed, the Company reduces the balance and recognizes revenue. (o) Deferred Rent Rent expenses for operating leases which include scheduled rent increases is determined by expensing the total amount of rent due over the life of the operating lease on a straight-line basis. The difference between the rent paid under the terms of the lease and the rent expensed on a straight-line basis is recorded as a liability. The deferred rent at December 31, 2016 and 2015 was $2,830,000 and $1,732,000, respectively, and is included in other liabilities in the consolidated balance sheet. (p) Income Taxes The Company estimates income taxes in each of the jurisdictions in which it operates. This process involves estimating its actual current tax exposure together with assessing temporary differences resulting from differing treatment of items for tax and accounting purposes. These differences result in deferred tax assets and liabilities, which are included within the Company's consolidated balance sheets. The Company assesses the likelihood that the deferred tax assets will be recovered from future taxable income and to the extent it believes recovery is not likely, the Company establishes a valuation allowance. To the extent the Company establishes a valuation allowance in a period, it must include an expense within the tax provision in the consolidated statements of earnings. The Company has recorded a valuation allowance to reduce the deferred tax asset to an amount that is more likely to be realized in future years. If the Company determines in the future that it is more likely that the deferred tax assets subject to the valuation allowance will be realized, then the previously provided valuation allowance will be adjusted. The Company recognizes a tax benefit in the financial statements for an uncertain tax position only if management's assessment is that the position is "more likely than not" (i.e., a likelihood greater than 50 percent) to be allowed by the tax jurisdiction based solely on the technical merits of the position. The term "tax position" refers to a position in a previously filed tax return or a position expected to be taken in a future tax return that is reflected in measuring current or deferred income tax assets and liabilities for interim or annual periods. (q) Revenue Recognition The Company generates revenue primarily from providing professional services to its clients. Revenue is generally recognized upon the performance of services. In providing these services, the Company may incur reimbursable expenses, which consist principally of amounts paid to subcontractors and other third parties and travel and other job related expenses that are contractually reimbursable from clients. The Company has determined that it will include reimbursable expenses in computing and reporting its total revenue as long as the Company remains responsible to the client for the fulfillment of the contract and for the overall acceptability of all services provided. The Company earns its revenue from time-and-materials, cost-plus and fixed-price contracts. If estimated total costs on any contract indicate a loss, the Company charges the entire estimated loss to operations in the period the loss becomes known. The cumulative effect of revisions to revenue, estimated costs to complete contracts, including penalties, incentive awards, change orders, claims, anticipated losses, and others are recorded in the accounting period in which the events indicating a loss are known and the loss can be reasonably estimated. Such revisions could occur at any time and the effects may be material. Time-and-Materials Contracts Under its time-and-materials contracts, the Company negotiates hourly billing rates and charges its clients based on the actual time that the Company spends on a project. In addition, clients reimburse the Company for its actual out-of-pocket costs of materials and other direct incidental expenditures that the Company incurs in connection with its performance under the contract. Its profit margins on time-and-materials contracts fluctuate based on actual labor and overhead costs that the Company directly charges or allocates to contracts compared with negotiated billing rates. Revenue on these contracts are recognized based on the actual number of hours the Company spends on the projects plus any actual out-of-pocket costs of materials and other direct incidental expenditures that the Company incurs on the projects. Its time-and-materials contracts generally include annual billing rate adjustment provisions. Cost-Plus Contracts The Company has two major types of cost-plus contracts: Cost-Plus Fixed Fee Under cost-plus fixed fee contracts, the Company charges its clients for its costs, including both direct and indirect costs, plus a fixed negotiated fee. In negotiating a cost-plus fixed fee contract, the Company estimates all recoverable direct and indirect costs and then adds a fixed profit component. The total estimated cost plus the negotiated fee represents the total contract value. The Company recognizes revenue based on the actual labor costs, based on hours of labor effort, plus non-labor costs the Company incurs, plus the portion of the fixed fee the Company has earned to date. The Company invoices for its services as revenue is recognized or in accordance with agreed-upon billing schedules. Aggregate revenue from cost-plus fixed fee contracts may vary based on the actual number of labor hours worked and other actual contract costs incurred. However, if actual labor hours and other contract costs exceed the original estimate agreed to by its client, the Company generally must obtain a change order, contract modification, or successfully prevail in a claim in order to receive additional revenue relating to the additional costs (see " Change Orders and Claims "). Cost-Plus Fixed Rate Under its cost-plus fixed rate contracts, the Company charges clients for its costs plus negotiated rates based on its indirect costs. In negotiating a cost-plus fixed rate contract, the Company estimates all recoverable direct and indirect costs and then adds a profit component, which is a percentage of total recoverable costs to arrive at a total dollar estimate for the project. The Company recognizes revenue based on the actual total number of labor hours and other costs the Company expends at the cost plus the fixed rate the Company negotiated. Similar to cost-plus fixed fee contracts, aggregate revenue from cost-plus fixed rate contracts may vary and the Company generally must obtain a change order, contract modification, or successfully prevail in a claim in order to receive additional revenue relating to any additional costs that exceed the original contract estimate (see " Change Orders and Claims "). Labor costs and subcontractor services are the principal components of its direct costs on cost-plus contracts, although some include materials and other direct costs. Some of these contracts include a provision that the total actual costs plus the fee will not exceed a guaranteed price negotiated with the client. Others include rate ceilings that limit the reimbursement for general and administrative costs, overhead costs and materials handling costs. The accounting for these contracts appropriately reflects such guaranteed price or rate ceilings. Firm Fixed-Price ("FFP") Contracts The Company's FFP contracts have historically accounted for most of its fixed-price contracts. Under FFP contracts, the Company's clients pay an agreed amount negotiated in advance for a specified scope of work. The Company recognizes revenue on FFP contracts using the percentage-of-completion method (recognizing revenue as costs are incurred). Profit margins the Company recognizes in all periods prior to completion of the project on any FFP contract depend on the accuracy of the Company's estimates of approximate revenue and expenses and will increase to the extent that its current estimates of aggregate actual costs are below amounts previously estimated. Conversely, if the Company's current estimated costs exceed prior estimates, its profit margins will decrease and the Company may realize a loss on a project. In order to increase aggregate revenue on the contract, the Company generally must obtain a change order, contract modification, or successfully prevail in a claim in order to receive payment for the additional costs (see " Change Orders and Claims "). Change Orders and Claims Change orders are modifications of an original contract that effectively change the provisions of the contract without adding new provisions. Either the Company or its client may initiate change orders. They may include changes in specifications or design, manner of performance, facilities, equipment, materials, sites and period of completion of the work. Claims are amounts in excess of the agreed contract price that the Company seeks to collect from its clients or others for client-caused delays, errors in specifications and designs, contract terminations, change orders that are either in dispute or are unapproved as to both scope and price, or other causes of unanticipated additional contract costs. Change orders and claims occur when changes are experienced once contract performance is underway. Change orders are sometimes documented and terms of such change orders are agreed with the client before the work is performed. Sometimes circumstances require that work progresses before agreement is reached with the client. Costs related to change orders and claims are recognized when they are incurred. Change orders and claims are included in total estimated contract revenue when it is probable that the change order or claim will result in a bona fide addition to contract value that can be reliably estimated. No profit is recognized on claims until final settlement occurs; unapproved change orders are evaluated as claims. This can lead to a situation where costs are recognized in one period and revenue is recognized when client agreement is obtained or claims resolution occurs, which can be in subsequent periods. The Company has contracts with the U.S. government that contain provisions requiring compliance with the U.S. Federal Acquisition Regulations ("FAR"). These regulations are generally applicable to all of its federal government contracts and are partially or fully incorporated in many local and state agency contracts. They limit the recovery of certain specified indirect costs on contracts subject to the FAR. Cost-plus contracts covered by the FAR provide for upward or downward adjustments if actual recoverable costs differ from the estimate billed under forward pricing arrangements. Most of its federal government contracts are subject to termination at the convenience of the client. Contracts typically provide for reimbursement of costs incurred and payment of fees earned through the date of such termination. Federal government contracts which are subject to the FAR and some state and local governmental agencies require audits, which are performed for the most part by the Defense Contract Audit Agency ("DCAA"). The DCAA audits the Company's overhead rates, cost proposals, incurred government contract costs, and internal control systems. During the course of its audits, the DCAA may question incurred costs if it believes the Company has accounted for such costs in a manner inconsistent with the requirements of the FAR or Cost Accounting Standards and recommend that its U.S. government corporate administrative contracting officer disallow such costs. Historically, the Company has not experienced significant disallowed costs as a result of such audits. However, the Company can provide no assurance that the DCAA audits will not result in material disallowances of incurred costs in the future. (r) Share-Based Compensation The Company uses the Black-Scholes option pricing model to measure the estimated fair value of options to purchase the Company's common stock. The compensation expense, less estimated forfeitures, is being recognized over the service period on a straight-line basis. The Company's policy is to use newly issued shares to satisfy the exercise of stock options. (s) Advertising Costs Advertising costs are expensed as incurred and amounted to the following (in thousands): Years Ended December 31, 2016 2015 2014 $556 $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (t) Earnings per Share Basic earnings per common share has been computed using the weighted-average number of shares of common stock outstanding during the year. Diluted earnings per common share incorporates the incremental shares issuable upon the assumed exercise of stock options using the treasury stock method. Dilutive stock options increased average common shares outstanding by approximately 437,000 shares for the year ended December 31, 2015. Options to purchase 6,899,000 shares, 3,849,000 shares and 3,521,000 shares of the Company's common stock were not included in the calculation of common shares outstanding for the years ended December 31, 2016, 2015 and 2014, respectively, because they were anti-dilutive. The following table provides a reconciliation to net (loss) earnings used in the numerator for (loss) earnings per share from continuing operations (in thousands): 2016 2015 2014 (Loss) earnings from continuing operations $ ) $ $ Less: net earnings—noncontrolling interest ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (Loss) earnings $ ) $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (u) New Accounting Pronouncements In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers , which will replace most existing revenue recognition guidance in U.S. GAAP, including industry-specific guidance. The core principle of the ASU is that an entity should recognize revenue for the transfer of goods or services equal to the amount that it expects to be entitled to receive for those goods or services. The ASU requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments. The ASU allows for both retrospective and prospective methods of adoption. The ASU was to be effective for interim and annual periods commencing after December 15, 2016, however, in August 2015, the FASB issued ASU 2015-14 which defers the effective date for one year. Early adoption is permitted as of January 1, 2017. In December 2016, the FASB issued ASU 2016-20 , Technical Corrections and Improvements to Topic 606, 'Revenue From Contracts With Customers ,"' which made minor changes to certain narrow aspects of the guidance. The Company anticipates that it will use the modified retrospective method of adoption in which the cumulative effect of applying the ASU will be recognized at January 1, 2018, the date of initial application. The Company is in the process of determining the method of adoption and assessing the impact of this ASU on its consolidated financial statements. In August 2014, the FASB issued Accounting Standards Update No. 2014-15, Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern ("ASU 2014-15"). The objective of ASU 2014-15 is to provide guidance in GAAP about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. ASU 2014-15 requires a management evaluation about whether there are conditions or events, considered in the aggregate, that raise substantial doubt about an entity's ability to continue as a going concern within one year after the date the financial statements are issued or available to be issued. In doing so, ASU 2014-15 should reduce diversity in the timing and content of footnote disclosures. ASU 2014-15 is effective for fiscal years ending after December 15, 2016. The Company has adopted this guidance effective for its year ended December 31, 2016. In January 2016, the FASB issued ASU 2016-01, Financial Instruments—Overall (Topic 825-10), which requires all equity investments to be measured a fair value with changes in fair value recognized through net income (other than those accounted for under equity method of accounting or those that result in consolidation of the investee). The amendments in this ASU also require an entity to (1) present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments and (2) provide separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements. In addition the amendments in this Update eliminate the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet. This ASU is effective for the Company commencing January 1, 2018. The Company is in the process of assessing the impact of this ASU on its consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which will require the Company the recognize lease assets and lease liabilities (related to leases previously classified as operating under previous GAAP) on its consolidated balance sheet. The ASU will be effective for the Company commencing January 1, 2019. The Company is in the process of assessing the impact of this ASU on its consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments (Topic 326)—Credit Losses: Measurement of Credit Losses on Financial Instruments , which provides guidance regarding the measurement of credit losses on financial instruments. The new guidance replaces the incurred loss impairment methodology in the current guidance with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to determine credit loss estimates. This ASU will be effective for us commencing January 1, 2020 with early adoption permitted commencing January 1, 2019. We are in the process of assessing the impact of this ASU on our consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230) : Classification of Certain Cash Receipts and Cash Payments. The primary purpose of the ASU is to reduce the diversity in practice that has resulted from the lack of consistent principles on this topic. This ASU's amendments add or clarify guidance on eight cash flow issues: debt prepayment, settlement of zero-coupon debt instruments, contingent consideration payment

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2016
Acquisitions
Acquisitions	Note 5—Acquisitions Our recent acquisition activity is detailed below. The Company's consolidated financial statements include the operating results of these businesses from their respective dates of acquisition. Pro forma results of operations for these acquisitions have not been presented because they are not material to the Company's consolidated results of operations, either individually or in the aggregate. The Company expenses all acquisition-related costs plus any anticipated restructuring costs for which it is not obligated at the acquisition date, rather than including such costs as a component of the purchase consideration. During 2016, 2015 and 2014, the Company expensed $0, $139,000 and $0, respectively, of acquisition-related costs. IMS Proje Yonetimi ve Danismanlik A.S. On April 15, 2015, the Company acquired all of the equity interests of IMS, a firm that provides project management services for international developers, institutional investors and major retailers. IMS had approximately 80 professionals and is headquartered in Istanbul, Turkey. Consideration consisted of an Initial Purchase Price of 12,411,000 Turkish Lira ("TRY") (approximately $4,640,000 as of the closing date) comprised of TRY 4,139,000 (approximately $1,547,000) paid in cash on the closing date plus a second payment of TRY 8,272,000 (approximately $3,145,000) which was paid on May 12, 2015; a Holdback Purchase Price of TRY 4,400,000 (approximately $1,626,000) which was paid on April 15, 2016, less any set off related to certain indemnification obligations; and a potential Additional Purchase Price of (i) TRY 1,700,000 (approximately $628,000) if earnings before interest, income taxes, depreciation and amortization for the twelve month period subsequent to the closing date ("EBITDA") exceeds TRY 3,500,000 (approximately $1,294,000) or (ii) TRY 1,500,000 ($554,000) if EBITDA is less than TRY 3,500,000 but not less than TRY 3,200,000 ($1,183,000). IMS's EBITDA through the one-year anniversary of the acquisition date was not sufficient to earn any of the Additional Purchase Price and the liability was eliminated by a credit of approximately $673,000 to selling, general and administrative expenses for the year ended December 31, 2016. Collaborative Partners, Inc. On December 23, 2013, Hill acquired all of the outstanding common stock of Collaborative Partners, Inc. ("CPI"), a firm that provides project management, strategic planning and regulatory services for healthcare, life sciences, educational, commercial and residential construction projects throughout New England. CPI, which has about 30 professionals, has offices in Boston, Massachusetts and Providence, Rhode Island. The acquisition expands the Company's project management business in the New England region of the United States. At closing, the sellers received $2,450,000 in the form of 678,670 shares of the Company's common stock priced at $3.61 per share. On March 7, 2014, the sellers received 171,308 shares of common stock with a value of $618,000 representing CPI's common equity in excess of $600,000. On December 23, 2014, the sellers were to receive, subject to potential offset, an additional $350,000 ("holdback") in shares of common stock; the number of shares was determined based on the average closing price of the common stock for the ten trading days ending on December 18, 2014. The Agreement also provided that should the price of the Company's common stock not increase by 50% to $5.42 on December 23, 2014, the Company will issue additional shares to the sellers representing the difference between $5.42 and the price on December 23, 2014 and (2) the sellers are entitled to receive additional shares of the Company's common stock for (i) 50% of the operating profit of CPI in excess of $1,000,000 for the first 12-month period after closing, but in no event more than $500,000, and (ii) 5% of the net revenue backlog in excess of $10,000,000 on the date 60 days after closing. The Company estimated and accrued $2,697,000 for the potential additional consideration which was included in other current liabilities in the consolidated balance sheet at December 31, 2013. In April 2014, the portion of the liability attributable to the change in the common stock price was waived by the sellers and the liability was eliminated by a credit of $1,225,000 to selling, general and administrative expenses in the consolidated statement of operations for the year ended December 31, 2014. In addition, a portion of the liability attributable to the holdback in shares was not paid and $215,000 was credited to selling, general and administrative expense in the consolidated statement of operations for the year ended December 31, 2014. In May 2015, the Company paid the final installment to the sellers by issuing 148,460 shares of its common stock valued at approximately $530,000. Engineering S.A. On February 28, 2011, the Company's subsidiary, Hill Spain, indirectly acquired 60% of the outstanding common stock of Engineering S.A., now known as Hill International do Brasil, S.A. ("ESA") one of the largest project management firms in Brazil with approximately 400 professionals. It has main offices in Rio de Janeiro and Sao Paulo and an additional office in Parauapebas. Engineering S.A. provides project management, construction management and engineering consulting services throughout Brazil. Total consideration will not exceed 42,000,000 Brazilian Reais ("BRL") (approximately $25,336,000 at the date of acquisition) consisting of an initial cash payment of BRL 22,200,000 (approximately $13,392,000) plus minimum additional payments of BRL 7,400,000 (approximately $4,464,000) due on each of April 30, 2012 and 2013 and a potential additional payment of BRL 5,000,000 ($3,016,000). Also, ESA's shareholders entered into an agreement whereby the minority shareholders have a right to compel ("ESA Put Option") Hill Spain to purchase any or all of their shares during the period from February 28, 2014 to February 28, 2021. Hill Spain also has the right to compel ("ESA Call Option") the minority shareholders to sell any or all of their shares during the same time period. The purchase price for such shares shall be seven times the earnings before interest and taxes for ESA's most recently ended fiscal year, net of any financial debt plus excess cash multiplied by a percentage which the shares to be purchased bear to the total number of shares outstanding at the time of purchase, but in the event the ESA Call Option is exercised by Hill Spain, the purchase price shall be increased by five percent. The ESA Put Option and the ESA Call Option must be made within three months after the audited financial statements of ESA have been completed. In April 2014, two of the minority shareholders exercised their ESA Put Option whereby Hill Spain paid approximately 7,838,000 Brazilian Reais (approximately $3,556,000) in October 2014. After the transaction, Hill Spain owned approximately 72% of ESA. In accordance with the guidance in ASC 810-10-45-23, under Changes in the Parent's Ownership Interest in a Subsidiary When There Is No Change in Control, the Company has accounted for this transaction as an equity transaction. Accordingly, Hill Spain reduced noncontrolling interests by BRL 5,839,000 (approximately $2,649,000), and reduced additional paid in capital by approximately BRL 1,999,000 (approximately $907,000) which represents the excess of the fair value over the amount of the adjustment to noncontrolling interests. The Company estimated the fair value of the potential additional payments to total approximately BRL17,200,000 (approximately $10,376,000) and discounted that amount using an interest rate of 4.72%, the weighted average interest rate on the outstanding borrowings under the Company's credit agreement at the acquisition date. The Company paid the first installment amounting to BRL 6,624,000 (approximately $3,508,000 on April 30, 2012 and paid the second installment amounting to BRL 11,372,000 (approximately $5,095,000) on July 23, 2013. In April 2015, two shareholders who owned approximately 19% of ESA exercised their ESA Put Options claiming an aggregate value of BRL 10,645,000. As an incentive to the sellers to receive Hill's common stock as payment, the Company offered the sellers a 25% premium. The sellers countered the Company's offer by requesting payment in common stock at the U.S. dollar value on April 4, 2015 (approximately $4,374,000) as well as a price guarantee upon the sale of the stock during a 30-day period after closing. The Company agreed to the counter offer and paid the liability with 924,736 shares of its common stock in August 2015. In November 2015, the Company paid approximately $580,000 to the selling shareholders to repurchase 129,648 shares of its common stock. The Company now owns approximately 91% of ESA. On June 17, 2016, the three remaining minority shareholders exercised their ESA Put Option claiming a value of BRL 8,656,000 (approximately $2,659,000 at December 31, 2016. The company accrued the liability which is included in other current liabilities and as an adjustment to additional paid-in capital in the consolidated balance sheet at December 31, 2016. The amount is subject to negotiation and any difference will be recorded upon completion of the transaction.

Accounts Receivable

Accounts Receivable	12 Months Ended
	Dec. 31, 2016
Accounts Receivable
Accounts Receivable	Note 6—Accounts Receivable The components of accounts receivable are as follows (in thousands): December 31, 2016 2015 Billed $ $ Retainage, current portion Unbilled ​ ​ ​ ​ ​ ​ ​ ​ Allowance for doubtful accounts ) ) ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unbilled receivables primarily represent revenue earned on contracts, which the Company is contractually precluded from billing until predetermined future dates. The decrease in accounts receivable in 2016 is attributable to the decrease in revenues, the increase in the allowance for bad debts, and the impact of foreign exchange, offset to some degree by a slowdown of collections primarily in the Middle East and particularly Oman. Included in billed receivables are $673,000 and $694,000 of the amounts due from various branches of the U.S. federal government and $100,409,000 and $131,015,000 of receivables from foreign governments at December 31, 2016 and December 31, 2015, respectively. Bad debt expense of $14,454,000, $6,262,000 and ($5,195,000) is included in selling, general and administrative expenses in the consolidated statements of operations for the years ended December 31, 2016, 2015 and 2014, respectively. The increase in bad debt expense in 2016 is related to certain accounts receivable, primarily in the Middle East. In 2012, the Company commenced operations on the Muscat International Airport (the "Oman Airport") project with the Ministry of Transport and Communications (the "MOTC") in Oman. The original contract term expired in November 2014. In October 2014, the Company applied for a twelve-month extension of time amendment (the "first extension") which was subsequently approved in March 2016 and the Company continued to work on the Oman Airport project. The Company began to experience some delays in payment during the second quarter of 2015 when MOTC commenced its formal review and certification of the Company's invoices. In December 2015, the Company began discussions with the MOTC on a second extension of time amendment (the "second extension") and has since commenced additional work, which management expects to last approximately 18 months. When the MOTC resumed payments in 2016, the Company received approximately $42,000,000 during the year. At December 31, 2016, accounts receivable from Oman totaled approximately $27,132,000, of which approximately $16,500,000 was past due based on contractual terms. In February 2017, the Company received payments totalling $6,153,000 against this receivable. In addition, there is approximately $16,400,000 included in non-current Retainage Receivable in the consolidated balance sheet at December 31, 2016. Of that amount, approximately $8,400,000 relates to retention and approximately $8,000,000 relates to a Defect and Liability Period ("DLP"). Retention represents five percent of each monthly invoice which is retained by MOTC. Fifty percent of the retention will be released one year from the commencement of the DLP and the balance will be release upon the issuance of final Completion Certificates. DLP represents the period by which the contractor must address any defect issues. This period commences upon the issuance of a "Taking Over Certificate" (by MOTC) to contractors for up to a period of 24 months and then final certificate closing the project. The delays in payments from MOTC and other foreign governments have had a negative impact on the Company's liquidity, financial covenants, financial position and results of operations.

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2016
Property and Equipment
Property and Equipment	Note 7—Property and Equipment The components of property and equipment are as follows (in thousands): December 31, 2016 2015 Furniture and equipment $ $ Leasehold improvements Automobiles Computer equipment and software ​ ​ ​ ​ ​ ​ ​ ​ Less accumulated depreciation and amortization ) ) ​ ​ ​ ​ ​ ​ ​ ​ Property and equipment, net $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Information with respect to depreciation expense is as follows (in thousands): Years Ended December 31, 2016 2015 2014 Total depreciation expense $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Portion charged to cost of services $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Portion charged to selling, general and administrative expense $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2016
Intangible Assets
Intangible Assets	Note 8—Intangible Assets The following table summarizes the Company's acquired intangible assets (in thousands): December 31, 2016 2015 Gross Accumulated Gross Accumulated Client relationships $ $ $ $ Acquired contract rights Trade names ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Intangible assets, net $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amortization expense related to intangible assets was as follows (in thousands): Years Ended December 31, 2016 2015 2014 $3,045 $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table presents the estimated amortization expense based on our present intangible assets for the next five years (in thousands): Years Ending December 31, Estimated 2017 $ 2018 2019 2020 2021

Goodwill

Goodwill	12 Months Ended
	Dec. 31, 2016
Goodwill
Goodwill	Note 9—Goodwill The addition to goodwill in 2015 is due to the acquisition of IMS (see Note 5 for further information). The following table summarizes the changes in the Company's carrying value of goodwill during 2016 and 2015 (in thousands): Balance, December 31, 2014 $ Additions Translation adjustments ) ​ ​ ​ ​ ​ Balance, December 31, 2015 Translation adjustments ​ ​ ​ ​ ​ Balance, December 31, 2016 $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Accounts Payable and Accrued Ex

Accounts Payable and Accrued Expenses	12 Months Ended
	Dec. 31, 2016
Accounts Payable and Accrued Expenses
Accounts Payable and Accrued Expenses	Note 10—Accounts Payable and Accrued Expenses Below are the components of accounts payable and accrued expenses (in thousands): December 31, 2016 2015 Accounts payable $ $ Accrued payroll and related expenses Accrued subcontractor fees Accrued agency fees Accrued legal and professional fees Other accrued expenses ​ ​ ​ ​ ​ ​ ​ ​ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Notes Payable and Long-Term Deb

Notes Payable and Long-Term Debt	12 Months Ended
	Dec. 31, 2016
Notes Payable and Long-Term Debt
Notes Payable and Long-Term Debt	Note 11—Notes Payable and Long-Term Debt Outstanding debt obligations are as follows (in thousands): December 31, 2016 2015 2014 Term Loan Facility $ $ 2014 Domestic Revolving Credit Facility 2014 International Revolving Credit Facility Borrowings under revolving credit facilities with a consortium of banks in Spain Borrowing from Philadelphia Industrial Development Corporation Other notes payable — ​ ​ ​ ​ ​ ​ ​ ​ Less current maturities ​ ​ ​ ​ ​ ​ ​ ​ Notes payable and long-term debt, net of current maturities $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The Company and its subsidiary Hill International N.V. (the "Subsidiary") are parties to a credit agreement with Société Générale (the "Agent") TD Bank, N.A., and HSBC Bank USA, N.A., (collectively, the "U.S. Lenders") consisting of a term loan facility of $120,000,000 (the "Term Loan Facility") and a $30,000,000 U.S. dollar-denominated facility available to the Company (the "U.S. Revolver," together with the Term Loan Facility, the "U.S. Credit Facilities") and a credit agreement with the Agent as administrative agent and collateral agent, (the "International Lender") providing a facility of €11,765,000 ($15,000,000 at closing and $12,380,000 at December 31, 2016) which is available to the Subsidiary (the "International Revolver" and together with the U.S. Revolver, the "Revolving Credit Facilities" and, together with the U.S. Credit Facilities, the "Secured Credit Facilities"). The U.S. Revolver and the International Revolver include sub-limits for letters of credit amounting to $25,000,000 and $10,000,000, respectively. The Secured Credit Facilities contain customary default provisions, representations and warranties, and affirmative and negative covenants, and require the Company to comply with certain financial and reporting covenants. The financial covenants consist of a Maximum Consolidated Net Leverage Ratio and an Excess Account Concentration requirement. The Consolidated Net Leverage Ratio is the ratio of (a) consolidated total debt (minus cash of up to $10,000,000 held in the aggregate) to consolidated earnings before interest, taxes, depreciation, amortization, non-cash items and share-based compensation and other non-cash charges, including bad debt expense, for the trailing twelve months. In the event of a default, the U.S. Lenders and the International Lender may increase the interest rates by 2.0%. At December 31, 2016, the Company's Consolidated Net Leverage Ratio was 3.89 to 1.00 which exceeded the 2.75 to 1.00 limit imposed by the Secured Credit Facilities and constituted a default. The Excess Account Concentration covenant permits the U. S. Lenders and the International Lender to increase the interest rates by 2.0% if, as of the last day of any fiscal quarter, either (a) the accounts receivable from any country not listed as a Permitted Country as defined in the Secured Credit Facilities (other than the United Arab Emirates) that are more than 120 days old (relative to the invoice date) constitute more than 10% of the total outstanding accounts receivable or (b) accounts receivable from any individual client located in the United Arab Emirates that are more than 120 days old (relative to the invoice date) constitute more than 14% of the total outstanding accounts receivable. The interest rate will be reset as soon as the accounts receivable over 120 days decline below the 10% or 14% levels. In anticipation of the event of default upon delivery of the quarterly compliance certificate, the Company requested a waiver from the Agent. On March 27, 2017, the Company obtained the waiver of the Consolidated Net Leverage Ratio default. In connection with the waiver, the Company incurred a consent fee amounting to approximately $401,000 which will be charged to interest expense in the first quarter of 2017. The U.S. Credit Facilities are guaranteed by certain U.S. subsidiaries of the Company, and the International Revolver is guaranteed by the Company and certain of the Company's U.S. and non-U.S. subsidiaries. Term Loan Facility The interest rate on the Term Loan Facility will be, at the Company's option, either: • the London Inter-Bank Offered Rate ("LIBOR") for the relevant interest period plus 6.75% per annum, provided that such LIBOR shall not be lower than 1.00% per annum; or • the Base Rate (as described below) plus 5.75% per annum. The "Base Rate" is a per annum rate equal to the highest of (A) the prime rate, (B) the federal funds effective rate plus 0.50%, or (C) the LIBOR for an interest period of one month plus 1.0% per annum. Upon a default, the applicable rate of interest under the Secured Credit Facilities may increase by 2.0%. The LIBOR on the Term Loan Facilities (including when determining the Base Rate) shall in no event be less than 1.0% per annum. At December 31, 2016, the interest rate on the Term Loan was 7.75% The Company has the right to prepay the Term Loan Facility in full or in part at any time without premium or penalty. The Company is required to make mandatory prepayments of the Term Loan Facility, without premium or penalty, (i) with net proceeds of any issuance or incurrence of indebtedness (other than that permitted under the Term Loan Facility) by the Company, (ii) with net proceeds from certain asset sales outside the ordinary course of business, and (iii) with 50% of the excess cash flow (as defined in the agreement) for each fiscal year of the Borrowers commencing with the year ending December 31, 2016 (which percentage would be reduced to 25% if the Consolidated Net Leverage Ratio is equal to or less than 2.25 to 1.00 or reduced to 0% if the Consolidated Net Leverage Ratio is equal to or less than 1.50 to 1.00). The Term Loan Facility is generally secured by a first-priority security interest in substantially all assets of the Company and certain of the Company's U.S. subsidiaries other than accounts receivable, cash proceeds thereof and certain bank accounts, as to which the Term Loan Facility is secured by a second-priority security interest. The Term Loan Facility has a term of six years, requires repayment of 0.25% of the original principal amount on a quarterly basis through September 30, 2020, the maturity date. Any amounts repaid on the Term Loan Facility will not be available to be re-borrowed. The Company incurred fees and expenses related to the Term Loan Facility aggregating $7,066,000 which were deferred. The deferred fees are being amortized on a straight-line basis, which approximates the effective interest method, to interest and related financing fees, net over a six-year period which ends on September 30, 2020. Unamortized balances of $4,416,000 and $5,594,000 are reflected as reductions of the term loan in the consolidated balance sheets at December 31, 2016 and 2015, respectively. Revolving Credit Facilities The interest rate on borrowings under the U.S. Revolver will be, at the Company's option from time to time, either the LIBOR for the relevant interest period plus 3.75% per annum or the Base Rate plus 2.75% per annum. At December 31, 2016 the interest rate was 6.50%. The interest rate on borrowings under the International Revolver will be the European Inter-Bank Offered Rate, or "EURIBOR," for the relevant interest period (or at a substitute rate to be determined to the extent EURIBOR is not available) plus 4.00% per annum. At December 31, 2016 the interest rate was 4.38%. The Company will pay a commitment fee calculated at 0.50% annually on the average daily unused portion of the U.S. Revolver, and the Subsidiary will pay a commitment fee calculated at 0.75% annually on the average daily unused portion of the International Revolver. The ability to borrow under each of the U.S. Revolver and the International Revolver is subject to a "borrowing base," calculated using a formula based upon approximately 85% of receivables that meet or satisfy certain criteria ("Eligible Receivables") and that are subject to a perfected security interest held by either the U.S. Lenders or the International Lender, plus, in the case of the International Revolver only, 10% of Eligible Receivables that are not subject to a perfected security interest held by the International Lender, subject to certain exceptions and restrictions. The Company or the Subsidiary, as applicable, will be required to make mandatory prepayments under their respective Revolving Credit Facilities to the extent that the aggregate outstanding amount thereunder exceeds the then-applicable borrowing base, which payments will be made without penalty or premium. At December 31, 2016, the domestic borrowing base was $30,000,000 and the international borrowing base was €11,765,000 (approximately $12,380,000 at December 31, 2016). Generally, the obligations of the Company under the U.S. Revolver are secured by a first-priority security interest in the above-referenced accounts receivable, cash proceeds and bank accounts of the Company and certain of the Company's U.S. subsidiaries, and a second-priority security interest in substantially all other assets of the Company and such subsidiaries. The obligations of the Subsidiary under the International Revolver would generally be secured by a first-priority security interest in substantially all accounts receivable, cash proceeds thereof and certain bank accounts of the Subsidiary and certain of the Company's non-U.S. subsidiaries, and a second-priority security interest in substantially all other assets of the Company and certain of the Company's U.S. and non-U.S. subsidiaries. The Revolving Credit Facilities have a term of five years and require payment of interest only during the term. Under the Revolving Credit Facilities, outstanding loans may be repaid in whole or in part at any time, without premium or penalty, subject to certain customary limitations, and will be available to be re-borrowed from time to time through expiration on September 30, 2019. The Company incurred fees and expenses related to the Revolving Credit Facilities aggregating $3,000,000 which was deferred. The deferred fees are being amortized on a straight-line basis, which approximates the effective interest method, to interest expense and related financing fees, net over a five-year period which ends on September 30, 2019. Unamortized balances of $1,650,000 and $2,250,000 are included in other assets in the consolidated balance sheet at December 31, 2016 and 2015, respectively. At December 31, 2016, the Company had $4,519,000 of outstanding letters of credit and $8,981,000 of available borrowing capacity under the U.S. Revolver. At December 31, 2016, the Company had $945,000 of outstanding letters of credit and $4,195,000 of available borrowing capacity under the International Revolver and its other foreign credit agreements (See "Other Debt Arrangements" below for more information). Other Debt Arrangements In connection with the 2015 move of its corporate headquarters to Philadelphia, Pennsylvania, the Company received a loan from the Philadelphia Industrial Development Corporation in the amount of $750,000 which bears interest at 2.75%, is repayable in 144 equal monthly installments of $6,121 and matures on May 1, 2027. The Company's subsidiary, Hill International (Spain) S.A. ("Hill Spain"), maintained a revolving credit facility with six banks (the "Financing Entities") in Spain which initially provided for total borrowing of up to €5,640,000 with interest at 6.50% on outstanding borrowings. The facility expired on December 17, 2016. Concurrent with the satisfaction of this facility Hill Spain entered into a new agreement with three new banks. The total new facility is for €2,770,000 (approximately $2,915,000) at December 31, 2016. The facility was fully utilized at December 31, 2016. Interest rates at December 31, 2016 were between 1.85% and 3.50%. The loans have varying expiration dates between 36 and 60 months. Hill Spain also maintains an ICO (Official Credit Institute) loan with Bankia Bank in Spain for €45,000 (approximately $47,355) at December 31, 2016. The availability is reduced by €15,000 on a quarterly basis. At December 31, 2016, the loan was fully utilized with total borrowings outstanding of €45,000 (approximately $47,355). The interest rate at December 31, 2016 was 6.50%. The ICO loan expires on August 10, 2017. The Company maintains a credit facility with the National Bank of Abu Dhabi which provides for total borrowings of up to AED 11,500,000 (approximately $3,131,000 at December 31, 2016) collateralized by certain overseas receivables. At December 31, 2016, there were no borrowings outstanding. The interest rate is the one-month Emirates InterBank Offer Rate plus 3.00% (or 4.41% at December 31, 2016) but no less than 5.50%. This facility allow for up to AED 200,000,000 (approximately $54,451,000 at December 31, 2016) of which AED 127,377,000 (approximately $34,686,000) was outstanding at December 31, 2016. The credit facility is subject to periodic review by the bank. Engineering S.A. maintains four unsecured revolving credit facilities with two banks in Brazil aggregating 2,380,000 Brazilian Reais (BRL) (approximately $732,000 at December 31, 2016), with a weighted average interest rate of 5.09% per month at December 31, 2016. There were no borrowings outstanding on any of these facilities which are renewed automatically every three months. The Company also maintains relationships with other foreign banks for the issuance of letters of credit, letters of guarantee and performance bonds in a variety of foreign currencies. At December 31, 2016, the maximum U.S. dollar equivalent of the commitments was $83,382,000 of which $38,680,000 is outstanding. At December 31, 2016, contractually scheduled maturities of long term debt were as follows (in thousands): Years Ending December 31, 2017 $ 2018 2019 2020 2021 Thereafter ​ ​ ​ ​ ​ Total $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2016
Supplemental Cash Flow Information
Supplemental Cash Flow Information	Note 12—Supplemental Cash Flow Information The Company issues shares of its common stock and deferred stock units to its non-employee directors as partial compensation for services on the Company's Board through the next annual stockholders meeting. See Note 13 for further information with respect to this plan. Other activity is provided in the following table (in thousands): Years Ended December 31, 2016 2015 2014 Interest and related financing fees paid $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Income taxes paid $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Increase in property and equipment from a tenant improvement allowance related to the relocation of the corporate headquarters $ — $ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Reduction of noncontrolling interest in connection with acquisitions of additional interests in Engineering S.A. $ — $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Increase in additional paid in capital from issuance of shares of common stock in connection with the acquisition of an additional interest in ESA $ — $ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Decrease in additional paid-in capital related to ESA Put Options $ ) $ — $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Increase in additional paid in capital from issuance of shares of common stock related to purchase of CPI $ — $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Increase in additional paid in capital from issuance of shares of common stock from cashless exercise of stock options $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2016
Share-Based Compensation
Share-Based Compensation	Note 13—Share-Based Compensation 2009 Non-Employee Director Stock Grant Plan The 2009 Non-Employee Director Stock Grant Plan covers 400,000 shares of the Company's common stock. Awards under the plan may take the form of share of the Company's common stock or deferred stock units ("DSU") which entitle the participants to receive one share of common stock for each DSU upon retirement from the Board of directors. Only the Company's Non-Employee Directors are eligible to receive awards under the plan. Information with respect to the plan's activity follows (in thousands): Years Ended 2016 2015 2014 Shares issued Compensation expense $ $ $ Deferred stock units issued — — Compensation expense $ $ — $ — 2008 Employee Stock Purchase Plan The Employee Stock Purchase Plan covers 2,000,000 shares of the Company's common stock. Eligible employees may purchase shares at 85% of the fair market value on the date of purchase. Information with respect to the plan's activity follows (in thousands): Years Ended 2016 2015 2014 Shares purchased Aggregate purchase price $ $ $ Compensation expense $ $ $ 2006 Employee Stock Option Plan The 2006 Employee Stock Option Plan, as amended, covers 10,000,000 shares of the Company's common stock. Under its terms, directors, officers and employees of the Company and its subsidiaries are eligible to receive non-qualified and incentive stock options. Options granted to non-employee directors vest immediately and have a five year contractual term. Options granted to officers and employees vest over five years and have a seven-year contractual term. Generally, each option has an exercise price equal to the closing quoted market price of a share of the Company's common stock on the date of grant. For grants of incentive stock options, if the grantee owns, or is deemed to own, 10% or more of the total voting power of the Company, then the exercise price shall be 110% of the closing quoted market price on the date of grant and the option will have a five-year contractual term. Options that are forfeited or expire are available for future grants. At December 31, 2016, a total of 1,643,000 shares of common stock were reserved for future issuance under the plan. The Black-Scholes option valuation model is used to estimate the fair value of the options. The following table summarizes the fair value of options granted during 2016, 2015 and 2014 and the assumptions used to estimate the fair value: December 31, 2016 2015 2014 Average expected life (years) Forfeiture range % 0 - 5.0 % 0 - 5.0 % Weighted average forfeiture rate % % % Dividends % % % Volatility range 47.4 - 57.5 % 46.9 - 59.9 % 61.5 - 65.5 % Weighted average volatility % % % Range of risk-free interest rates 0.97 - 1.46 % 1.07 - 1.61 % 0.86 - 1.74 % Weighted average risk-free interest rate % % % Weighted average fair value at grant date $ $ $ The expected term of the options is estimated based on the "simplified method" as permitted by SAB No. 110. Expected volatility was calculated using the average historical volatility of the Company. The risk-free interest rate is based on U.S. Treasury yields for securities in effect at the time of grants with terms approximating the term of the grants. The assumptions used in the Black-Scholes option valuation model are highly subjective, particularly as to stock price volatility of the underlying stock, which can materially affect the resulting valuation. A summary of the Company's stock option activity and related information for the years ended December 31, 2016, 2015 and 2014 is as follows (in thousands, except exercise price and remaining life data): Options Weighted Weighted Aggregate Outstanding, December 31, 2013 $ Granted Exercised ) Expired ) Forfeited ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Outstanding, December 31, 2014 Granted Exercised ) Expired ) Forfeited ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Outstanding, December 31, 2015 Granted Exercised ) Expired ) Forfeited ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Outstanding, December 31, 2016 $ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Exercisable, December 31, 2016 $ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Aggregate intrinsic value represents the difference between the exercise prices and the closing stock price on December 31, 2016. At December 31, 2016, the weighted average exercise price of the outstanding options was $4.45 and the closing stock price was $4.35. For various price ranges, weighted average characteristics of outstanding stock options at December 31, 2016 are as follows: Options Outstanding Options Exercisable Exercise Prices Number Weighted Weighted Number Weighted $2.85 $ $ 2.89 3.00 3.12 3.35 — 3.46 3.55 3.67 3.91 3.95 4.00 — 4.03 4.04 4.31 — 4.35 4.46 — 4.84 4.90 4.95 5.00 — 5.17 — 5.31 5.47 5.73 5.83 6.31 6.61 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ In the years ended December 31, 2016, 2015 and 2014, the Company recorded share-based compensation related to stock options of approximately $2,436,000, $2,960,000 and $3,292,000, respectively, which is included in selling, general and administrative expenses. The following table summarizes the Company's non-vested stock option activity and related information for the years ended December 31, 2016, 2015 and 2014 (in thousands, except weighted average grant date fair value): Options Weighted Non-vested options at December 31, 2013 Granted Vested ) Forfeited ) ​ ​ ​ ​ ​ ​ ​ ​ Non-vested options at December 31, 2014 Granted Vested ) Forfeited ) ​ ​ ​ ​ ​ ​ ​ ​ Non-vested options at December 31, 2015 Granted Vested ) Forfeited ) ​ ​ ​ ​ ​ ​ ​ ​ Non-vested options at December 31, 2016 $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ At December 31, 2016, total unrecognized compensation cost related to non-vested options was $4,546,000 which will be recognized over the remaining weighted-average service period of 1.91 years.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2016
Stockholders' Equity
Stockholders' Equity	Note 14—Stockholders' Equity During the year ended December 31, 2016, the Company received cash proceeds of $351,000 from the exercise of stock options. During 2016, certain officers exercised 320,745 options with an exercise price of $2.45 through the Company. The Company withheld 233,752 shares as payment for the options and placed those shares in treasury. The officers received 87,713 shares from these transactions. During May 2015, four of the Company's directors exercised an aggregate of 84,868 options with an exercise price of $4.25 through the Company on a cashless basis. The Company withheld 67,400 shares as payment for the options and placed those shares in treasury. The directors received a total of 17,468 shares from this transaction. In April 2015, two shareholders who owned approximately 19% of ESA exercised their ESA Put Options. On August 12, 2015, the Company paid the $4,374,000 liability with 924,736 shares of its common stock, of which it repurchased 129,648 shares for an aggregate price of $580,000. See Note 5 for further information. On August 6, 2014, in connection with the Refinancing (See Note 11), the Company sold 9,546,629 shares of its common stock in an underwritten equity offering and received net proceeds aggregating approximately $38,078,000, of which two mandatory prepayments of $9,522,402 were used to pay down the 2012 Term Loan Agreement and the 2009 Revolving Credit Agreement. In March 2014, the Company's former Chairman and Chief Executive Officer exercised 200,000 options with an exercise price of $2.70 through the Company on a cashless basis. The Company withheld 112,788 shares as payment for the options and placed those shares in treasury. The Chairman and Chief Executive Officer received 87,212 shares from this transaction. We have an effective registration statement on Form S-3 on file with the U.S. Securities and Exchange Commission (the "SEC") which registered 20,000,000 shares of our common stock for issuance and sale by us at various times in the future. The proceeds, if any, will be used for working capital and general corporate purposes, subject to the restrictions of our Secured Credit Facilities. We have an effective registration statement on Form S-4 on file with the SEC which registered 20,000,000 shares of our common stock, which includes 6,438,923 shares of our common stock registered under a previous Form S-4, for use in future acquisitions. During 2013, we issued 1,389,769 shares in connection with our acquisitions of BCA and CPI. During 2014, we issued 171,308 shares in connection with certain additional consideration for CPI. In 2015, we issued 148,460 shares of our common stock for additional consideration for CPI. See Note 5 for further information.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2016
Income Taxes
Income Taxes	Note 15—Income Taxes The effective tax rates for the years ended December 31, 2016, 2015 and 2014 were (392.3%), 37.9% and 35.1% respectively. For all the years presented, the Company's effective tax rate is significantly higher than the U.S. federal statutory rate primarily as a result of various foreign withholding taxes and the inability to record an income tax benefit related to the U.S. net operating loss. In 2014, the effective tax rate was favorably impacted by a reversal of approximately $2,500,000 for uncertain tax positions based on management's assessment that those items were effectively settled with a foreign jurisdiction. The components of earnings before income taxes by United States and foreign jurisdictions were as follows (in thousands): Years Ended December 31, 2016 2015 2014 United States $ ) $ ) $ ) Foreign jurisdictions ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ ) $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Income tax expense (benefit) consists of the following (in thousands): Current Deferred Total Year ended December 31, 2016: U.S. federal $ — $ — $ — State and local — — — Foreign jurisdictions ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ $ ) $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2015: U.S. federal $ — $ — $ — State and local — — — Foreign jurisdictions ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ $ ) $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2014: U.S. federal $ — $ — $ — State and local — — — Foreign jurisdictions ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ $ ) $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The decrease in tax expense in 2016 compared to 2015 results from the mix of income and tax rates in various foreign jurisdictions The decrease in tax expense in 2015 compared to 2014 results from the mix of income and tax rates in various foreign jurisdictions. In 2014, approximately $2,500,000 of reversal for uncertain tax positions was recorded based on management's assessment that those items were effectively settle with a foreign jurisdiction. The differences between income taxes based on the statutory U.S. federal income tax rate and the Company's effective income tax rate are provided in the following reconciliation (in thousands). Years Ended December 31, 2016 2015 2014 Statutory federal income tax $ ) $ $ Foreign tax benefit for earnings taxed at lower rates ) ) Change in the valuation allowance Valuation allowance—discontinued operations NOL adjustment ) ) ) Net liability (reductions) additions for uncertain tax positions ) ) Excess compensation State and local income taxes, net of federal income tax benefit ) ) ) Stock options Purchase accounting reversal — — ) Other ) ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The tax effect of temporary differences that give rise to deferred tax assets and deferred tax liabilities are as follows (in thousands): December 31, 2016 2015 Deferred tax assets: Net operating loss carry forward—U.S. operations $ $ Amortization of intangibles Net operating loss carry forward—foreign operations Compensated absences Foreign income taxes on currency translation Share based compensation Allowance for uncollectible accounts Bonus accrual — Foreign tax credit Other ​ ​ ​ ​ ​ ​ ​ ​ Total gross deferred tax assets Valuation allowances ) ) ​ ​ ​ ​ ​ ​ ​ ​ Net deferred tax assets ​ ​ ​ ​ ​ ​ ​ ​ Deferred tax liabilities: Intangible assets ) ) Depreciation ) ) Prepaid expenses ) ) Change in tax method ) ) Accrued expenses ) — ​ ​ ​ ​ ​ ​ ​ ​ Total gross deferred tax liabilities ) ) ​ ​ ​ ​ ​ ​ ​ ​ Net deferred tax assets $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The deferred taxes have been reflected in the balance sheet based on tax jurisdiction as follows: Deferred tax asset $ $ Deferred tax liability ) ) ​ ​ ​ ​ ​ ​ ​ ​ Net deferred tax assets $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities and projected future taxable income in making this assessment. Management evaluates the need for valuation allowances on the deferred tax assets according to the provisions of ASC 740, Income Taxes. They consider both positive and negative evidence. In making this determination, management assesses all of the evidence available at the time including recent earnings, internally-prepared income projections, and historical financial performance. Due to recurring net operating losses in the United States, management has determined that it is more likely than not that the Company will not be able to utilize its U.S. deferred tax assets. The Company continues to generate U.S. net operating losses and recorded additional valuation allowances of $1,317,000 and $7,583,000 at December 31, 2016 and 2015, respectively. U.S. valuation allowances of $50,987,000 and $49,670,000 were recorded at December 31, 2016 and 2015, respectively, primarily related to the U.S. net operating loss carryforwards. As a result, the U.S. deferred tax assets, net of U.S. deferred tax liabilities, are fully reserved at December 31, 2016. Cumulative U.S. federal and state net operating losses at December 31, 2016 are $132,331,000 and $135,234,000, respectively. At December 31, 2016 and 2015, there were approximately $36,256,000 and $27,571,000, respectively, of gross foreign net operating loss carry forwards. The majority of these net operating loss carry forwards have an unlimited carry forward period. It is anticipated that these losses will not be utilized due to continuing losses in these jurisdictions. Foreign valuation allowances of $21,167,000 and $16,373,000 were recorded at December 31, 2016 and 2015, respectively, primarily related to the foreign allowance for doubtful accounts in connection with the Libya Receivable reserve and the foreign net operating loss carry forwards. In 2016, $2,424,000 of the valuation allowance is recorded to Accumulated Other Comprehensive Income and is related to the deferred tax asset recorded as a foreign exchange adjustment related to long term notes payable. The Company has made no provision for U.S. taxes on $128,175,000 of cumulative earnings of foreign subsidiaries as those earnings are intended to be reinvested for an indefinite period of time and are not intended to be distributed to the U.S. Upon distribution of these earnings in the form of dividends or otherwise, the Company may be subject to U.S. income taxes and foreign withholding taxes. It is not practical, however, to estimate the amount of taxes that may be payable on the eventual repatriation of these earnings. The Company will recognize a tax benefit in the financial statements for an uncertain tax position only if management's assessment is that the position is "more likely than not" (i.e., a likelihood greater than 50 percent) to be allowed by the tax jurisdiction based solely on the technical merits of the position. The term "tax position" refers to a position in a previously filed tax return or a position expected to be taken in a future tax return that is reflected in measuring current or deferred income tax assets and liabilities for financial reporting purposes. The following table indicates the changes to the Company's uncertain tax positions for the years ended December 31, 2016 and 2015 including interest and penalties (in thousands): Years Ended 2016 2015 Balance, beginning of year $ $ Reductions based on tax positions related to prior years ) ) Reduction due to settlements with taxing authorities ) ) Additions based on tax positions related to prior years ​ ​ ​ ​ ​ ​ ​ ​ Balance, end of year $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The Company files income tax returns in the U.S. federal jurisdiction and in various state and foreign jurisdictions. The Company generally is no longer subject to U.S. or state examinations by tax authorities for taxable years prior to 2013. However, net operating losses utilized from prior years in subsequent years' tax returns are subject to examination until three years after the filing of subsequent years' tax returns. The statute of limitations expiration in foreign jurisdictions for corporate tax returns generally ranges between two and five years depending on the jurisdiction. The Company's policy is to record income tax related interest and penalties in income tax expense. At December 31, 2016, 2015 and 2014, the Company has accrued $206,000, $500,000 and $520,000, respectively, related to potential interest and penalties. The Company's income tax returns are based on calculations and assumptions that are subject to examinations by the Internal Revenue Service and other tax authorities. While the Company believes it has appropriate support for the positions taken on its tax returns, the Company regularly assesses the potential outcomes of these examinations and any future examinations for the current or prior years in determining the adequacy of its provision for income taxes. As part of its assessment of potential adjustments to its tax returns, the Company increases its current tax liability to the extent an adjustment would result in a cash tax payment or decreases its deferred tax assets to the extent an adjustment would not result in a cash tax payment. The Company continually assesses the likelihood and amount of potential adjustments and adjusts the income tax provision, the current tax liability and deferred taxes in the period in which the facts that give rise to a revision become known.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies
Commitments and Contingencies	Note 16—Commitments and Contingencies General Litigation In 2013, M.A. Angeliades, Inc. ("Plaintiff") filed a complaint with the Supreme Court of New York against the Company and the New York City Department of Design and Construction ("DDC") regarding payment of approximately $8,771,000 for work performed as a subcontractor to the Company plus interest and other costs. On October 5, 2015, pursuant to a settlement agreement, Hill paid Plaintiff approximately $2,596,000, including interest amounting to $1,056,000, of which $448,000 had been previously accrued and $608,000 was charged to expense for the year ended December 31, 2015. The remaining issues regarding Plaintiff's requests for change orders and compensation for delay are being negotiated between Plaintiff and the DDC. In 2014, a former executive of the Company ("Plaintiff") resigned and filed a labor dispute with the Company in the Dubai Labour Court seeking AED 4,536,239 (approximately $1,210,000) for end of service remuneration. The Company filed a counterclaim against Plaintiff for breach of employment contract and filed a complaint against Plaintiff's new employer, Driver Group plc, in the UK for breach of non-solicitation and non-compete obligations in Plaintiff's employment agreement. On June 15, 2015, the Company paid Plaintiff AED 750,000 (approximately $200,000) pursuant to an executed settlement agreement. During year ended December 31, 2015, the Company recorded an additional $100,000 associated with the settlement payment and $834,000 of related legal costs. Knowles Limited ("Knowles"), a subsidiary of the Company, is a party to an arbitration proceeding instituted on July 8, 2014 in which Knowles claimed that it was entitled to payment for services rendered to Celtic Bioenergy Limited ("Celtic"). The arbitrator decided in favor of Knowles. The arbitrator's award was appealed by Celtic to the U.K. High Court of Justice, Queen's Bench Division, Technology and Construction Court ("Court"). On March 16, 2017, the Court (1) determined that certain relevant facts had been deliberately withheld from the arbitrator by an employee of Knowles and (2) remitted the challenged parts of the arbitrator's award back to the arbitrator to consider the award in possession of the full facts. The Company is evaluating the impact of the judgment of the Court. From time to time, the Company is a defendant or plaintiff in various legal actions which arise in the normal course of business. As such the Company is required to assess the likelihood of any adverse outcomes to these matters as well as potential ranges of probable losses. A determination of the amount of the provision required for these commitments and contingencies, if any, which would be charged to earnings, is made after careful analysis of each matter. The provision may change in the future due to new developments or changes in circumstances. Changes in the provision could increase or decrease the Company's earnings in the period the changes are made. It is the opinion of management, after consultation with legal counsel, that the ultimate resolution of these matters will not have a material adverse effect on the Company's financial condition, results of operations or cash flows. Off-Balance Sheet Arrangements The Company enters into agreements with banks for the banks to issue bonds to clients or potential clients for three separate purposes as follows: (1) Certain of the Company's subsidiaries (Hill International N.V., Hill International (UK) Ltd. and Hill International (Middle East) Ltd.) have entered into contracts for the performance of construction management services which provide that the Company receive advance payment of some of the management fee from the client prior to commencement of the construction project. However, the clients require a guarantee of service performance in the form of an advance payment bond. These bonds are evidenced by Letters of Guarantee issued by the subsidiaries' banks in favor of the clients. In some cases these clients also require a parent company guarantee. (2) The Company may also enter into certain contracts which require a performance bond to be issued by a bank in favor of the client for a portion of the value of the contract. These bonds may be exercised by the client in instances where the Company fails to provide the contracted services. (3) Certain clients may require bonds as part of the bidding process for new work. The bid bonds are provided to demonstrate the financial strength of the companies seeking the work and are usually outstanding for short periods. If the bid is rejected the bond is cancelled and if the bid is accepted the Company may be required to provide a performance bond. The maximum potential future payment under these arrangements at December 31, 2016 was $105,377,000. Cash held in restricted accounts as collateral for the issuance of performance and advance payment bonds and letters of credit at December 31, 2016 and 2015 were $4,625,000 and $4,694,000, respectively. Acquisition-Related Contingencies As of December 31, 2016 our subsidiary, Hill International (Spain), S.A. ("Hill Spain"), owned an indirect 91% interest in Engineering S.A. ("ESA"), a firm located in Brazil. ESA's shareholders entered into an agreement whereby the minority shareholders have a right to compel ("ESA Put Option") Hill Spain to purchase any or all of their shares during the period from February 28, 2014 to February 28, 2021. Hill Spain also has the right to compel ("ESA Call Option") the minority shareholders to sell any or all of their shares during the same time period. The purchase price for such shares shall be seven times the earnings before interest and taxes for ESA's most recently ended fiscal year, net of any financial debt plus excess cash multiplied by a percentage which the shares to be purchased bear to the total number of shares outstanding at the time of purchase, but in the event the ESA Call Option is exercised by Hill Spain, the purchase price shall be increased by five percent. The ESA Put Option and the ESA Call Option must be made within three months after the audited financial statements of ESA have been completed. On June 17, 2016, the three remaining minority shareholders exercised their ESA Put Options claim a value of BRL 8,656,000 (approximately $2,659,000 at December 31, 2016). The Company accrued the liability which is included in other current liabilities and as an adjustment to additional paid in capital in the consolidated balance sheet at December 31, 2016. The amount is subject to negotiation and any difference will be recorded upon completion of the transaction. See Note 5. The Company accrued approximately TRY 6,100,000 ($2,088,000) for potential future payments in connection with the acquisition of IMS. IMS's EBITDA through the one-year anniversary of the acquisition date was not sufficient to earn any of the Additional Purchase Price and the liability was eliminated by a credit of approximately $673,000 to selling, general and administrative expenses at December 31, 2016. See Note 5. Other The Company has identified a potential tax liability related to certain foreign subsidiaries' failure to comply with laws and regulations of the jurisdictions, outside of their home country, in which their employees provided services. The Company has estimated the potential liability to be approximately $2,106,000 and has reflected that amount in discontinued operations in the consolidated statement of operations for the year ended December 31, 2016 and in other liabilities in the consolidated balance sheet at December 31, 2016.

Operating Leases

Operating Leases	12 Months Ended
	Dec. 31, 2016
Operating Leases
Operating Leases	Note 17—Operating Leases The Company has numerous operating leases which have various expiration dates through December, 2027. Rent expense was approximately $9,208,000, $8,724,000 and $8,416,000 for the years ended December 31, 2016, 2015 and 2014, respectively, which is included in selling, general and administrative expenses in the consolidated statements of earnings. The Company is required to pay property taxes, utilities and other costs related to several of its leased office facilities. At December 31, 2016, approximate future minimum payments under these leases that have remaining non-cancelable lease terms in excess of one year are as follows (in thousands): Years Ending December 31, 2017 $ 2018 2019 2020 2021 Thereafter ​ ​ ​ ​ ​ Total $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2016
Benefit Plans
Benefit Plans	Note 18—Benefit Plans The Company maintains a 401(k) Retirement Savings Plan (the "401(k) Plan") for qualified employees. The terms of the 401(k) Plan define qualified employees as those over 21 years of age. The Company matches 50% of employee contributions up to 2% of employee compensation up to a maximum $2,650. For the years ended December 31, 2016, 2015 and 2014, the Company recognized expense amounting to $1,005,000, $905,000 and $801,000, respectively, which is included in selling, general and administrative expenses in the consolidated statements of earnings.

Segment and Related Information

Segment and Related Information	12 Months Ended
	Dec. 31, 2016
Segment and Related Information
Segment and Related Information	Note 19—Segment and Related Information At December 31, 2016, due to the pending sale of our Construction Claims Group, the Company now has one operating segment, the Project Management Group, which reflects how the Company will be managed going forward. The Project Management Group provides extensive construction and project management services to construction owners worldwide. Such services include program management, project management, construction management, project management oversight, troubled project turnaround, staff augmentation, project labor agreement consulting, commissioning, estimating and cost management, labor compliance services and facilities management services. The information for 2015 and 2014 has been revised to exclude the operations of the Construction Claims Group which is accounted for as discontinued operations. The following tables present certain information for the Project Management Group's operations (in thousands): Consulting Fee Revenue by Geographic Region 2016 2015 2014 United States $ % $ % $ % Latin America Europe Middle East Africa Asia/Pacific ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ % $ % $ % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, 2016, consulting fee revenue from the United Arab Emirates amounted to $70,834,000 representing 16.3% of the total and Saudi Arabia amounted to $47,783,000 representing 11.0% of the total. No other country except for the United States accounted for over 10% of consulting fee revenue. For the year ended December 31, 2015, consulting fee revenue from the United Arab Emirates amounted to $86,327,000 representing 18.5% of the total, Saudi Arabia amounted to $53,348,000 representing 11.4% of the total and Oman amounted to $54,243,000 representing 11.6% of the total. No other country except for the United States accounted for over 10% of consulting fee revenue. For the year ended December 31, 2014, consulting fee revenue from the United Arab Emirates amounted to $48,713,000 representing 11.4% of the total, Oman amounted to $62,337,000 representing 14.5% of the total and Saudi Arabia amounted to $48,259,000 representing 11.3% of the total. No other country except for the United States accounted for over 10% of consulting fee revenue. Total Revenue by Geographic Region 2016 2015 2014 United States $ % $ % $ % Latin America Europe Middle East Africa Asia/Pacific ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ % $ % $ % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ For the year ended December 31, 2016, total revenue from the United Arab Emirates amounted to $75,641,000 representing 14.5% of the total. No other country except for the United States accounted for over 10% of total revenue. For the year ended December 31, 2015, total revenue from the United Arab Emirates amounted to $89,618,000 representing 16.2% of the total and total revenue from Oman amounted to $58,390,000 representing 10.6% of the total. No other country except for the United States accounted for over 10% of total revenue. For the year ended December 31, 2014, total revenue from the United Arab Emirates amounted to $49,855,000 representing 10.2% of the total, Oman amounted to $66,175,000 representing 13.6% of the total and Saudi Arabia amounted to $48,919,000 representing 10.0% of the total. No other country except for the United States accounted for over 10% of total revenue. Operating Profit (Loss) 2016 2015 2014 United States $ $ $ Latin America ) Europe ) ) ) Middle East Africa Asia/Pacific Corporate ) ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ ) $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Depreciation and Amortization Expense 2016 2015 2014 Project Management $ $ $ Corporate ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consulting Fee Revenue By Client Type 2016 2015 2014 U.S. federal government $ % $ % $ % U.S. state, regional and local governments Foreign governments Private sector ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ % $ % $ % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Revenue By Client Type 2016 2015 2014 U.S. federal government $ % $ % $ % U.S. state, regional and local governments Foreign governments Private sector ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ % $ % $ % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Property, Plant and Equipment, Net by Geographic Location December 31, 2016 2015 United States $ $ Latin America Europe Middle East Africa Asia/Pacific ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Schedule II Valuation and Quali

Schedule II Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2016
Schedule II Valuation and Qualifying Accounts
Schedule II Valuation and Qualifying Accounts	Schedule II Hill International, Inc. and Subsidiaries Valuation and Qualifying Accounts (Allowance for Uncollectible Receivables—in thousands) Balance at Additions Other—Allowance Uncollectible Balance at Fiscal year ended December 31, 2016 $ $ $ — $ ) $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fiscal year ended December 31, 2015 $ $ $ $ ) $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Fiscal year ended December 31, 2014 $ $ ) $ — $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Summary of Significant Accoun28

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
Summary of Significant Accounting Policies
Basis of Presentation and Principles of Consolidation	(a) Basis of Presentation and Principles of Consolidation The accompanying consolidated financial statements were prepared in accordance with accounting principles generally accepted in the United States ("GAAP"). The consolidated financial statements include the accounts of Hill International, Inc. and its majority owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Foreign Currency Translations and Transactions	(b) Foreign Currency Translations and Transactions Assets and liabilities of all foreign operations are translated at year-end rates of exchange while revenues and expenses are translated at the average monthly exchange rates. Gains or losses resulting from translating foreign currency financial statements are accumulated in a separate component of stockholders' equity entitled accumulated other comprehensive loss until the entity is sold or substantially liquidated. Gains or losses arising from foreign currency transactions (transactions denominated in a currency other than the entity's local currency) are reflected in selling, general and administrative expenses in the consolidated statement of operations.
Use of Estimates and Assumptions	(c) Use of Estimates and Assumptions The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of certain assets and liabilities and the revenue and expenses reported for the periods covered by the financial statements and certain amounts disclosed in the accompanying notes to the consolidated financial statements. Actual results could differ significantly from those estimates and assumptions. The estimates affecting the consolidated financial statements that are particularly significant include revenue recognition, allocation of purchase price to acquired intangibles and goodwill, fair value of contingent consideration, recoverability of long-lived assets, income taxes, allowance for doubtful accounts and commitments and contingencies.
Fair Value Measurements	(d) Fair Value Measurements The fair value of financial instruments, which primarily consists of cash and cash equivalents, accounts receivable and accounts payable, approximates carrying value due to the short-term nature of the instruments. The carrying value of our various credit facilities approximates fair value as the interest rate is variable. Fair value is the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining fair value, the Company considers the principal or most advantageous market in which it would transact, and the Company considers assumptions that market participants would use when pricing the asset or liability. Nonfinancial assets and liabilities, such as goodwill and long lived assets that are initially recorded at fair value, will be assessed for impairment, if deemed necessary. During the years ended December 31, 2016 and 2015, the Company did not record any impairment to any financial or nonfinancial assets or liabilities.
Cash and Cash Equivalents	(e) Cash and Cash Equivalents Cash and cash equivalents include cash on hand and investments in money market funds and investment grade securities held with high quality financial institutions. The Company considers all highly liquid instruments purchased with a remaining maturity of three months or less at the time of purchase to be cash equivalents.
Restricted Cash	(f) Restricted Cash Restricted cash represents cash collateral required to be maintained in foreign bank accounts to serve as collateral for letters of credit, bonds or guarantees on several projects. The cash will remain restricted until the respective project has been completed, which typically is greater than one year.
Concentrations of Credit Risk	(g) Concentrations of Credit Risk Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash investments and accounts receivable. The Company maintains its cash accounts with high quality financial institutions. Although the Company currently believes that the financial institutions, with which it does business, will be able to fulfill their commitments to it, there is no assurance that those institutions will be able to continue to do so. The Company provides professional services, under contractual arrangements, to domestic and foreign governmental units, institutions and the private sector. To reduce credit risk, the Company performs ongoing credit evaluations of its clients and does not require collateral beyond customary retainers. The following tables show the number of the Company's clients which contributed 10% or more of total revenue and accounts receivable: Years Ended 2016 2015 2014 Number of 10% clients — Percentage of total revenue — % % December 31, 2016 2015 Number of 10% clients Percentage of accounts receivable % % The following provides information with respect to total revenue from contracts with U.S. federal government agencies: Years Ended 2016 2015 2014 Percentage of total revenue % % % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Allowance for Doubtful Accounts	(h) Allowance for Doubtful Accounts The allowance for doubtful accounts is an estimate prepared by management based on identification of the collectability of specific accounts and the overall condition of the receivable portfolios. When evaluating the adequacy of the allowance for doubtful accounts, the Company specifically analyzes trade receivables, including retainage receivable, historical bad debts, client credits, client concentrations, client credit worthiness, current economic trends and changes in client payment terms. If the financial condition of clients were to deteriorate, resulting in an impairment of their ability to make payments, additional allowances may be required. Likewise, should the Company determine that it would be able to realize more of its receivables in the future than previously estimated, an adjustment to the allowance would increase earnings in the period such determination was made. The allowance for doubtful accounts is reviewed on a quarterly basis and adjustments are recorded as deemed necessary.
Property and Equipment	(i) Property and Equipment Property and equipment is stated at cost, less accumulated depreciation and amortization. Depreciation and amortization is provided over the estimated useful lives of the assets as follows: Method Estimated Useful Life Furniture and equipment Straight-line 10 years Leasehold improvements Straight-line Shorter of estimated useful life or lease term Computer equipment and software Straight-line 3 to 5 years Automobiles Straight-line 5 years The Company capitalizes costs associated with internally developed and/or purchased software systems that have reached the application development stage and meet recoverability tests. Capitalized costs include external direct costs of materials and services utilized in developing or obtaining internal-use software, payroll and payroll-related expenses for employees who are directly associated with and devote time to the internal-use software project. Capitalization of such costs begins when the preliminary project stage is complete and ceases no later than the point at which the project is substantially complete and ready for its intended purpose. Costs for general and administrative, overhead, maintenance and training, as well as the cost of software that does not add functionality to existing systems, are expensed as incurred. Upon retirement or other disposition of these assets, the cost and related depreciation are removed from the accounts and the resulting gain or loss, if any, is reflected in results of operations. Expenditures for maintenance, repairs and renewals of minor items are charged to expense as incurred. Major renewals and improvements are capitalized.
Retainage Receivable	(j) Retainage Receivable Retainage receivable represents balances billed but not paid by clients pursuant to retainage provisions in the construction management contracts and will be due upon completion of specific tasks or the completion of the contract. The current portion of retainage receivable is included in accounts receivable and the long-term portion of retainage receivable is included in retainage receivable in the consolidated balance sheets.
Long-Lived Assets	(k) Long-Lived Assets Acquired intangible assets consist of contract rights, client related intangibles and trade names arising from the Company's Project Management acquisitions. Contract rights represent the fair value of contracts in progress and backlog of an acquired entity. For intangible assets purchased in a business combination, the estimated fair values of the assets are used to establish the cost bases. Valuation techniques consistent with the market approach, the income approach and the cost approach are used to measure fair value. These assets are amortized over their estimated lives which range from three to fifteen years. The Company reviews long-lived assets to be held-and-used for impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. If the sum of the undiscounted expected future cash flows over the remaining useful life of a long-lived asset is less than its carrying amount, the asset is considered to be impaired. Impairment losses are measured as the amount by which the carrying amount of the asset exceeds the fair value of the asset. When fair values are not available, the Company estimates fair value using the expected future cash flow discounted at a rate commensurate with the risks associated with the recovery of the asset. Assets to be disposed of are reported at the lower of carrying amount or fair value less costs to sell.
Goodwill	(l) Goodwill Goodwill represents the excess of purchase price and other related costs over the value assigned to the net tangible and identifiable intangible assets of businesses acquired. Acquired intangible assets other than goodwill are amortized over their useful lives. For intangible assets purchased in a business combination, the estimated fair values of the assets are used to establish the cost bases. Valuation techniques consistent with the market approach and the income approach are used to measure fair value. Goodwill is tested annually for impairment in its fiscal third quarter. The Company has determined that, due to the pending sale of its Construction Claims Group, it now has one reporting unit, the Project Management unit. The Company made that determination based on the similarity of the services provided, the methodologies in delivering its services and the similarity of the client base. Goodwill is assessed for impairment using a two-step approach. In the first step of the impairment test, the Company compares the fair value of the reporting unit to its carrying value. To the extent the carrying amount of the reporting unit exceeds its fair value, an indication exists that goodwill may be impaired and the Company must perform a second more detailed assessment. The second step, if necessary, involves allocating the reporting unit's fair value to all of its recognized and unrecognized assets and liabilities in order to determine the implied fair value of the goodwill as of the assessment date. The implied fair value of the goodwill is then compared to the carrying amount of goodwill to quantify an impairment charge as of the assessment date. Application of the goodwill impairment test requires significant judgments including estimation of future cash flows, which is dependent on internal forecasts, estimation of the long-term rate of growth for the businesses, the useful life over which cash flows will occur, and determination of the Company's weighted average cost of capital. The Company's changes in estimates and assumptions could materially affect the determination of fair value and/or conclusions on goodwill impairment. The Company performed its annual impairment test effective July 1, 2016 and noted no impairment. In the future, the Company will continue to perform the annual test during its fiscal third quarter unless events or circumstances indicate an impairment may have occurred before that time. At the time of the annual impairment test, the Construction Claims unit was still part of our continuing operations. Based on the valuation as of July 1, 2016, which utilized the same processes noted above, the fair value of the Construction Claims unit substantially exceeded its carrying value.
Investments	(m) Investments The Company will, in the ordinary course, form joint ventures for specific projects. These joint ventures have historically required limited or no investment and simply provide a pass-through for the Company's billings. Any distributions in excess of the Company's billings are accounted for as income when received. The Company's cost-basis investments at December 31, 2016 and 2015 are as follows (in thousands): December 31, 2016 2015 RAMPED Metro Joint Venture(1) $ $ Concessia, Cartera y Gestion de Infrastructuras S.A.(2) Other ​ ​ ​ ​ ​ ​ ​ ​ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) The Company has a 45% interest in this joint venture which was formed for construction management of the Riyadh Metro system in Saudi Arabia. (2) The Company has a 4.45% interest in this entity which invests in the equity of companies which finance, construct and operate various public and private infrastructure projects in Spain.
Deferred Revenue	(n) Deferred Revenue In certain instances the Company may collect advance payments from clients for future services. Upon receipt, the payments are reflected as deferred revenue in the Company's consolidated balance sheet. As the services are performed, the Company reduces the balance and recognizes revenue.
Deferred Rent	(o) Deferred Rent Rent expenses for operating leases which include scheduled rent increases is determined by expensing the total amount of rent due over the life of the operating lease on a straight-line basis. The difference between the rent paid under the terms of the lease and the rent expensed on a straight-line basis is recorded as a liability. The deferred rent at December 31, 2016 and 2015 was $2,830,000 and $1,732,000, respectively, and is included in other liabilities in the consolidated balance sheet.
Income Taxes	(p) Income Taxes The Company estimates income taxes in each of the jurisdictions in which it operates. This process involves estimating its actual current tax exposure together with assessing temporary differences resulting from differing treatment of items for tax and accounting purposes. These differences result in deferred tax assets and liabilities, which are included within the Company's consolidated balance sheets. The Company assesses the likelihood that the deferred tax assets will be recovered from future taxable income and to the extent it believes recovery is not likely, the Company establishes a valuation allowance. To the extent the Company establishes a valuation allowance in a period, it must include an expense within the tax provision in the consolidated statements of earnings. The Company has recorded a valuation allowance to reduce the deferred tax asset to an amount that is more likely to be realized in future years. If the Company determines in the future that it is more likely that the deferred tax assets subject to the valuation allowance will be realized, then the previously provided valuation allowance will be adjusted. The Company recognizes a tax benefit in the financial statements for an uncertain tax position only if management's assessment is that the position is "more likely than not" (i.e., a likelihood greater than 50 percent) to be allowed by the tax jurisdiction based solely on the technical merits of the position. The term "tax position" refers to a position in a previously filed tax return or a position expected to be taken in a future tax return that is reflected in measuring current or deferred income tax assets and liabilities for interim or annual periods.
Revenue Recognition	(q) Revenue Recognition The Company generates revenue primarily from providing professional services to its clients. Revenue is generally recognized upon the performance of services. In providing these services, the Company may incur reimbursable expenses, which consist principally of amounts paid to subcontractors and other third parties and travel and other job related expenses that are contractually reimbursable from clients. The Company has determined that it will include reimbursable expenses in computing and reporting its total revenue as long as the Company remains responsible to the client for the fulfillment of the contract and for the overall acceptability of all services provided. The Company earns its revenue from time-and-materials, cost-plus and fixed-price contracts. If estimated total costs on any contract indicate a loss, the Company charges the entire estimated loss to operations in the period the loss becomes known. The cumulative effect of revisions to revenue, estimated costs to complete contracts, including penalties, incentive awards, change orders, claims, anticipated losses, and others are recorded in the accounting period in which the events indicating a loss are known and the loss can be reasonably estimated. Such revisions could occur at any time and the effects may be material. Time-and-Materials Contracts Under its time-and-materials contracts, the Company negotiates hourly billing rates and charges its clients based on the actual time that the Company spends on a project. In addition, clients reimburse the Company for its actual out-of-pocket costs of materials and other direct incidental expenditures that the Company incurs in connection with its performance under the contract. Its profit margins on time-and-materials contracts fluctuate based on actual labor and overhead costs that the Company directly charges or allocates to contracts compared with negotiated billing rates. Revenue on these contracts are recognized based on the actual number of hours the Company spends on the projects plus any actual out-of-pocket costs of materials and other direct incidental expenditures that the Company incurs on the projects. Its time-and-materials contracts generally include annual billing rate adjustment provisions. Cost-Plus Contracts The Company has two major types of cost-plus contracts: Cost-Plus Fixed Fee Under cost-plus fixed fee contracts, the Company charges its clients for its costs, including both direct and indirect costs, plus a fixed negotiated fee. In negotiating a cost-plus fixed fee contract, the Company estimates all recoverable direct and indirect costs and then adds a fixed profit component. The total estimated cost plus the negotiated fee represents the total contract value. The Company recognizes revenue based on the actual labor costs, based on hours of labor effort, plus non-labor costs the Company incurs, plus the portion of the fixed fee the Company has earned to date. The Company invoices for its services as revenue is recognized or in accordance with agreed-upon billing schedules. Aggregate revenue from cost-plus fixed fee contracts may vary based on the actual number of labor hours worked and other actual contract costs incurred. However, if actual labor hours and other contract costs exceed the original estimate agreed to by its client, the Company generally must obtain a change order, contract modification, or successfully prevail in a claim in order to receive additional revenue relating to the additional costs (see " Change Orders and Claims "). Cost-Plus Fixed Rate Under its cost-plus fixed rate contracts, the Company charges clients for its costs plus negotiated rates based on its indirect costs. In negotiating a cost-plus fixed rate contract, the Company estimates all recoverable direct and indirect costs and then adds a profit component, which is a percentage of total recoverable costs to arrive at a total dollar estimate for the project. The Company recognizes revenue based on the actual total number of labor hours and other costs the Company expends at the cost plus the fixed rate the Company negotiated. Similar to cost-plus fixed fee contracts, aggregate revenue from cost-plus fixed rate contracts may vary and the Company generally must obtain a change order, contract modification, or successfully prevail in a claim in order to receive additional revenue relating to any additional costs that exceed the original contract estimate (see " Change Orders and Claims "). Labor costs and subcontractor services are the principal components of its direct costs on cost-plus contracts, although some include materials and other direct costs. Some of these contracts include a provision that the total actual costs plus the fee will not exceed a guaranteed price negotiated with the client. Others include rate ceilings that limit the reimbursement for general and administrative costs, overhead costs and materials handling costs. The accounting for these contracts appropriately reflects such guaranteed price or rate ceilings. Firm Fixed-Price ("FFP") Contracts The Company's FFP contracts have historically accounted for most of its fixed-price contracts. Under FFP contracts, the Company's clients pay an agreed amount negotiated in advance for a specified scope of work. The Company recognizes revenue on FFP contracts using the percentage-of-completion method (recognizing revenue as costs are incurred). Profit margins the Company recognizes in all periods prior to completion of the project on any FFP contract depend on the accuracy of the Company's estimates of approximate revenue and expenses and will increase to the extent that its current estimates of aggregate actual costs are below amounts previously estimated. Conversely, if the Company's current estimated costs exceed prior estimates, its profit margins will decrease and the Company may realize a loss on a project. In order to increase aggregate revenue on the contract, the Company generally must obtain a change order, contract modification, or successfully prevail in a claim in order to receive payment for the additional costs (see " Change Orders and Claims "). Change Orders and Claims Change orders are modifications of an original contract that effectively change the provisions of the contract without adding new provisions. Either the Company or its client may initiate change orders. They may include changes in specifications or design, manner of performance, facilities, equipment, materials, sites and period of completion of the work. Claims are amounts in excess of the agreed contract price that the Company seeks to collect from its clients or others for client-caused delays, errors in specifications and designs, contract terminations, change orders that are either in dispute or are unapproved as to both scope and price, or other causes of unanticipated additional contract costs. Change orders and claims occur when changes are experienced once contract performance is underway. Change orders are sometimes documented and terms of such change orders are agreed with the client before the work is performed. Sometimes circumstances require that work progresses before agreement is reached with the client. Costs related to change orders and claims are recognized when they are incurred. Change orders and claims are included in total estimated contract revenue when it is probable that the change order or claim will result in a bona fide addition to contract value that can be reliably estimated. No profit is recognized on claims until final settlement occurs; unapproved change orders are evaluated as claims. This can lead to a situation where costs are recognized in one period and revenue is recognized when client agreement is obtained or claims resolution occurs, which can be in subsequent periods. The Company has contracts with the U.S. government that contain provisions requiring compliance with the U.S. Federal Acquisition Regulations ("FAR"). These regulations are generally applicable to all of its federal government contracts and are partially or fully incorporated in many local and state agency contracts. They limit the recovery of certain specified indirect costs on contracts subject to the FAR. Cost-plus contracts covered by the FAR provide for upward or downward adjustments if actual recoverable costs differ from the estimate billed under forward pricing arrangements. Most of its federal government contracts are subject to termination at the convenience of the client. Contracts typically provide for reimbursement of costs incurred and payment of fees earned through the date of such termination. Federal government contracts which are subject to the FAR and some state and local governmental agencies require audits, which are performed for the most part by the Defense Contract Audit Agency ("DCAA"). The DCAA audits the Company's overhead rates, cost proposals, incurred government contract costs, and internal control systems. During the course of its audits, the DCAA may question incurred costs if it believes the Company has accounted for such costs in a manner inconsistent with the requirements of the FAR or Cost Accounting Standards and recommend that its U.S. government corporate administrative contracting officer disallow such costs. Historically, the Company has not experienced significant disallowed costs as a result of such audits. However, the Company can provide no assurance that the DCAA audits will not result in material disallowances of incurred costs in the future.
Share-Based Compensation	(r) Share-Based Compensation The Company uses the Black-Scholes option pricing model to measure the estimated fair value of options to purchase the Company's common stock. The compensation expense, less estimated forfeitures, is being recognized over the service period on a straight-line basis. The Company's policy is to use newly issued shares to satisfy the exercise of stock options.
Advertising Costs	(s) Advertising Costs Advertising costs are expensed as incurred and amounted to the following (in thousands): Years Ended December 31, 2016 2015 2014 $556 $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Earnings per Share	(t) Earnings per Share Basic earnings per common share has been computed using the weighted-average number of shares of common stock outstanding during the year. Diluted earnings per common share incorporates the incremental shares issuable upon the assumed exercise of stock options using the treasury stock method. Dilutive stock options increased average common shares outstanding by approximately 437,000 shares for the year ended December 31, 2015. Options to purchase 6,899,000 shares, 3,849,000 shares and 3,521,000 shares of the Company's common stock were not included in the calculation of common shares outstanding for the years ended December 31, 2016, 2015 and 2014, respectively, because they were anti-dilutive. The following table provides a reconciliation to net (loss) earnings used in the numerator for (loss) earnings per share from continuing operations (in thousands): 2016 2015 2014 (Loss) earnings from continuing operations $ ) $ $ Less: net earnings—noncontrolling interest ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (Loss) earnings $ ) $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
New Accounting Pronouncements	(u) New Accounting Pronouncements In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers, which will replace most existing revenue recognition guidance in U.S. GAAP, including industry-specific guidance. The core principle of the ASU is that an entity should recognize revenue for the transfer of goods or services equal to the amount that it expects to be entitled to receive for those goods or services. The ASU requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments. The ASU allows for both retrospective and prospective methods of adoption. The ASU was to be effective for interim and annual periods commencing after December 15, 2016, however, in August 2015, the FASB issued ASU 2015-14 which defers the effective date for one year. Early adoption is permitted as of January 1, 2017. In December 2016, the FASB issued ASU 2016-20, Technical Corrections and Improvements to Topic 606, 'Revenue From Contracts With Customers,"' which made minor changes to certain narrow aspects of the guidance. The Company anticipates that it will use the modified retrospective method of adoption in which the cumulative effect of applying the ASU will be recognized at January 1, 2018, the date of initial application. The Company is in the process of determining the method of adoption and assessing the impact of this ASU on its consolidated financial statements. In August 2014, the FASB issued Accounting Standards Update No. 2014-15, Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern ("ASU 2014-15"). The objective of ASU 2014-15 is to provide guidance in GAAP about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern and to provide related footnote disclosures. ASU 2014-15 requires a management evaluation about whether there are conditions or events, considered in the aggregate, that raise substantial doubt about an entity's ability to continue as a going concern within one year after the date the financial statements are issued or available to be issued. In doing so, ASU 2014-15 should reduce diversity in the timing and content of footnote disclosures. ASU 2014-15 is effective for fiscal years ending after December 15, 2016. The Company has adopted this guidance effective for its year ended December 31, 2016. In January 2016, the FASB issued ASU 2016-01, Financial Instruments—Overall (Topic 825-10), which requires all equity investments to be measured a fair value with changes in fair value recognized through net income (other than those accounted for under equity method of accounting or those that result in consolidation of the investee). The amendments in this ASU also require an entity to (1) present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments and (2) provide separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements. In addition the amendments in this Update eliminate the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet. This ASU is effective for the Company commencing January 1, 2018. The Company is in the process of assessing the impact of this ASU on its consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which will require the Company the recognize lease assets and lease liabilities (related to leases previously classified as operating under previous GAAP) on its consolidated balance sheet. The ASU will be effective for the Company commencing January 1, 2019. The Company is in the process of assessing the impact of this ASU on its consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments (Topic 326)—Credit Losses: Measurement of Credit Losses on Financial Instruments, which provides guidance regarding the measurement of credit losses on financial instruments. The new guidance replaces the incurred loss impairment methodology in the current guidance with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to determine credit loss estimates. This ASU will be effective for us commencing January 1, 2020 with early adoption permitted commencing January 1, 2019. We are in the process of assessing the impact of this ASU on our consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. The primary purpose of the ASU is to reduce the diversity in practice that has resulted from the lack of consistent principles on this topic. This ASU's amendments add or clarify guidance on eight cash flow issues: debt prepayment, settlement of zero-coupon debt instruments, contingent consideration payments, insurance claim proceeds, life insurance proceeds, distributions from equity method investees, beneficial interests in securitization transactions and separately identifiable cash flows and application of the predominance principle. The ASU is effective commencing January 1, 2018 with earlier adoption permitted. We adopted this ASU which only affected our presentation of payments for deferred consideration related to the IMS acquisition by reclassifying the payments from operating cash flows to financing cash flows. In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory. Under the new standard, an entity is required to recognize the income tax consequences of an intra-entity transfer of an asset (with the exception of inventory) when the transfer occurs. Under current GAAP, entities are prohibited from recognizing current and deferred income taxes for an intra-entity transfer until the asset is sold to a third party. Examples of assets that would be affected by the new guidance are intellectual property and property, plant, and equipment. The ASU will be effective for us commencing January 1, 2018 with early adoption permitted as of January 1, 2017. We expect that adoption of this ASU will not have a material effect on our consolidated financial statements. In November 2016, the FASB issued ASU 2016-18, Restricted Cash (a consensus of the FASB Emerging Issues Task Force), which addresses classification and presentation of changes in restricted cash on the statement of cash flows. The ASU requires an entity's reconciliation of the beginning-of-period and end-of-period total amounts shown on the statement of cash flows to include in cash and cash equivalents amounts generally described as restricted cash and restricted cash equivalents. The ASU does not define restricted cash or restricted cash equivalents, but the Company will need to disclose the nature of the restrictions. The ASU is effective for the Company for annual and interim periods in fiscal years beginning after December 15, 2017. Early adoption is permitted. When the Company adopts the ASU, it will use a retrospective transition method for each period presented. In January 2017, the FASB issued ASU 2017-01, amending Business Combinations: Clarifying the Definition of a Business, to clarify the definition of a business with the objective of providing a more robust framework to assist management when evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The standard will be effective for the Company for its fiscal year beginning April 1, 2018, including interim periods within that fiscal year, with early application permitted. The amendments are to be applied prospectively to business combinations that occur after the effective date.

Discontinued Operations (Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2016
Discontinued Operations
Schedule of the carrying amounts of assets and liabilities and earnings related to discontinued operations	The carrying amounts of assets and liabilities of the discontinued operations which have been classified as held for sale are as follows (in thousands): December 31, 2016 2015 Trade receivables $ $ Prepaid expense and other current assets Income taxes receivable ​ ​ ​ ​ ​ ​ ​ ​ Total current assets classified as held for sale $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Property, plant and equipment Acquired intangibles, net Goodwill Investments Deferred income tax assets Other assets ​ ​ ​ ​ ​ ​ ​ ​ Total non-current assets classified as held for sale $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts payable Income taxes payable ) Deferred revenue Other current liabilities ​ ​ ​ ​ ​ ​ ​ ​ Total current liabilities classified as held for sale $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Deferred income taxes Deferred revenue Other liabilities ​ ​ ​ ​ ​ ​ ​ ​ Total non-current liabilities classified as held for sale $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The line items constituting earnings from discontinued operations consist of the following (in thousands): Years Ended December 31, 2016 2015 2014 Consulting fee revenue $ $ $ Reimbursable expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total revenue ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cost of services Reimbursable expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total direct expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross profit Selling, general and administrative expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Operating profit Interest and related financing fees, net ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (Loss) earnings before income taxes ) ) ) Income tax expense ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net loss from discontinued operations $ ) $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Summary of Significant Accoun30

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2016
Summary of Significant Accounting Policies
Schedule of number of the Company's clients which contributed 10% or more of revenue	Years Ended 2016 2015 2014 Number of 10% clients — Percentage of total revenue — % % December 31, 2016 2015 Number of 10% clients Percentage of accounts receivable % %
Schedule of information with respect to total revenue from contracts with U.S. federal government agencies	Years Ended 2016 2015 2014 Percentage of total revenue % % % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of estimated useful lives of the assets	Method Estimated Useful Life Furniture and equipment Straight-line 10 years Leasehold improvements Straight-line Shorter of estimated useful life or lease term Computer equipment and software Straight-line 3 to 5 years Automobiles Straight-line 5 years
Schedule of the Company's cost-basis investments	The Company's cost-basis investments at December 31, 2016 and 2015 are as follows (in thousands): December 31, 2016 2015 RAMPED Metro Joint Venture(1) $ $ Concessia, Cartera y Gestion de Infrastructuras S.A.(2) Other ​ ​ ​ ​ ​ ​ ​ ​ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (1) The Company has a 45% interest in this joint venture which was formed for construction management of the Riyadh Metro system in Saudi Arabia. (2) The Company has a 4.45% interest in this entity which invests in the equity of companies which finance, construct and operate various public and private infrastructure projects in Spain.
Schedule of advertising costs that are expensed as incurred	Advertising costs are expensed as incurred and amounted to the following (in thousands): Years Ended December 31, 2016 2015 2014 $556 $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of reconciliation to net (loss) earnings used in the numerator for (loss) earnings per share from continuing operations	The following table provides a reconciliation to net (loss) earnings used in the numerator for (loss) earnings per share from continuing operations (in thousands): 2016 2015 2014 (Loss) earnings from continuing operations $ ) $ $ Less: net earnings—noncontrolling interest ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ (Loss) earnings $ ) $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Accounts Receivable (Tables)

Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2016
Accounts Receivable
Components of accounts receivable	The components of accounts receivable are as follows (in thousands): December 31, 2016 2015 Billed $ $ Retainage, current portion Unbilled ​ ​ ​ ​ ​ ​ ​ ​ Allowance for doubtful accounts ) ) ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2016
Property and Equipment
Schedule of components of property and equipment	The components of property and equipment are as follows (in thousands): December 31, 2016 2015 Furniture and equipment $ $ Leasehold improvements Automobiles Computer equipment and software ​ ​ ​ ​ ​ ​ ​ ​ Less accumulated depreciation and amortization ) ) ​ ​ ​ ​ ​ ​ ​ ​ Property and equipment, net $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of information with respect to depreciation expense	Information with respect to depreciation expense is as follows (in thousands): Years Ended December 31, 2016 2015 2014 Total depreciation expense $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Portion charged to cost of services $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Portion charged to selling, general and administrative expense $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2016
Intangible Assets
Summary of acquired intangible assets	The following table summarizes the Company's acquired intangible assets (in thousands): December 31, 2016 2015 Gross Accumulated Gross Accumulated Client relationships $ $ $ $ Acquired contract rights Trade names ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Intangible assets, net $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Summary of amortization expense related to intangible assets	Amortization expense related to intangible assets was as follows (in thousands): Years Ended December 31, 2016 2015 2014 $3,045 $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Estimated amortization expense of intangible assets for the next five years	The following table presents the estimated amortization expense based on our present intangible assets for the next five years (in thousands): Years Ending December 31, Estimated 2017 $ 2018 2019 2020 2021

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2016
Goodwill
Summary of changes in the Company's carrying value of goodwill	The following table summarizes the changes in the Company's carrying value of goodwill during 2016 and 2015 (in thousands): Balance, December 31, 2014 $ Additions Translation adjustments ) ​ ​ ​ ​ ​ Balance, December 31, 2015 Translation adjustments ​ ​ ​ ​ ​ Balance, December 31, 2016 $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Accounts Payable and Accrued 35

Accounts Payable and Accrued Expenses (Tables)	12 Months Ended
	Dec. 31, 2016
Accounts Payable and Accrued Expenses
Components of accounts payable and accrued expenses	Below are the components of accounts payable and accrued expenses (in thousands): December 31, 2016 2015 Accounts payable $ $ Accrued payroll and related expenses Accrued subcontractor fees Accrued agency fees Accrued legal and professional fees Other accrued expenses ​ ​ ​ ​ ​ ​ ​ ​ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Notes Payable and Long-Term D36

Notes Payable and Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2016
Notes Payable and Long-Term Debt
Summary of outstanding debt obligations	Outstanding debt obligations are as follows (in thousands): December 31, 2016 2015 2014 Term Loan Facility $ $ 2014 Domestic Revolving Credit Facility 2014 International Revolving Credit Facility Borrowings under revolving credit facilities with a consortium of banks in Spain Borrowing from Philadelphia Industrial Development Corporation Other notes payable — ​ ​ ​ ​ ​ ​ ​ ​ Less current maturities ​ ​ ​ ​ ​ ​ ​ ​ Notes payable and long-term debt, net of current maturities $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of contractual maturities of long term debt	At December 31, 2016, contractually scheduled maturities of long term debt were as follows (in thousands): Years Ending December 31, 2017 $ 2018 2019 2020 2021 Thereafter ​ ​ ​ ​ ​ Total $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Supplemental Cash Flow Inform37

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2016
Supplemental Cash Flow Information
Schedule of other non-cash activity	Other activity is provided in the following table (in thousands): Years Ended December 31, 2016 2015 2014 Interest and related financing fees paid $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Income taxes paid $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Increase in property and equipment from a tenant improvement allowance related to the relocation of the corporate headquarters $ — $ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Reduction of noncontrolling interest in connection with acquisitions of additional interests in Engineering S.A. $ — $ ) $ ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Increase in additional paid in capital from issuance of shares of common stock in connection with the acquisition of an additional interest in ESA $ — $ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Decrease in additional paid-in capital related to ESA Put Options $ ) $ — $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Increase in additional paid in capital from issuance of shares of common stock related to purchase of CPI $ — $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Increase in additional paid in capital from issuance of shares of common stock from cashless exercise of stock options $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Share-Based Compensation (Table

Share-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2016
Share-Based Compensation
Schedule of assumptions used to estimate the fair value of options granted	December 31, 2016 2015 2014 Average expected life (years) Forfeiture range % 0 - 5.0 % 0 - 5.0 % Weighted average forfeiture rate % % % Dividends % % % Volatility range 47.4 - 57.5 % 46.9 - 59.9 % 61.5 - 65.5 % Weighted average volatility % % % Range of risk-free interest rates 0.97 - 1.46 % 1.07 - 1.61 % 0.86 - 1.74 % Weighted average risk-free interest rate % % % Weighted average fair value at grant date $ $ $
Summary of the Company's stock option activity and related information	A summary of the Company's stock option activity and related information for the years ended December 31, 2016, 2015 and 2014 is as follows (in thousands, except exercise price and remaining life data): Options Weighted Weighted Aggregate Outstanding, December 31, 2013 $ Granted Exercised ) Expired ) Forfeited ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Outstanding, December 31, 2014 Granted Exercised ) Expired ) Forfeited ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Outstanding, December 31, 2015 Granted Exercised ) Expired ) Forfeited ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Outstanding, December 31, 2016 $ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Exercisable, December 31, 2016 $ $ — ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of weighted average characteristics of outstanding stock options for various price ranges	Options Outstanding Options Exercisable Exercise Prices Number Weighted Weighted Number Weighted $2.85 $ $ 2.89 3.00 3.12 3.35 — 3.46 3.55 3.67 3.91 3.95 4.00 — 4.03 4.04 4.31 — 4.35 4.46 — 4.84 4.90 4.95 5.00 — 5.17 — 5.31 5.47 5.73 5.83 6.31 6.61 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Summary of the Company's non-vested stock option activity and related information	The following table summarizes the Company's non-vested stock option activity and related information for the years ended December 31, 2016, 2015 and 2014 (in thousands, except weighted average grant date fair value): Options Weighted Non-vested options at December 31, 2013 Granted Vested ) Forfeited ) ​ ​ ​ ​ ​ ​ ​ ​ Non-vested options at December 31, 2014 Granted Vested ) Forfeited ) ​ ​ ​ ​ ​ ​ ​ ​ Non-vested options at December 31, 2015 Granted Vested ) Forfeited ) ​ ​ ​ ​ ​ ​ ​ ​ Non-vested options at December 31, 2016 $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Non-Employee Director Stock Grant Plan
Share-Based Compensation
Schedule of information with respect to the plan's activity	Information with respect to the plan's activity follows (in thousands): Years Ended 2016 2015 2014 Shares issued Compensation expense $ $ $ Deferred stock units issued — — Compensation expense $ $ — $ —
2008 Employee Stock Purchase Plan
Share-Based Compensation
Schedule of information with respect to the plan's activity	Information with respect to the plan's activity follows (in thousands): Years Ended 2016 2015 2014 Shares purchased Aggregate purchase price $ $ $ Compensation expense $ $ $

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
Income Taxes
Schedule of components of earnings (loss) before income taxes and the related income tax expense by United States and foreign jurisdictions	The components of earnings before income taxes by United States and foreign jurisdictions were as follows (in thousands): Years Ended December 31, 2016 2015 2014 United States $ ) $ ) $ ) Foreign jurisdictions ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ ) $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of income tax expense (benefit)	Income tax expense (benefit) consists of the following (in thousands): Current Deferred Total Year ended December 31, 2016: U.S. federal $ — $ — $ — State and local — — — Foreign jurisdictions ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ $ ) $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2015: U.S. federal $ — $ — $ — State and local — — — Foreign jurisdictions ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ $ ) $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year ended December 31, 2014: U.S. federal $ — $ — $ — State and local — — — Foreign jurisdictions ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ $ $ ) $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of the differences between income taxes based on the statutory U.S. federal income tax rate and the Company's effective income tax rate	The differences between income taxes based on the statutory U.S. federal income tax rate and the Company's effective income tax rate are provided in the following reconciliation (in thousands). Years Ended December 31, 2016 2015 2014 Statutory federal income tax $ ) $ $ Foreign tax benefit for earnings taxed at lower rates ) ) Change in the valuation allowance Valuation allowance—discontinued operations NOL adjustment ) ) ) Net liability (reductions) additions for uncertain tax positions ) ) Excess compensation State and local income taxes, net of federal income tax benefit ) ) ) Stock options Purchase accounting reversal — — ) Other ) ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of tax effect of temporary differences that give rise to deferred tax assets and deferred tax liabilities	The tax effect of temporary differences that give rise to deferred tax assets and deferred tax liabilities are as follows (in thousands): December 31, 2016 2015 Deferred tax assets: Net operating loss carry forward—U.S. operations $ $ Amortization of intangibles Net operating loss carry forward—foreign operations Compensated absences Foreign income taxes on currency translation Share based compensation Allowance for uncollectible accounts Bonus accrual — Foreign tax credit Other ​ ​ ​ ​ ​ ​ ​ ​ Total gross deferred tax assets Valuation allowances ) ) ​ ​ ​ ​ ​ ​ ​ ​ Net deferred tax assets ​ ​ ​ ​ ​ ​ ​ ​ Deferred tax liabilities: Intangible assets ) ) Depreciation ) ) Prepaid expenses ) ) Change in tax method ) ) Accrued expenses ) — ​ ​ ​ ​ ​ ​ ​ ​ Total gross deferred tax liabilities ) ) ​ ​ ​ ​ ​ ​ ​ ​ Net deferred tax assets $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The deferred taxes have been reflected in the balance sheet based on tax jurisdiction as follows: Deferred tax asset $ $ Deferred tax liability ) ) ​ ​ ​ ​ ​ ​ ​ ​ Net deferred tax assets $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of changes to the Company's uncertain tax positions	The following table indicates the changes to the Company's uncertain tax positions for the years ended December 31, 2016 and 2015 including interest and penalties (in thousands): Years Ended 2016 2015 Balance, beginning of year $ $ Reductions based on tax positions related to prior years ) ) Reduction due to settlements with taxing authorities ) ) Additions based on tax positions related to prior years ​ ​ ​ ​ ​ ​ ​ ​ Balance, end of year $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Operating Leases (Tables)

Operating Leases (Tables)	12 Months Ended
	Dec. 31, 2016
Operating Leases
Schedule of approximate future minimum payments under leases	At December 31, 2016, approximate future minimum payments under these leases that have remaining non-cancelable lease terms in excess of one year are as follows (in thousands): Years Ending December 31, 2017 $ 2018 2019 2020 2021 Thereafter ​ ​ ​ ​ ​ Total $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Segment and Related Informati41

Segment and Related Information (Tables)	12 Months Ended
	Dec. 31, 2016
Segment and Related Information
Consulting Fee Revenue and Total Revenue by Geographic Region	The following tables present certain information for the Project Management Group's operations (in thousands): Consulting Fee Revenue by Geographic Region 2016 2015 2014 United States $ % $ % $ % Latin America Europe Middle East Africa Asia/Pacific ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ % $ % $ % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Revenue by Geographic Region 2016 2015 2014 United States $ % $ % $ % Latin America Europe Middle East Africa Asia/Pacific ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ % $ % $ % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Operating Profit (Loss)	The following tables present certain information for the Project Management Group's operations (in thousands): Operating Profit (Loss) 2016 2015 2014 United States $ $ $ Latin America ) Europe ) ) ) Middle East Africa Asia/Pacific Corporate ) ) ) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ ) $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Depreciation and Amortization Expense	The following tables present certain information for the Project Management Group's operations (in thousands): Depreciation and Amortization Expense 2016 2015 2014 Project Management $ $ $ Corporate ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Consulting Fee Revenue and Total Revenue By Client Type	The following tables present certain information for the Project Management Group's operations (in thousands): Consulting Fee Revenue By Client Type 2016 2015 2014 U.S. federal government $ % $ % $ % U.S. state, regional and local governments Foreign governments Private sector ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ % $ % $ % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total Revenue By Client Type 2016 2015 2014 U.S. federal government $ % $ % $ % U.S. state, regional and local governments Foreign governments Private sector ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total $ % $ % $ % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Property, Plant and Equipment, Net by Geographic Location	The following tables present certain information for the Project Management Group's operations (in thousands): Property, Plant and Equipment, Net by Geographic Location December 31, 2016 2015 United States $ $ Latin America Europe Middle East Africa Asia/Pacific ​ ​ ​ ​ ​ ​ ​ ​ Total $ $ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Liquidity (Details)

Liquidity (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2014	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2012
Consulting fee revenue (as a percent)			100.00%	100.00%	100.00%
Accounts receivable, allowance for doubtful accounts			$ 71,082,000	$ 60,535,000
Middle East and Africa
Consulting fee revenue (as a percent)			52.00%
Libya
Accounts receivable						$ 59,937,000
Collection amount applied to receivables			$ 9,511,000
Iraq
Accounts receivable, allowance for doubtful accounts			5,078,000
Oman
Consulting fee revenue (as a percent)				11.60%	14.50%
Extension period for the completion of the project	12 months
Accounts receivable			27,132,000
Collection amount applied to receivables		$ 6,153,000	42,000,000
Accounts receivable, past due			$ 16,500,000

Discontinued Operations (Detail

Discontinued Operations (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2017
Carrying amounts of assets and liabilities of the discontinued operations which are classified as held for sale:
Trade receivables	$ 50,892,000	$ 55,864,000
Prepaid expense and other current assets	3,064,000	3,269,000
Income taxes receivable	188,000	959,000
Total current assets classified as held for sale	54,144,000	60,092,000
Property, plant and equipment	4,617,000	4,770,000
Acquired intangibles, net	3,397,000	4,886,000
Goodwill	22,714,000	25,154,000
Investments	6,000	8,000
Deferred income tax assets	1,954,000	1,305,000
Other assets	610,000	485,000
Total non-current assets classified as held for sale	33,298,000	36,608,000
Accounts payable	23,406,000	23,121,000
Income taxes payable	(415,000)	81,000
Deferred revenue	1,562,000	1,444,000
Other current liabilities	3,150,000	2,851,000
Total current liabilities classified as held for sale	27,703,000	27,497,000
Deferred income taxes	2,022,000	1,536,000
Deferred revenue	1,012,000	1,998,000
Other liabilities	1,645,000	2,869,000
Total non-current liabilities classified as held for sale	4,679,000	6,403,000
Details of earnings from discontinued operations
Consulting fee revenue	164,478,000	163,074,000	$ 148,290,000
Reimbursable expenses	4,774,000	4,955,000	5,549,000
Total revenue	169,252,000	168,029,000	153,839,000
Cost of services	73,914,000	73,521,000	65,949,000
Reimbursable expenses	4,774,000	4,955,000	5,549,000
Total direct expenses	78,688,000	78,476,000	71,498,000
Gross profit	90,564,000	89,553,000	82,341,000
Selling, general and administrative expenses	84,047,000	77,813,000	71,345,000
Operating profit	6,517,000	11,740,000	10,996,000
Interest and related financing fees, net	12,932,000	12,637,000	28,921,000
(Loss) earnings before income taxes	(6,415,000)	(897,000)	(17,925,000)
Income tax expense	4,661,000	1,977,000	788,000
Net loss from discontinued operations	(11,076,000)	$ (2,874,000)	$ (18,713,000)
Potential tax liability related to certain foreign subsidiaries	2,106,000
Construction Claims Group
Details of earnings from discontinued operations
Expenses related to the sale of discontinued operations	$ 3,044,000
Forecast | Construction Claims Group | Discontinued operations, Held for sale
Details of assets and liabilities and earnings related to discontinued operations
Discontinued operation, consideration				$ 147,000,000

Summary of Significant Accoun44

Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details) - customer	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restricted Cash
Minimum completion period of the project	1 year
Total revenue | Customer concentration
Concentrations of Credit Risk
Number of 10% clients		1	1
Percentage of concentration risk		10.00%	13.00%
Total revenue | Contracts with U.S. federal government agencies
Concentrations of Credit Risk
Percentage of concentration risk	2.00%	2.00%	3.00%
Total Accounts receivable | Concentrations of credit risk
Concentrations of Credit Risk
Number of 10% clients	2	1
Percentage of concentration risk	32.00%	19.00%

Summary of Significant Accoun45

Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2016
Furniture and equipment
Property and Equipment
Estimated Useful Life	10 years
Computer equipment and software | Minimum
Property and Equipment
Estimated Useful Life	3 years
Computer equipment and software | Maximum
Property and Equipment
Estimated Useful Life	5 years
Automobiles
Property and Equipment
Estimated Useful Life	5 years

Summary of Significant Accoun46

Summary of Significant Accounting Policies - Intangible Assets and Goodwill (Details)	12 Months Ended
	Dec. 31, 2016USD ($)item
Goodwill
Number of reporting units | item	1
Goodwill impairment | $	$ 0
Minimum
Intangible Assets
Estimated lives of intangible assets	3 years
Maximum
Intangible Assets
Estimated lives of intangible assets	15 years

Summary of Significant Accoun47

Summary of Significant Accounting Policies - Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investments
Investments	$ 3,581	$ 8,378
RAMPED Metro Joint Venture
Investments
Investments	$ 767	4,696
Ownership interest (as a percent)	45.00%
Concessia, Cartera y Gestion de Infrastructuras S.A.
Investments
Investments	$ 2,515	2,927
Ownership interest (as a percent)	4.45%
Other
Investments
Investments	$ 299	$ 755

Summary of Significant Accoun48

Summary of Significant Accounting Policies - General Policies (Details)	12 Months Ended
	Dec. 31, 2016USD ($)itemshares	Dec. 31, 2015USD ($)shares	Dec. 31, 2014USD ($)shares
Deferred Rent
Deferred rent included in other liabilities	$ 2,830,000	$ 1,732,000
Revenue Recognition
Number of major types of cost-plus contracts | item	2
Profit recognized on claims until final settlement	$ 0
Advertising Costs
Advertising costs	$ 556,000	$ 421,000	$ 536,000
Earnings per Share
Dilutive stock options (in shares) | shares		437,000
Anti-dilutive securities that were not included in the calculation of common shares outstanding | shares	6,899,000	3,849,000	3,521,000
(Loss) earnings from continuing operations	$ (7,616,000)	$ 10,613,000	$ 13,866,000
Less: net earnings - noncontrolling interest	136,000	808,000	1,301,000
(Loss) earnings	$ (7,752,000)	$ 9,805,000	$ 12,565,000

Acquisitions - IMS Proje Yoneti

Acquisitions - IMS Proje Yonetimi ve Danismanlik A.S. and Collaborative Partners, Inc. (Details)

May 12, 2015TRY

May 12, 2015USD ($)

Apr. 15, 2015TRYitem

Apr. 15, 2015USD ($)

Dec. 23, 2014USD ($)$ / shares

Dec. 18, 2014

Mar. 07, 2014USD ($)shares

Dec. 23, 2013USD ($)item$ / sharesshares

May 31, 2015USD ($)shares

Apr. 30, 2014USD ($)

Dec. 31, 2016USD ($)

Dec. 31, 2014USD ($)

Dec. 31, 2013USD ($)

Dec. 31, 2015USD ($)

Apr. 15, 2015USD ($)item

Acquisitions

Acquisition-related costs

$ 0

$ 0

$ 139,000

IMS

Acquisitions

Number of professionals | item

80

80

Consideration for acquisition

TRY 12,411,000

$ 4,640,000

Cash consideration transferred

TRY 8,272,000

$ 3,145,000

4,139,000

1,547,000

Acquisition consideration paid

TRY 4,400,000

$ 1,626,000

Contingent consideration arrangement, evaluation period

12 months

12 months

Increase (decrease) in the contingent consideration

$ (673,000)

$ (673,000)

IMS | EBITDA Target 1

Acquisitions

Contingent consideration

TRY 1,700,000

$ 628,000

IMS | EBITDA Target 2

Acquisitions

Contingent consideration

1,500,000

554,000

IMS | Minimum | EBITDA Target 1

Acquisitions

EBITDA Target

3,500,000

1,294,000

IMS | Minimum | EBITDA Target 2

Acquisitions

EBITDA Target

3,200,000

$ 1,183,000

IMS | Maximum | EBITDA Target 2

Acquisitions

EBITDA Target | TRY

TRY 3,500,000

CPI

Acquisitions

Number of professionals | item

30

Value of shares issued as part of counter offer

$ 618,000

$ 2,450,000

$ 530,000

Contingent consideration

$ 500,000

$ 2,697,000

Shares issued in satisfaction of purchase price installment | shares

171,308

678,670

148,460

Share price (in dollars per share) | $ / shares

$ 5.42

$ 3.61

Value in excess of CPI's common equity

$ 600,000

Common stock issued for acquisitions of BCA and CPI

$ 350,000

Period over which average closing price of common stock is used to compute shares issuable

10 days

Increase in share price (as a percent)

50.00%

Percentage of the operating profit of CPI in excess of $1,000,000 for the first 12-month period considered for determining the additional shares to be issued to the sellers

50.00%

Threshold amount of operating profit for the first 12-month period considered for determining the additional shares to be issued to the sellers

$ 1,000,000

Period for which operating profit is considered for determining the additional shares to be issued to the sellers

12 months

Percentage of the net revenue backlog in excess of $10,000,000 on the date 60 days after closing date considered for determining the additional shares to be issued to the sellers

5.00%

Threshold amount of net revenue backlog on the date 60 days after closing date considered for determining the additional shares to be issued to the sellers

$ 10,000,000

Period for which net revenue backlog is considered for determining the additional shares to be issued to the sellers

60 days

Increase (decrease) in the contingent consideration

$ (1,225,000)

$ 215,000

Acquisitions - Engineering S.A.

Acquisitions - Engineering S.A. (Details)

Jun. 17, 2016BRLshareholder

Aug. 12, 2015USD ($)shares

Apr. 04, 2015USD ($)

Jul. 23, 2013BRL

Jul. 23, 2013USD ($)

Apr. 30, 2012BRL

Apr. 30, 2012USD ($)

Feb. 28, 2011BRLitem

Feb. 28, 2011USD ($)

Nov. 30, 2015USD ($)shares

Aug. 31, 2015shares

Apr. 30, 2015shareholder

Apr. 30, 2014shareholder

Dec. 31, 2016BRL

Dec. 31, 2016USD ($)

Dec. 31, 2015BRL

Dec. 31, 2014USD ($)

Oct. 31, 2014BRL

Oct. 31, 2014USD ($)

Feb. 28, 2011USD ($)item

Acquisitions

Reduction in noncontrolling interests

$ 3,556,000

Engineering S.A.

Acquisitions

Ownership interest acquired (as a percent)

91.00%

Business Combination, Consideration Transferred, Liabilities Incurred | BRL

BRL 10,645,000

Acquisition consideration paid | BRL

BRL 10,645,000

Price guarantee for stock purchase

$ 580,000

$ 580,000

Common stock repurchased (in shares) | shares

129,648

129,648

Number of minority shareholders who exercised Put Option | shareholder

3

2

Value of shares purchased on exercise of put options

BRL 8,656,000

$ 2,659,000

Minority shareholders ownership percentage

19.00%

Premium on common stock (as a percent)

25.00%

Consideration requested by sellers

$ 4,374,000

Days share price is guaranteed after sale of stock

30 days

Shares issued as part of counter offer in number of shares | shares

924,736

924,736

Engineering S.A. | Payments due for the Engineering S. A. acquisition

Acquisitions

Weighted average indebtedness discount rate (as a percent)

4.72%

4.72%

Payoff and termination of term loan

BRL 11,372,000

$ 5,095,000

BRL 6,624,000

$ 3,508,000

Hill Spain | Engineering S.A.

Acquisitions

Ownership interest acquired (as a percent)

60.00%

91.00%

60.00%

Number of professionals employed | item

400

400

Cash consideration transferred

BRL 22,200,000

$ 13,392,000

Minimum additional payments due on April 30, 2012

7,400,000

$ 4,464,000

Minimum additional payments due on April 30, 2013

7,400,000

4,464,000

Potential additional payment

BRL 5,000,000

$ 3,016,000

Multiple of earnings for determining purchase price of minority shares

7

7

7

Call option purchase price premium if exercised by Gerens Hill (as a percent)

5.00%

5.00%

5.00%

5.00%

Call/put option exercise period after audited financial statements

3 months

3 months

3 months

3 months

Number of minority shareholders who exercised Put Option | shareholder

2

Value of shares purchased on exercise of put options

BRL 7,838,000

$ 3,556,000

Minority shareholders ownership percentage

72.00%

Reduction in noncontrolling interests

BRL 5,839,000

$ 2,649,000

Reduction in additional paid in capital through equity transaction

BRL 1,999,000

$ 907,000

Potential payments considered for discounting

BRL 17,200,000

$ 10,376,000

Hill Spain | Engineering S.A. | Maximum

Acquisitions

Consideration for acquisition

BRL 42,000,000

$ 25,336,000

Accounts Receivable - Component

Accounts Receivable - Components of Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Components of accounts receivable
Billed	$ 200,134	$ 216,618
Retainage, current portion	10,824	13,660
Unbilled	24,678	17,810
Accounts receivable, gross	235,636	248,088
Allowance for doubtful accounts	(71,082)	(60,535)
Total	$ 164,554	$ 187,553

Accounts Receivable - General (

Accounts Receivable - General (Details) - USD ($)	1 Months Ended		12 Months Ended
	Feb. 28, 2017	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounts Receivable
Billed receivables		$ 216,618,000	$ 200,134,000	$ 216,618,000
Bad debt expense included in selling, general and administrative expenses			14,454,000	6,262,000	$ (5,195,000)
Various branches of the U.S. government
Accounts Receivable
Billed receivables		694,000	673,000	694,000
Foreign governments
Accounts Receivable
Billed receivables		$ 131,015,000	100,409,000	$ 131,015,000
MOTC
Accounts Receivable
Extension period for the completion of the project		18 months
Collection amount applied to receivables	$ 6,153,000		42,000,000
Accounts receivable			27,132,000
Accounts receivable, past due			16,500,000
Retainage receivable included in non-current Retainage Receivable			16,400,000
Retention amount			8,400,000
Amount of retainage receivable relating to Defect and Liability Period			$ 8,000,000
Percentage of monthly invoice retained			5.00%
Percentage of retention released after one year from commencement of DLP			50.00%
Period after commencement of DLP for release of retention			1 year
Maximum period of DLP			24 months

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property and Equipment
Property and equipment, gross	$ 48,774	$ 47,557
Less accumulated depreciation and amortization	(31,987)	(28,576)
Property and equipment, net	16,787	18,981
Total depreciation expense	4,108	3,556	$ 2,604
Portion charged to cost of services
Property and Equipment
Total depreciation expense	890	813	841
Portion charged to selling, general and administrative expense
Property and Equipment
Total depreciation expense	3,218	2,743	$ 1,763
Furniture and equipment
Property and Equipment
Property and equipment, gross	10,434	9,625
Leasehold improvements
Property and Equipment
Property and equipment, gross	8,615	9,914
Automobiles
Property and Equipment
Property and equipment, gross	844	1,131
Computer equipment and software
Property and Equipment
Property and equipment, gross	$ 28,881	$ 26,887

Intangible Assets - Summary of

Intangible Assets - Summary of Acquired Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Summary of acquired intangible assets
Gross Carrying Amount	$ 21,096	$ 34,176
Accumulated Amortization	14,349	24,403
Intangible assets, net	6,747	9,773
Client relationships
Summary of acquired intangible assets
Gross Carrying Amount	16,699	19,851
Accumulated Amortization	11,298	12,464
Acquired contract rights
Summary of acquired intangible assets
Gross Carrying Amount	2,058	11,801
Accumulated Amortization	1,912	10,832
Trade names
Summary of acquired intangible assets
Gross Carrying Amount	2,339	2,524
Accumulated Amortization	$ 1,139	$ 1,107

Intangible Assets - Estimated A

Intangible Assets - Estimated Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Intangible Assets
Amortization expense related to intangible assets	$ 3,045	$ 4,353	$ 4,500
Estimated amortization expense of intangible assets for the next five years
2,017	2,187
2,018	1,276
2,019	1,189
2,020	928
2,021	$ 542

Goodwill (Details)

Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Summary of changes in carrying value of goodwill during 2016
Balance at the beginning of the period	$ 49,739	$ 53,669
Additions		3,783
Translation adjustments	926	(7,713)
Balance at the end of the period	$ 50,665	$ 49,739

Accounts Payable and Accrued 57

Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Components of accounts payable and accrued expenses
Accounts payable	$ 30,944	$ 38,094
Accrued payroll and related expenses	31,095	35,024
Accrued subcontractor fees	9,188	5,864
Accrued agency fees	5,702	6,282
Accrued legal and professional fees	2,223	1,114
Other accrued expenses	4,840	2,958
Accounts payable and accrued expenses, net	$ 83,992	$ 89,336

Notes Payable and Long-Term D58

Notes Payable and Long-Term Debt - Summary of Outstanding Debt Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Summary of outstanding debt obligations
Long-term Debt, Total	$ 144,103	$ 144,983
Less current maturities	1,983	4,357
Notes payable and long-term debt, net of current maturities	142,120	140,626
Philadelphia Industrial Development Corporation
Summary of outstanding debt obligations
Long-term Debt, Total	655	710
Term loan
Summary of outstanding debt obligations
Long-term Debt, Total	112,884	112,906
Revolving credit facility | U.S. Revolving Credit Facility
Summary of outstanding debt obligations
Long-term Debt, Total	16,500	17,500
Revolving credit facility | International Revolving Credit Facility
Summary of outstanding debt obligations
Long-term Debt, Total	11,102	10,715
Revolving credit facility | Consortium of banks in Spain
Summary of outstanding debt obligations
Long-term Debt, Total	$ 2,962	3,013
Other notes payable
Summary of outstanding debt obligations
Long-term Debt, Total		$ 139

Notes Payable and Long-Term D59

Notes Payable and Long-Term Debt - Term Loan Facilities and Revolving Credit Facilities (Details)	Sep. 26, 2014EUR (€)	Mar. 31, 2017USD ($)	Dec. 31, 2016EUR (€)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 26, 2014USD ($)
Notes Payable and Long-Term Debt
Consent fee for default and increase in interest rate of debt		$ 401,000
Other Foreign Banks
Notes Payable and Long-Term Debt
Maximum borrowing capacity				$ 83,382,000
US Dollar Revolver
Notes Payable and Long-Term Debt
Effective interest rate (as a percent)			6.50%
US Dollar Revolver | LIBOR
Notes Payable and Long-Term Debt
Basis of effective interest rate (as a percent)	3.75%
US Dollar Revolver | Base Rate
Notes Payable and Long-Term Debt
Basis of effective interest rate (as a percent)	2.75%
International Revolver
Notes Payable and Long-Term Debt
Effective interest rate (as a percent)			4.38%
International Revolver | EURIBOR
Notes Payable and Long-Term Debt
Basis of effective interest rate (as a percent)			4.00%
Secured Credit Facilities
Notes Payable and Long-Term Debt
Cash excluded from consolidated net leverage ratio						$ 10,000,000
Debt instrument increase in applicable interest rate for exceeding the consolidated net leverage ratio, as a percent	2.00%
Actual net consolidated leverage ratio			3.89
Consolidated net leverage ratio limit			2.75
Debt instrument increase in applicable interest rate for past due account receivable limit exceeded	2.00%					2.00%
Increase in applicable interest rate upon default (as a percent)	2.00%
Term loan
Notes Payable and Long-Term Debt
Aggregate principal amount						$ 120,000,000
Mandatory prepayment percentage of the excess cash flow for each fiscal year with the first full fiscal year upon the achievement and maintenance of certain metrics	50.00%
Mandatory prepayment percentage of the excess cash flow for each fiscal year with the first full fiscal year upon the achievement net leverage ration is equal to or less than 2.25	25.00%
Consolidated net leverage limit for mandatory prepayment percentage of 25%	2.25
Mandatory prepayment percentage of the excess cash flow for each fiscal year with the first full fiscal year upon the achievement net leverage ration is equal to or less than 1.50	0.00%
Consolidated net leverage limit for mandatory prepayment percentage of 0%	1.50
Term of debt	6 years
Quarterly principal payment, percentage	0.25%					0.25%
Deferred financing fees				7,066,000
Debt issuance costs amortization term	6 years
Unamortized balances of expenses and fees				4,416,000	$ 5,594,000
Effective interest rate (as a percent)			7.75%
Term loan | LIBOR
Notes Payable and Long-Term Debt
Basis of effective interest rate (as a percent)	6.75%
Term loan | LIBOR | Minimum
Notes Payable and Long-Term Debt
Basis of effective interest rate (as a percent)	1.00%
Interest rate (as a percent)	1.00%					1.00%
Term loan | One Month LIBOR
Notes Payable and Long-Term Debt
Basis of effective interest rate (as a percent)	1.00%
Term loan | Base Rate
Notes Payable and Long-Term Debt
Basis of effective interest rate (as a percent)	5.75%
Term loan | Federal Funds effective rate
Notes Payable and Long-Term Debt
Basis of effective interest rate (as a percent)	0.50%
Revolving credit facility
Notes Payable and Long-Term Debt
Term of debt	5 years
Deferred financing fees						$ 3,000,000
Debt issuance costs amortization term	5 years
Revolving credit facility | US Dollar Revolver
Notes Payable and Long-Term Debt
Aggregate principal amount						30,000,000
Maximum borrowing capacity				30,000,000
Unused facility commitment fees percentage	0.50%
Revolving credit facility | International Revolver
Notes Payable and Long-Term Debt
Maximum borrowing capacity	€ 11,765,000		€ 11,765,000	12,380,000		15,000,000
Unused facility commitment fees percentage	0.75%
Percentage of eligible receivables that are subject to a perfected security interest which are used in calculation of borrowing base	85.00%
Percentage of eligible receivables that are not subject to a perfected security interest which are used in calculation of borrowing base	10.00%
Revolving credit facility | International Revolver | Other Foreign Banks | Foreign credit agreements
Notes Payable and Long-Term Debt
Amounts outstanding				945,000
Available borrowing capacity				4,195,000
Revolving credit facility | Other Assets
Notes Payable and Long-Term Debt
Unamortized balances of expenses and fees				1,650,000	$ 2,250,000
Letters of credit | US Dollar Revolver
Notes Payable and Long-Term Debt
Maximum borrowing capacity						25,000,000
Amounts outstanding				4,519,000
Available borrowing capacity				$ 8,981,000
Letters of credit | International Revolver
Notes Payable and Long-Term Debt
Maximum borrowing capacity						$ 10,000,000
Non Permitted Country | Secured Credit Facilities | Maximum
Notes Payable and Long-Term Debt
Percentage of receivables more than 120 days old	10.00%					10.00%
United Arab Emirates | Secured Credit Facilities | Maximum
Notes Payable and Long-Term Debt
Percentage of receivables more than 120 days old	14.00%					14.00%

Notes Payable and Long-Term D60

Notes Payable and Long-Term Debt - Other Debt Arrangements (Details)	Dec. 17, 2016EUR (€)item	Sep. 26, 2014USD ($)	Dec. 31, 2016USD ($)loanfacilityitem	Dec. 31, 2016AED	Dec. 31, 2016EUR (€)	Dec. 31, 2016BRL	Dec. 31, 2016USD ($)
Other Foreign Banks
Description of terms of credit agreement
Maximum borrowing capacity							$ 83,382,000
Letters of credit outstanding							38,680,000
Revolving credit facility
Description of terms of credit agreement
Term of debt		5 years
Revolving credit facility | National Bank of Abu Dhabi
Description of terms of credit agreement
Maximum borrowing capacity				AED 11,500,000			3,131,000
Amounts outstanding							$ 0
Revolving credit facility | National Bank of Abu Dhabi | Emirates InterBank Offered Rate
Description of terms of credit agreement
Reference rate			one-month Emirates InterBank Offer Rate
Basis of effective interest rate (as a percent)			3.00%
Effective interest rate (as a percent)			4.41%
Revolving credit facility | National Bank of Abu Dhabi | Emirates InterBank Offered Rate | Minimum
Description of terms of credit agreement
Interest rate (as a percent)				5.50%	5.50%	5.50%	5.50%
Term loan
Description of terms of credit agreement
Aggregate principal amount		$ 120,000,000
Term of debt		6 years
Effective interest rate (as a percent)			7.75%
Term loan | Philadelphia Industrial Development Corporation
Description of terms of credit agreement
Aggregate principal amount							$ 750,000
Interest rate (as a percent)				2.75%	2.75%	2.75%	2.75%
Term of debt			144 months
Amount payable in each installment			$ 6,121
Letters of credit | National Bank of Abu Dhabi
Description of terms of credit agreement
Maximum borrowing capacity				AED 200,000,000			$ 54,451,000
Letters of credit outstanding				AED 127,377,000			34,686,000
Engineering S.A. | Revolving credit facility
Description of terms of credit agreement
Number of revolving credit lines maintained by Engineering S.A. | item			4
Number of banks involved in revolving credit facility | loanfacility			2
Maximum borrowing capacity							732,000
Amounts outstanding						BRL 2,380,000	$ 0
Weighted average interest rate (as a percent)				5.09%	5.09%	5.09%	5.09%
Period of automatic renewal			3 months
Hill Spain | Revolving credit facility | Consortium of banks in Spain
Description of terms of credit agreement
Interest rate (as a percent)				6.50%	6.50%	6.50%	6.50%
Number of banks involved in revolving credit facility | item	3		6
Maximum borrowing capacity	€ 5,640,000				€ 2,770,000		$ 2,915,000
Hill Spain | Revolving credit facility | Consortium of banks in Spain | Minimum
Description of terms of credit agreement
Interest rate (as a percent)				1.85%	1.85%	1.85%	1.85%
Hill Spain | Revolving credit facility | Consortium of banks in Spain | Maximum
Description of terms of credit agreement
Interest rate (as a percent)				3.50%	3.50%	3.50%	3.50%
Hill Spain | Term loan | Consortium of banks in Spain | Minimum
Description of terms of credit agreement
Term of debt			36 months
Hill Spain | Term loan | Consortium of banks in Spain | Maximum
Description of terms of credit agreement
Term of debt			60 months
Hill Spain | ICO loan | Bankia Bank
Description of terms of credit agreement
Interest rate (as a percent)				6.50%	6.50%	6.50%	6.50%
Maximum borrowing capacity					€ 45,000		$ 47,355
Decrease in amount on quarterly basis | €					15,000
Amounts outstanding					€ 45,000		$ 47,355

Notes Payable and Long-Term D61

Notes Payable and Long-Term Debt - Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
contractually scheduled maturities of long-term debt
2,017	$ 1,983
2,018	1,902
2,019	29,506
2,020	109,834
2,021	520
Thereafter	358
Long-term Debt, Total	$ 144,103	$ 144,983

Supplemental Cash Flow Inform62

Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary of additional cash flow information
Interest and related financing fees paid	$ 12,004	$ 13,180	$ 22,753
Income taxes paid	9,523	5,684	10,863
Increase in property and equipment from a tenant improvement allowance related to the relocation of the corporate headquarters		3,894
Reduction of noncontrolling interest in connection with acquisitions of additional interests in Engineering S.A.			(3,556)
Additional Paid in Capital
Summary of additional cash flow information
Reduction of noncontrolling interest in connection with acquisitions of additional interests in Engineering S.A.		4,374	(907)
Increase in additional paid in capital from issuance of shares of common stock from cashless exercise of stock options	796	361	538
Engineering S.A.
Summary of additional cash flow information
Reduction of noncontrolling interest in connection with acquisitions of additional interests in Engineering S.A.		(4,374)	(2,649)
Engineering S.A. | Additional Paid in Capital
Summary of additional cash flow information
Increase in additional paid in capital from issuance of shares of common stock		4,374
Decrease in additional paid-in capital related to ESA Put Options	$ (2,670)
CPI | Additional Paid in Capital
Summary of additional cash flow information
Increase in additional paid in capital from issuance of shares of common stock		$ 530	$ 618

Share-Based Compensation - Gene

Share-Based Compensation - General (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Options
Outstanding at the beginning of the period (in shares)	7,711,000	7,359,000	6,574,000
Granted (in shares)	1,025,000	1,117,000	1,849,000
Exercised (in shares)	(438,000)	(274,000)	(524,000)
Expired (in shares)	(1,154,000)	(405,000)	(496,000)
Forfeited (in shares)	(82,000)	(86,000)	(44,000)
Outstanding at the end of the period (in shares)	7,062,000	7,711,000	7,359,000
Exercisable at the end of the period (in shares)	3,727,000
Compensation expense	$ 2,436,000	$ 2,960,000	$ 3,292,000
Weighted average assumptions used to estimate the fair value of options granted
Average expected life	4 years 11 months 23 days	4 years 10 months 10 days	4 years 7 months 2 days
Weighted average forfeiture rate (as a percent)	0.00%	0.30%	0.90%
Dividends (as a percent)	0.00%	0.00%	0.00%
Volatility range, minimum (as a percent)	47.40%	46.90%	61.50%
Volatility range, maximum (as a percent)	57.50%	59.90%	65.50%
Weighted average volatility (as a percent)	56.50%	58.90%	62.90%
Range of risk-free interest rates, minimum (as a percent)	0.97%	1.07%	0.86%
Range of risk-free interest rates, maximum (as a percent)	1.46%	1.61%	1.74%
Weighted average risk-free interest rate (as a percent)	1.22%	1.45%	1.67%
Weighted average fair value at grant date (in dollars per share)	$ 1.52	$ 2.01	$ 2.28
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	4.41	4.57	4.67
Granted (in dollars per share)	4.40	4.02	4.57
Exercised (in dollars per share)	2.66	3.03	3
Expired (in dollars per share)	6.81	7.11	7.66
Forfeited (in dollars per share)	4.24	4.50	4.37
Outstanding at the end of the period (in dollars per share)	4.45	$ 4.41	$ 4.57
Exercisable at the end of the period (in dollars per share)	$ 4.64
Weighted Average Remaining Contractual Life
Outstanding at the end of the period	1 year 9 months 11 days
Exercisable at the end of the period	3 years 26 days
Closing stock price (in dollars per share)	$ 4.35
Minimum
Weighted average assumptions used to estimate the fair value of options granted
Forfeiture range (as a percent)		0.00%	0.00%
Maximum
Weighted average assumptions used to estimate the fair value of options granted
Forfeiture range (as a percent)	0.00%	5.00%	5.00%
2008 Employee Stock Purchase Plan
Options
Number of shares covered under the plan	2,000,000
Compensation expense	$ 32,000	$ 22,000	$ 35,000
Purchase price of shares as a percentage of the fair market value on the date of purchase	85.00%
Shares purchased	59,000	43,000	55,000
Aggregate purchase price	$ 182,000	$ 126,000	$ 197,000
Non-Employee Director Stock Grant Plan
Options
Number of shares covered under the plan	400,000
Number of common stock shares issuable for each DSU	1
Shares issued	3,000	25,000	27,000
Compensation expense	$ 10,000	$ 115,000	$ 175,000
Deferred stock units issued	96,000
Compensation expense	$ 350,000
2006 Employee Stock Option Plan
Options
Number of shares covered under the plan	10,000,000
Award vesting period	5 years
Contractual term, non-employee directors	5 years
Contractual term, officers and employees	7 years
Minimum percentage of ownership required for granting options at 110% of closing quoted market price	10.00%
Exercise price as a percentage of closing quoted market price for employees having more than 10 % of outstanding common stock	110.00%
Contractual term of options granted to employees having more than 10 % of outstanding common stock	5 years
Shares of common stock reserved for future issuance under the plan	1,643,000

Share-Based Compensation - Outs

Share-Based Compensation - Outstanding and Exercisable (Details)	12 Months Ended
	Dec. 31, 2016$ / sharesshares
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 4.13
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	7,061,820
Weighted Average Remaining Contractual Life	3 years 26 days
Weighted Average Exercise Price (in dollars per share)	$ 4.13
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	3,726,820
Weighted Average Exercise Price (in dollars per share)	$ 4.64
2.85
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 2.85
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	68,181
Weighted Average Remaining Contractual Life	5 months 9 days
Weighted Average Exercise Price (in dollars per share)	$ 2.85
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	68,181
Weighted Average Exercise Price (in dollars per share)	$ 2.85
2.89
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 2.89
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	69,768
Weighted Average Remaining Contractual Life	1 year 5 months 5 days
Weighted Average Exercise Price (in dollars per share)	$ 2.89
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	69,768
Weighted Average Exercise Price (in dollars per share)	$ 2.89
3
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 3
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	10,101
Weighted Average Remaining Contractual Life	4 years 1 month 6 days
Weighted Average Exercise Price (in dollars per share)	$ 3
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	10,101
Weighted Average Exercise Price (in dollars per share)	$ 3
3.12
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 3.12
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	10,000
Weighted Average Remaining Contractual Life	3 years 7 months 6 days
Weighted Average Exercise Price (in dollars per share)	$ 3.12
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	6,000
Weighted Average Exercise Price (in dollars per share)	$ 3.12
3.35
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 3.35
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	15,000
Weighted Average Remaining Contractual Life	6 years 22 days
Weighted Average Exercise Price (in dollars per share)	$ 3.35
Options Exercisable
Weighted Average Exercise Price (in dollars per share)	3.35
3.46
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 3.46
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	13,274
Weighted Average Remaining Contractual Life	3 years 10 months 10 days
Weighted Average Exercise Price (in dollars per share)	$ 3.46
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	13,274
Weighted Average Exercise Price (in dollars per share)	$ 3.46
3.55
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 3.55
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	5,000
Weighted Average Remaining Contractual Life	5 years 9 months 11 days
Weighted Average Exercise Price (in dollars per share)	$ 3.55
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	1,000
Weighted Average Exercise Price (in dollars per share)	$ 3.55
3.67
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 3.67
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	781,000
Weighted Average Remaining Contractual Life	3 years 22 days
Weighted Average Exercise Price (in dollars per share)	$ 3.67
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	465,000
Weighted Average Exercise Price (in dollars per share)	$ 3.67
3.91
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 3.91
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	500,000
Weighted Average Remaining Contractual Life	5 years 4 days
Weighted Average Exercise Price (in dollars per share)	$ 3.91
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	100,000
Weighted Average Exercise Price (in dollars per share)	$ 3.91
3.95
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 3.95
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	500,000
Weighted Average Remaining Contractual Life	4 years 4 days
Weighted Average Exercise Price (in dollars per share)	$ 3.95
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	200,000
Weighted Average Exercise Price (in dollars per share)	$ 3.95
4
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 4
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	500,000
Weighted Average Remaining Contractual Life	6 years 3 months
Weighted Average Exercise Price (in dollars per share)	$ 4
Options Exercisable
Weighted Average Exercise Price (in dollars per share)	4
4.03
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 4.03
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	475,000
Weighted Average Remaining Contractual Life	5 years 29 days
Weighted Average Exercise Price (in dollars per share)	$ 4.03
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	95,000
Weighted Average Exercise Price (in dollars per share)	$ 4.03
4.04
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 4.04
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	1,000,000
Weighted Average Remaining Contractual Life	1 year 22 days
Weighted Average Exercise Price (in dollars per share)	$ 4.04
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	750,000
Weighted Average Exercise Price (in dollars per share)	$ 4.04
4.31
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 4.31
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	112,500
Weighted Average Remaining Contractual Life	6 years 5 months 12 days
Weighted Average Exercise Price (in dollars per share)	$ 4.31
Options Exercisable
Weighted Average Exercise Price (in dollars per share)	4.31
4.35
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 4.35
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	500,000
Weighted Average Remaining Contractual Life	2 years 4 days
Weighted Average Exercise Price (in dollars per share)	$ 4.35
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	250,000
Weighted Average Exercise Price (in dollars per share)	$ 4.35
4.46
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 4.46
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	25,000
Weighted Average Remaining Contractual Life	6 years 9 months 4 days
Weighted Average Exercise Price (in dollars per share)	$ 4.46
Options Exercisable
Weighted Average Exercise Price (in dollars per share)	4.46
4.84
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 4.84
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	37,974
Weighted Average Remaining Contractual Life	3 years 7 months 6 days
Weighted Average Exercise Price (in dollars per share)	$ 4.84
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	37,974
Weighted Average Exercise Price (in dollars per share)	$ 4.84
4.90
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 4.90
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	10,000
Weighted Average Remaining Contractual Life	5 years 7 months 2 days
Weighted Average Exercise Price (in dollars per share)	$ 4.90
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	2,000
Weighted Average Exercise Price (in dollars per share)	$ 4.90
4.95
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 4.95
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	680,000
Weighted Average Remaining Contractual Life	4 years 2 months 9 days
Weighted Average Exercise Price (in dollars per share)	$ 4.95
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	272,000
Weighted Average Exercise Price (in dollars per share)	$ 4.95
5
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 5
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	250,000
Weighted Average Remaining Contractual Life	6 years 3 months
Weighted Average Exercise Price (in dollars per share)	$ 5
Options Exercisable
Weighted Average Exercise Price (in dollars per share)	5
5.17
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 5.17
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	112,500
Weighted Average Remaining Contractual Life	6 years 5 months 12 days
Weighted Average Exercise Price (in dollars per share)	$ 5.17
Options Exercisable
Weighted Average Exercise Price (in dollars per share)	5.17
5.31
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 5.31
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	20,000
Weighted Average Remaining Contractual Life	26 days
Weighted Average Exercise Price (in dollars per share)	$ 5.31
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	20,000
Weighted Average Exercise Price (in dollars per share)	$ 5.31
5.47
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 5.47
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	880,200
Weighted Average Remaining Contractual Life	2 months 5 days
Weighted Average Exercise Price (in dollars per share)	$ 5.47
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	880,200
Weighted Average Exercise Price (in dollars per share)	$ 5.47
5.73
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 5.73
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	8,000
Weighted Average Remaining Contractual Life	1 year 10 months 2 days
Weighted Average Exercise Price (in dollars per share)	$ 5.73
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	8,000
Weighted Average Exercise Price (in dollars per share)	$ 5.73
5.83
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 5.83
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	265,000
Weighted Average Remaining Contractual Life	2 months 27 days
Weighted Average Exercise Price (in dollars per share)	$ 5.83
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	265,000
Weighted Average Exercise Price (in dollars per share)	$ 5.83
6.31
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 6.31
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	175,000
Weighted Average Remaining Contractual Life	1 year 5 months 1 day
Weighted Average Exercise Price (in dollars per share)	$ 6.31
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	175,000
Weighted Average Exercise Price (in dollars per share)	$ 6.31
6.61
Share-Based Compensation
Exercise Prices (in dollars per share)	$ 6.61
Options Outstanding
Number outstanding at the end of the period (in shares) | shares	38,322
Weighted Average Remaining Contractual Life	2 years 5 months 12 days
Weighted Average Exercise Price (in dollars per share)	$ 6.61
Options Exercisable
Number exercisable at the end of the period (in shares) | shares	38,322
Weighted Average Exercise Price (in dollars per share)	$ 6.61

Share-Based Compensation - Non-

Share-Based Compensation - Non-vested Options (Details) - USD ($) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-Based Compensation
Share-based compensation expense recognized (in dollars)	$ 2,436,000	$ 2,960,000	$ 3,292,000
Options
Non-vested options at the beginning of the period (in shares)	3,654	4,057	3,541
Granted (in shares)	1,025	1,117	1,849
Vested (in shares)	(1,262)	(1,434)	(1,289)
Forfeited (in shares)	(82)	(86)	(44)
Non-vested options at the end of the period (in shares)	3,335	3,654	4,057
Weighted Average Grant Date Fair Value Per Share
Non-vested options at the beginning of the period (in dollars per share)	$ 2.15	$ 2.24	$ 2.20
Granted (in dollars per share)	1.52	2.01	2.28
Vested (in dollars per share)	2.18	2.26	2.19
Forfeited (in dollars per share)	2.76	2.48	2.33
Non-vested options at the end of the period (in dollars per share)	$ 1.92	$ 2.15	$ 2.24
Unrecognized compensation cost
Total unrecognized compensation cost related to non-vested options (in dollars)	$ 4,546,000
Weighted-average service period over which unrecognized compensation cost is to be recognized	1 year 10 months 28 days

Stockholders' Equity (Details)

Stockholders' Equity (Details)	Aug. 12, 2015USD ($)shares	Aug. 06, 2014USD ($)itemshares	Nov. 30, 2015USD ($)shares	Aug. 31, 2015shares	May 31, 2015item$ / sharesshares	Apr. 30, 2015item	Mar. 31, 2014$ / sharesshares	Dec. 31, 2016USD ($)$ / sharesshares	Dec. 31, 2015$ / sharesshares	Dec. 31, 2014$ / sharesshares	Dec. 31, 2013shares
Other disclosures
Weighted average exercise price of options exercised (in dollars per share) | $ / shares								$ 2.66	$ 3.03	$ 3
Cash proceeds from the exercise of stock options | $								$ 351,000
Common Stock Issuance		9,546,629
Sale of common stock | $		$ 38,078,000
Number of mandatory prepayments | item		2
Mandatory prepayment amount | $		$ 9,522,402
Future issuance
Other disclosures
Common Stock Issuance								20,000,000
Former Chairman and Chief Executive Officer
Other disclosures
Options exercised (in shares)							200,000
Weighted average exercise price of options exercised (in dollars per share) | $ / shares							$ 2.70
Withheld shares as payment for the options (in shares)							112,788
Shares received from transaction							87,212
Directors
Other disclosures
Options exercised (in shares)					84,868
Weighted average exercise price of options exercised (in dollars per share) | $ / shares					$ 4.25
Withheld shares as payment for the options (in shares)					67,400
Shares received from transaction					17,468
Number of company's directors | item					4
Officers
Other disclosures
Options exercised (in shares)								320,745
Weighted average exercise price of options exercised (in dollars per share) | $ / shares								$ 2.45
Withheld shares as payment for the options (in shares)								233,752
Shares received from transaction								87,713
Future acquisition
Other disclosures
Stock issued for acquisition (in shares)								6,438,923
Future acquisition | Future issuance
Other disclosures
Stock issued for acquisition (in shares)								20,000,000
BCA and CPI acquisition
Other disclosures
Stock issued for acquisition (in shares)											1,389,769
CPI
Other disclosures
Stock issued for acquisition (in shares)									148,460	171,308
Engineering S.A.
Other disclosures
Number of companies for which common stock will be issued | item						2
Noncontrolling Interest, Ownership Percentage by Parent						19.00%
Shares issued as part of counter offer | $	$ 4,374,000
Shares issued as part of counter offer in number of shares	924,736			924,736
Common stock repurchased (in shares)	129,648		129,648
Common stock repurchased | $	$ 580,000		$ 580,000

Income Taxes - General (Details

Income Taxes - General (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes
Effective income tax rate (as a percent)	(392.30%)	37.90%	35.10%
Income taxes effective tax rates	(392.30%)	37.90%	35.10%
Decrease in reserve for uncertain tax positions	$ 172,000	$ 265,000	$ 2,500,000
Components of earnings (loss) before income taxes
United States	(5,793,000)	(10,963,000)	(11,803,000)
Foreign jurisdictions	4,245,000	28,041,000	33,181,000
Earnings (loss) before income taxes	(1,548,000)	17,078,000	21,378,000
Foreign jurisdictions
Current	6,527,000	6,948,000	8,037,000
Deferred	(459,000)	(483,000)	(525,000)
Total	6,068,000	6,465,000	7,512,000
Income tax (benefit) expense
Current	6,527,000	6,948,000	8,037,000
Deferred	(459,000)	(483,000)	(525,000)
Total	6,068,000	6,465,000	7,512,000
Reconciliation of income taxes based on the statutory U.S. federal income tax and the Company's effective income tax rate
Statutory federal income tax	(542,000)	5,977,000	7,268,000
Foreign tax benefit for earnings taxed at lower rates	3,013,000	(2,939,000)	(3,044,000)
Change in the valuation allowance	3,687,000	7,629,000	17,267,000
Valuation allowance - discontinued operations NOL adjustment	(4,758,000)	(4,192,000)	(11,197,000)
Net liability (reductions) additions for uncertain tax positions	(40,000)	21,000	(2,379,000)
Excess compensation	513,000	485,000	646,000
State and local income taxes, net of federal income tax benefit	(133,000)	(447,000)	(552,000)
Stock options	4,355,000	266,000	224,000
Purchase accounting reversal			(490,000)
Other	(27,000)	(335,000)	(231,000)
Total	6,068,000	6,465,000	$ 7,512,000
Deferred tax assets:
Net operating loss carryforward - U.S. operations	52,401,000	46,493,000
Amortization of intangibles	3,002,000	7,010,000
Net operating loss carryforward - foreign operations	8,459,000	6,690,000
Compensated absences	2,184,000	2,371,000
Foreign income taxes on currency translation	2,632,000	2,392,000
Share based compensation	309,000	3,764,000
Allowance for uncollectible accounts	13,691,000	13,139,000
Bonus accrual		488,000
Foreign tax credit	991,000	982,000
Other	961,000	1,133,000
Total gross deferred tax assets	84,630,000	84,462,000
Valuation allowances	(72,154,000)	(66,043,000)
Net deferred tax assets	12,476,000	18,419,000
Deferred tax liabilities:
Intangible assets	(5,954,000)	(10,763,000)
Depreciation	(3,009,000)	(2,729,000)
Prepaid expenses	(1,021,000)	(1,123,000)
Change in tax method	(101,000)	(190,000)
Accrued expense	(729,000)
Total gross deferred tax liabilities	(10,814,000)	(14,805,000)
Deferred income tax assets	2,197,000	4,602,000
Deferred tax labilities	(535,000)	(988,000)
Net deferred tax assets	$ 1,662,000	$ 3,614,000

Income Taxes - Uncertain Tax Po

Income Taxes - Uncertain Tax Positions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating loss carryforwards
Valuation allowance relating to deferred tax asset	$ 72,154,000	$ 66,043,000
Provision for U.S. taxes on cumulative earnings of foreign subsidiaries	0
Cumulative earnings of foreign subsidiaries	128,175,000
Changes in uncertain tax positions
Balance, beginning of year	996,000	975,000
Reductions based on tax positions related to prior years	(40,000)	(16,000)
Reduction due to settlements with taxing authorities	(172,000)	(265,000)	$ (2,500,000)
Additions based on tax positions related to prior years	914,000	302,000
Balance, end of year	1,698,000	996,000	975,000
Additional disclosures
Accrued interest and penalties related to Accrued interest and penalties related to unrecognized tax benefits	206,000	500,000	$ 520,000
Accumulated Other Comprehensive (Loss)
Operating loss carryforwards
Valuation allowance relating to deferred tax asset	$ 2,424,000
Maximum
Additional disclosures
Period for examination of tax returns for prior years net operating losses utilized in subsequent years's tax returns	3 years
U.S.
Operating loss carryforwards
Additional valuation amount	$ 1,317,000	7,583,000
Valuation allowance related to operating loss carryforwards	50,987,000	49,670,000
Net operating loss carryforwards	132,331,000
State
Operating loss carryforwards
Net operating loss carryforwards	135,234,000
Foreign
Operating loss carryforwards
Deferred tax asset related to net operating losses	36,256,000	27,571,000
Valuation allowance related to operating loss carryforwards	$ 21,167,000	$ 16,373,000

Commitments and Contingencies -

Commitments and Contingencies - Off Balance Sheet Arrangements and Acquisition-Related Contingencies (Details)

Jun. 17, 2016BRLshareholder

Oct. 05, 2015USD ($)

Jun. 15, 2015AED

Jun. 15, 2015USD ($)

Feb. 28, 2011

Apr. 30, 2015shareholder

Apr. 30, 2014shareholder

Dec. 31, 2016USD ($)

Dec. 31, 2015USD ($)

Dec. 31, 2014AED

Dec. 31, 2014USD ($)

Dec. 31, 2013USD ($)

Dec. 31, 2016TRY

Dec. 31, 2016USD ($)

Oct. 31, 2014BRL

Oct. 31, 2014USD ($)

Off Balance Sheet Arrangements

Maximum potential future payment under off-balance sheet arrangements

$ 105,377,000

Cash held as collateral for the issuance of performance and advance payment bonds and letters of credit

$ 4,694,000

4,625,000

Acquisition-Related Contingencies

Potential tax liability related to certain foreign subsidiaries

2,106,000

Discontinued operations | Other liabilities

Acquisition-Related Contingencies

Potential tax liability related to certain foreign subsidiaries

2,106,000

ESA

Off Balance Sheet Arrangements

Number of minority shareholders who exercised Put Option | shareholder

3

Engineering S.A.

Off Balance Sheet Arrangements

Ownership interest acquired (as a percent)

91.00%

Number of minority shareholders who exercised Put Option | shareholder

3

2

Value of shares purchased on exercise of put options

BRL 8,656,000

2,659,000

IMS

Off Balance Sheet Arrangements

Potential future payments in connection with the acquisition

TRY 6,100,000

$ 2,088,000

Increase (decrease) in the contingent consideration

$ (673,000)

$ (673,000)

Plaintiff

General Litigation

Possible loss contingency

$ 8,771,000

Settlement amount

$ 2,596,000

Interest amount

1,056,000

Interest accrued

$ 448,000

Interest amount charged to expense

$ 608,000

Hill Spain | Engineering S.A.

Off Balance Sheet Arrangements

Ownership interest acquired (as a percent)

60.00%

91.00%

91.00%

Multiple of earnings for determining purchase price of minority shares

7

7

7

Call option purchase price premium if exercised by Hill Spain (as a percent)

5.00%

5.00%

Call/put option exercise period after audited financial statements

3 months

3 months

Number of minority shareholders who exercised Put Option | shareholder

2

Value of shares purchased on exercise of put options

BRL 7,838,000

$ 3,556,000

Former executive | Plaintiff

General Litigation

Possible loss contingency

AED 4,536,239

$ 1,210,000

Settlement amount

AED 750,000

$ 200,000

Additional settlement payment

100,000

Legal costs

$ 834,000

Operating Leases (Details)

Operating Leases (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Leases
Rent expense	$ 9,208,000	$ 8,724,000	$ 8,416,000
Operating lease obligations
2,017	7,607,000
2,018	6,213,000
2,019	5,026,000
2,020	3,766,000
2,021	3,145,000
Thereafter	10,963,000
Total	$ 36,720,000

Benefit Plans (Details)

Benefit Plans (Details) - USD ($)	4 Months Ended	12 Months Ended
	Apr. 30, 2012	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Benefit Plans
Age of the employees qualified to participate in the defined contribution plan	21 years
Matching contribution by employer as a percentage of employee compensation		50.00%
Matching contribution by employer as a percentage of employee's considered compensation, maximum		2.00%
Matching contribution by employer, maximum		$ 2,650
Expense related to savings plan recognized		$ 1,005,000	$ 905,000	$ 801,000

Segment and Related Informati72

Segment and Related Information - Consulting Fee Revenue and Total Revenue by Geographic Region (Details)	12 Months Ended
	Dec. 31, 2016USD ($)countryitem	Dec. 31, 2015USD ($)country	Dec. 31, 2014USD ($)country
Consulting Fee Revenue and Total Revenue by Geographic Region:
Consulting Fee Revenue	$ 434,147,000	$ 467,877,000	$ 428,827,000
Consulting fee revenue (as a percent)	100.00%	100.00%	100.00%
Total Revenue	$ 520,847,000	$ 552,576,000	$ 487,754,000
Total revenue (as a percent)	100.00%	100.00%	100.00%
Number of reporting units | item	1
United States
Consulting Fee Revenue and Total Revenue by Geographic Region:
Consulting Fee Revenue	$ 137,528,000	$ 122,423,000	$ 102,095,000
Consulting fee revenue (as a percent)	31.70%	26.20%	23.80%
Total Revenue	$ 204,036,000	$ 187,399,000	$ 146,224,000
Total revenue (as a percent)	39.20%	33.90%	30.00%
Latin America
Consulting Fee Revenue and Total Revenue by Geographic Region:
Consulting Fee Revenue	$ 18,708,000	$ 26,304,000	$ 36,925,000
Consulting fee revenue (as a percent)	4.30%	5.60%	8.60%
Total Revenue	$ 18,774,000	$ 26,351,000	$ 36,948,000
Total revenue (as a percent)	3.60%	4.80%	7.60%
Europe
Consulting Fee Revenue and Total Revenue by Geographic Region:
Consulting Fee Revenue	$ 38,455,000	$ 39,519,000	$ 34,943,000
Consulting fee revenue (as a percent)	8.80%	8.40%	8.20%
Total Revenue	$ 41,242,000	$ 42,913,000	$ 37,358,000
Total revenue (as a percent)	7.90%	7.80%	7.70%
Middle East
Consulting Fee Revenue and Total Revenue by Geographic Region:
Consulting Fee Revenue	$ 204,780,000	$ 245,985,000	$ 222,754,000
Consulting fee revenue (as a percent)	47.20%	52.60%	51.90%
Total Revenue	$ 217,875,000	$ 255,897,000	$ 230,879,000
Total revenue (as a percent)	41.80%	46.30%	47.30%
Africa
Consulting Fee Revenue and Total Revenue by Geographic Region:
Consulting Fee Revenue	$ 20,815,000	$ 20,461,000	$ 18,402,000
Consulting fee revenue (as a percent)	4.80%	4.40%	4.30%
Total Revenue	$ 24,037,000	$ 23,935,000	$ 21,657,000
Total revenue (as a percent)	4.60%	4.30%	4.40%
Asia/Pacific
Consulting Fee Revenue and Total Revenue by Geographic Region:
Consulting Fee Revenue	$ 13,861,000	$ 13,185,000	$ 13,708,000
Consulting fee revenue (as a percent)	3.20%	2.80%	3.20%
Total Revenue	$ 14,883,000	$ 16,081,000	$ 14,688,000
Total revenue (as a percent)	2.90%	2.90%	3.00%
Non - U.S. | Consulting fee revenue | Geographic concentration risk
Consulting Fee Revenue and Total Revenue by Geographic Region:
Number of countries | country	0	0	0
Non - U.S. | Total revenue | Geographic concentration risk
Consulting Fee Revenue and Total Revenue by Geographic Region:
Number of countries | country	0	0	0
United Arab Emirates
Consulting Fee Revenue and Total Revenue by Geographic Region:
Consulting Fee Revenue	$ 70,834,000	$ 86,327,000	$ 48,713,000
Consulting fee revenue (as a percent)	16.30%	18.50%	11.40%
Total Revenue	$ 75,641,000	$ 89,618,000	$ 49,855,000
Total revenue (as a percent)	14.50%	16.20%	10.20%
Saudi Arabia
Consulting Fee Revenue and Total Revenue by Geographic Region:
Consulting Fee Revenue	$ 47,783,000	$ 53,348,000	$ 48,259,000
Consulting fee revenue (as a percent)	11.00%	11.40%	11.30%
Total Revenue			$ 48,919,000
Total revenue (as a percent)			10.00%
Oman
Consulting Fee Revenue and Total Revenue by Geographic Region:
Consulting Fee Revenue		$ 54,243,000	$ 62,337,000
Consulting fee revenue (as a percent)		11.60%	14.50%
Total Revenue		$ 58,390,000	$ 66,175,000
Total revenue (as a percent)		10.60%	13.60%

Segment and Related Informati73

Segment and Related Information - Operating (Loss) Profit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Profit
Operating (loss) profit	$ (854)	$ 19,104	$ 22,942
Corporate
Operating Profit
Operating (loss) profit	(36,251)	(36,816)	(30,232)
United States | Operating segment
Operating Profit
Operating (loss) profit	17,981	14,459	7,424
Latin America | Operating segment
Operating Profit
Operating (loss) profit	(1,687)	1,309	1,418
Europe | Operating segment
Operating Profit
Operating (loss) profit	(4,646)	(6,312)	(5,145)
Middle East | Operating segment
Operating Profit
Operating (loss) profit	20,109	43,792	42,368
Africa | Operating segment
Operating Profit
Operating (loss) profit	1,963	822	4,816
Asia/Pacific | Operating segment
Operating Profit
Operating (loss) profit	$ 1,677	$ 1,850	$ 2,293

Segment and Related Informati74

Segment and Related Information - Depreciation and Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Depreciation and Amortization Expense
Depreciation and amortization expense	$ 7,153	$ 7,909	$ 7,104
Operating segment | Project Management
Depreciation and Amortization Expense
Depreciation and amortization expense	6,535	7,477	6,888
Corporate
Depreciation and Amortization Expense
Depreciation and amortization expense	$ 618	$ 432	$ 216

Segment and Related Informati75

Segment and Related Information - Consulting Fee Revenue and Total Revenue by Client Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consulting Fee Revenue and Total Revenue By Client Type:
Consulting Fee Revenue	$ 434,147	$ 467,877	$ 428,827
Consulting fee revenue (as a percent)	100.00%	100.00%	100.00%
Total Revenue	$ 520,847	$ 552,576	$ 487,754
Total revenue (as a percent)	100.00%	100.00%	100.00%
U.S. federal government
Consulting Fee Revenue and Total Revenue By Client Type:
Consulting Fee Revenue	$ 9,600	$ 8,569	$ 9,792
Consulting fee revenue (as a percent)	2.20%	1.80%	2.30%
Total Revenue	$ 12,046	$ 10,656	$ 12,398
Total revenue (as a percent)	2.30%	1.90%	2.50%
U.S. state, regional and local governments
Consulting Fee Revenue and Total Revenue By Client Type:
Consulting Fee Revenue	$ 94,459	$ 82,181	$ 70,036
Consulting fee revenue (as a percent)	21.80%	17.60%	16.30%
Total Revenue	$ 155,596	$ 138,044	$ 107,247
Total revenue (as a percent)	29.90%	25.00%	22.00%
Foreign governments
Consulting Fee Revenue and Total Revenue By Client Type:
Consulting Fee Revenue	$ 153,445	$ 195,383	$ 193,283
Consulting fee revenue (as a percent)	35.30%	41.80%	45.10%
Total Revenue	$ 168,833	$ 211,907	$ 205,601
Total revenue (as a percent)	32.40%	38.30%	42.20%
Private sector
Consulting Fee Revenue and Total Revenue By Client Type:
Consulting Fee Revenue	$ 176,643	$ 181,744	$ 155,716
Consulting fee revenue (as a percent)	40.70%	38.80%	36.30%
Total Revenue	$ 184,372	$ 191,969	$ 162,508
Total revenue (as a percent)	35.40%	34.80%	33.30%

Segment and Related Informati76

Segment and Related Information - Total Assets and Property, Plant and Equipment, Net by Geographic Region (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment, Net by Geographic Location:
Property, Plant and Equipment, Net by Geographic Location	$ 16,787	$ 18,981
United States
Property, Plant and Equipment, Net by Geographic Location:
Property, Plant and Equipment, Net by Geographic Location	13,024	13,304
Latin America
Property, Plant and Equipment, Net by Geographic Location:
Property, Plant and Equipment, Net by Geographic Location	881	1,017
Europe
Property, Plant and Equipment, Net by Geographic Location:
Property, Plant and Equipment, Net by Geographic Location	218	807
Middle East
Property, Plant and Equipment, Net by Geographic Location:
Property, Plant and Equipment, Net by Geographic Location	1,645	2,318
Africa
Property, Plant and Equipment, Net by Geographic Location:
Property, Plant and Equipment, Net by Geographic Location	169	589
Asia/Pacific
Property, Plant and Equipment, Net by Geographic Location:
Property, Plant and Equipment, Net by Geographic Location	$ 850	$ 946

Schedule II Valuation and Qua77

Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Valuation and Qualifying Accounts
Balance at Beginning of Fiscal Year	$ 60,535	$ 66,119	$ 64,108
Additions (Recoveries) Charged (Credited) to Earnings	14,454	6,262	(5,195)
Other-Allowance Acquired in Business Combinations		120
Uncollectible Receivables Written off, Net of Recoveries	(3,907)	(11,966)	7,206
Balance at End of Fiscal Year	$ 71,082	$ 60,535	$ 66,119