Gran Tierra Energy (GTE) 10-Q 3 May 17 2017 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2017	May 01, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	GRAN TIERRA ENERGY INC.
Entity Central Index Key	1,273,441
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		390,818,790
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
OIL AND NATURAL GAS SALES (NOTE 3)	$ 94,659	$ 57,403
EXPENSES
Operating	23,937	19,067
Transportation	6,942	12,328
Depletion, depreciation and accretion (Note 3)	26,593	36,912
Asset impairment (Notes 3 and 4)	283	56,898
General and administrative (Note 3)	8,712	7,049
Transaction	0	1,237
Severance	0	1,018
Equity tax	1,224	3,051
Foreign exchange (gain) loss	(1,847)	785
Financial instruments (gain) loss (Note 10)	(5,439)	845
Interest expense (Note 5)	3,095	519
Total expenses	63,500	139,709
GAIN ON ACQUISITION	0	11,712
INTEREST INCOME	408	449
INCOME (LOSS) BEFORE INCOME TAXES (NOTE 3)	31,567	(70,145)
INCOME TAX (EXPENSE) RECOVERY
Current	(7,417)	(2,023)
Deferred	(11,379)	27,136
Income tax (expense) recovery	(18,796)	25,113
NET INCOME (LOSS) AND COMPREHENSIVE INCOME (LOSS)	$ 12,771	$ (45,032)
NET INCOME (LOSS) PER SHARE - BASIC AND DILUTED (in dollars per share)	$ 0.03	$ (0.15)
WEIGHTED AVERAGE SHARES OUTSTANDING - BASIC (Note 6)	399,007,086	293,812,226
WEIGHTED AVERAGE SHARES OUTSTANDING - DILUTED (Note 6)	399,046,114	293,812,226

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents (Note 11)	$ 26,716	$ 25,175
Restricted cash and cash equivalents (Notes 7 and 11)	7,663	8,322
Accounts receivable	46,912	45,698
Derivatives (Note 10)	1,425	578
Inventory (Note 4)	7,285	7,766
Taxes receivable	23,284	26,393
Prepaid taxes (Note 2)	0	12,271
Other prepaids	4,404	5,482
Total Current Assets	117,689	131,685
Oil and Gas Properties (using the full cost method of accounting)
Proved	460,937	412,319
Unproved	620,045	647,774
Total Oil and Gas Properties	1,080,982	1,060,093
Other capital assets	6,314	6,516
Total Property, Plant and Equipment (Notes 3 and 4)	1,087,296	1,066,609
Other Long-Term Assets
Deferred tax assets (Note 2)	100,260	1,611
Prepaid taxes (Note 2)	0	41,784
Other long-term assets (Note 11)	24,467	23,626
Goodwill (Note 3)	102,581	102,581
Total Other Long-Term Assets	227,308	169,602
Total Assets	1,432,293	1,367,896
Current Liabilities
Accounts payable and accrued liabilities	112,414	107,051
Derivatives (Note 10)	0	3,824
Taxes payable (Note 2)	38,210	38,939
Asset retirement obligation (Note 7)	1,214	5,215
Total Current Liabilities	151,838	155,029
Long-Term Liabilities
Long-term debt (Notes 5 and 10)	193,159	197,083
Deferred tax liabilities (Note 2)	36,061	107,230
Asset retirement obligation (Note 7)	42,960	38,142
Other long-term liabilities	11,332	11,425
Total Long-Term Liabilities	283,512	353,880
Contingencies (Note 9)
Shareholders’ Equity
Common Stock (Note 6) (390,815,190 and 390,807,194 shares of Common Stock and 8,191,894 and 8,199,894 exchangeable shares, par value $0.001 per share, issued and outstanding as at March 31, 2017, and December 31, 2016, respectively)	10,303	10,303
Additional paid in capital	1,343,365	1,342,656
Deficit	(356,725)	(493,972)
Total Shareholders’ Equity	996,943	858,987
Total Liabilities and Shareholders’ Equity	$ 1,432,293	$ 1,367,896

Condensed Consolidated Balance4

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common shares, issued	390,815,190	390,807,194
Common shares, outstanding	390,815,190	390,807,194
Exchangeable shares, issued	8,191,894	8,199,894
Exchangeable shares, outstanding	8,191,894	8,199,894
Common shares, par value (in dollars per share)	$ 0.001	$ 0.001

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Activities
Net income (loss)	$ 12,771	$ (45,032)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depletion, depreciation and accretion (Note 3)	26,593	36,912
Asset impairment (Notes 3 and 4)	283	56,898
Deferred tax expense (recovery)	11,379	(27,136)
Stock-based compensation (Note 6)	1,203	1,460
Amortization of debt issuance costs (Note 5)	605	140
Cash settlement of restricted share units	(318)	(673)
Unrealized foreign exchange gain	(2,819)	(183)
Financial instruments (gain) loss (Note 10)	(5,439)	845
Cash settlement of financial instruments (Note 10)	768	44
Cash settlement of asset retirement obligation (Note 7)	(13)	(104)
Gain on acquisition	0	(11,712)
Net change in assets and liabilities from operating activities (Note 11)	4,930	(647)
Net cash provided by operating activities	49,943	10,812
Investing Activities
Additions to property, plant and equipment, excluding corporate acquisition (Note 3)	(46,160)	(26,180)
Additions to property, plant and equipment - acquisition of PetroGranada Colombia Limited	0	(19,388)
Deposit received for Brazil Divestiture (Note 1)	3,500	0
Cash paid for business combinations, net of cash acquired	0	(40,201)
Changes in non-cash investing working capital	(1,797)	50
Net cash used in investing activities	(44,457)	(85,719)
Financing Activities
Proceeds from bank debt, net of issuance costs (Note 5)	18,471	0
Repayment of bank debt (Note 5)	(23,000)	0
Proceeds from issuance of shares of Common Stock, net of issuance costs	0	1,198
Net cash (used in) provided by financing activities	(4,529)	1,198
Foreign exchange gain on cash, cash equivalents and restricted cash and cash equivalents	474	1,154
Net increase (decrease) in cash, cash equivalents and restricted cash and cash equivalents	1,431	(72,555)
Cash, cash equivalents and restricted cash and cash equivalents, beginning of period (Note 11)	43,267	148,751
Cash, cash equivalents and restricted cash and cash equivalents, end of period (Note 11)	$ 44,698	$ 76,196

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Share Capital	Additional Paid in Capital	Deficit
Increase (Decrease) in Stockholders' Equity
Cumulative adjustment for accounting change related to tax reorganizations (Note 2)				$ 0
Balance, beginning of period at Dec. 31, 2015		$ 10,186	$ 1,019,863	(28,407)
Increase (Decrease) in Stockholders' Equity
Issuance of Common Stock, net of share issuance costs (Note 6)		117	314,425
Exercise of stock options (Note 6)			5,347
Stock-based compensation (Note 6)			3,021
Net income (loss)				(465,565)
Balance, end of period at Dec. 31, 2016	$ 858,987	10,303	1,342,656	(493,972)
Increase (Decrease) in Stockholders' Equity
Cumulative adjustment for accounting change related to tax reorganizations (Note 2)				124,476
Issuance of Common Stock, net of share issuance costs (Note 6)		0	0
Exercise of stock options (Note 6)			0
Stock-based compensation (Note 6)			709
Net income (loss)	12,771			12,771
Balance, end of period at Mar. 31, 2017	$ 996,943	$ 10,303	$ 1,343,365	$ (356,725)

Description of Business

Description of Business	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Gran Tierra Energy Inc., a Delaware corporation (the “Company” or “Gran Tierra”), is a publicly traded company focused on oil and natural gas exploration and production in Colombia. The Company also has business activities in Peru and Brazil. On February, 6, 2017, the Company announced that a purchase and sale agreement (the "Agreement") had been executed by a third party ("Purchaser") to purchase Gran Tierra's Brazil business unit through the acquisition of all of the equity interests in one of Gran Tierra's indirect subsidiaries, and the assignment of certain debt owed by the corporate entities comprising Gran Tierra's Brazil business unit to the Gran Tierra group of companies (the "Brazil Divestiture"). Upon completion of the Brazil Divestiture, the Purchaser will acquire all of Gran Tierra's assets and certain liabilities in Brazil, including its 100% working interest in the Tiê Field and all of Gran Tierra's interest in exploration rights and obligations held pursuant to concession agreements granted by the Agência Nacional do Petróleo, Gás Natural e Biocombustíveis of Brazil ("ANP"). The completion of the Brazil Divestiture is subject to the Purchaser obtaining financing, as well as customary closing conditions, including the receipt of required regulatory approval from the ANP. The consideration to be received by Gran Tierra on the completion of the Brazil Divestiture is $35 million , subject to adjustments, plus the assumption by the Purchaser of certain existing and potential liabilities of Gran Tierra's Brazil business unit. Pursuant to the Agreement, the Purchaser paid a deposit of $3.5 million on February 7, 2017, which is not refundable in the event the Purchaser is not successful in obtaining financing to complete the Brazil Divestiture. The economic effective date of the transaction would be on or before August 1, 2017, and Gran Tierra will continue to operate its Brazil business unit until the completion of the Brazil Divestiture.

Significant Accounting Policies

Significant Accounting Policies	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Significant Accounting Policies	Significant Accounting Policies These interim unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”). The information furnished herein reflects all normal recurring adjustments that are, in the opinion of management, necessary for the fair presentation of results for the interim periods. The note disclosure requirements of annual consolidated financial statements provide additional disclosures to that required for interim unaudited condensed consolidated financial statements. Accordingly, these interim unaudited condensed consolidated financial statements should be read in conjunction with the Company’s consolidated financial statements as at and for the year ended December 31, 2016 , included in the Company’s 2016 Annual Report on Form 10-K, filed with the SEC on March 1, 2017 . The Company’s significant accounting policies are described in Note 2 of the consolidated financial statements which are included in the Company’s 2016 Annual Report on Form 10-K and are the same policies followed in these interim unaudited condensed consolidated financial statements, except as noted below. The Company has evaluated all subsequent events through to the date these interim unaudited condensed consolidated financial statements were issued. Recently Adopted Accounting Pronouncements Simplifying the Measurement of Inventory In July 2015, the FASB issued ASU 2015-11, “Simplifying the Measurement of Inventory". The ASU provides guidance for the subsequent measurement of inventory and requires that inventory that is measured using average cost be measured at the lower of cost and net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. The ASU was effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. The implementation of this update did not materially impact the Company’s consolidated financial position, results of operations or cash flows or disclosure. Employee Share-Based Payment Accounting In March 2016, the FASB issued ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting ". This ASU simplifies several aspects of the accounting for employee share-based payment transactions, including the accounting for forfeitures, income taxes, and statutory tax withholding requirements. The ASU was effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. The Company elected to continue to estimate the total number of awards for which the requisite service period will not be rendered. The implementation of this update did not impact the Company’s consolidated financial position, results of operations or cash flows or disclosure. Income Taxes - Intra-Entity Transfers of Assets Other than Inventory At December 31, 2016, GAAP prohibited the recognition of current and deferred income taxes for intra-entity transfers until an asset leaves the consolidated group, therefore, the current income tax effect of tax reorganizations completed in 2016 was deferred and recognized as prepaid income taxes. At December 31, 2016, the Company's balance sheet included $54.1 million of prepaid income taxes, $12.3 million in current prepaid taxes and $41.8 million in long-term prepaid taxes, and $37.5 million of current income taxes payable relating to tax reorganizations completed in 2016. In October 2016, the FASB issued ASU 2016-16, "Intra-Entity Transfers of Assets Other than Inventory." This ASU requires companies to recognize the income tax effects of intercompany sales or transfers of assets, other than inventory, in the income statement as income tax expense or benefit in the period the sale or transfer occurs. This ASU is effective for fiscal years beginning after December 15, 2017, and interim periods within those years. Early adoption was permitted as of the beginning of an annual reporting period. The ASU is required to be applied on a modified retrospective basis with a cumulative-effect adjustment directly to retained earnings in the period of adoption. The Company early adopted this ASU on January 1, 2017, and in the three months ending March 31, 2017, wrote off the income tax effects that had been deferred from past intercompany transactions to opening deficit. Prepaid tax of $54.1 million and deferred tax assets of $178.6 million were recorded directly to opening deficit at January 1, 2017. Deferred tax assets recorded upon adoption were assessed for realizability under ASC 740, and, valuation allowances were recognized on those deferred tax assets as necessary on the date of adoption. The adoption of ASU 2016-16 did not have any effect on the Company’s cash flows. Restricted Cash and Cash Equivalents In November 2016, the FASB issued ASU 2016-18, "Restricted Cash". ASU 2016-18 requires that a statement of cash flows explain the change during the period in the total cash, cash equivalents and amounts generally described as restricted cash or restricted cash equivalents. ASU 2016-18 is effective for annual reporting periods and interim reporting periods within those annual reporting periods, beginning after December 15, 2017. The ASU was adopted on a retrospective basis to each period presented. The implementation of this ASU did not impact the Company's consolidated financial position or results of operations, and did not have a material impact on net cash used in investing activities for the three months ended March 31, 2017 , or 2016. Clarifying the Definition of a Business In January 2017, the FASB issued ASU 2017-01, "Clarifying the Definition of a Business". ASU 2017-01 narrows the definition of a business and provides a framework that gives entities a basis for making reasonable judgments about whether a transaction involves an asset or a business. ASU 2017-01 is effective for annual reporting periods and interim reporting periods within those annual reporting periods, beginning after December 15, 2017. Early adoption was permitted and the Company adopted this ASU on January 1, 2017. The Company now applies an initial screen for determining whether a transaction involves an asset or a business. When substantially all of the fair value of the gross assets acquired is concentrated in a single identified asset, or group of similar identifiable assets, the set will not be a business and no goodwill or gain on acquisition will be recognized. If the screen is not met, a set cannot be considered a business unless it includes an input and a substantive process that together significantly contribute to the ability to create an output. Simplifying the Test for Goodwill Impairment In January 2017, the FASB issued ASU 2017-04, "Simplifying the Test for Goodwill Impairment". ASU 2017-04 eliminates step 2 of the goodwill impairment test. An entity no longer will determine goodwill impairment by calculating the implied fair value of goodwill by assigning the fair value of a reporting unit to all of its assets and liabilities as if that reporting unit had been acquired in a business combination. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. ASU 2017-04 is effective for annual reporting periods and interim reporting periods within those annual reporting periods, beginning after December 15, 2019. Early adoption is permitted. At December 31, 2016, the Company performed a qualitative assessment of goodwill and, based on this assessment, no impairment of goodwill was identified. The Company did not have to perform step 2 of the goodwill impairment test.

Segment and Geographic Reportin

Segment and Geographic Reporting	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Segment and Geographic Reporting	Segment and Geographic Reporting The Company is primarily engaged in the exploration and production of oil and natural gas. The Company’s reportable segments are Colombia, Peru and Brazil based on geographic organization. The All Other category represents the Company’s corporate activities. The Company evaluates reportable segment performance based on income or loss before income taxes. On February, 6, 2017, the Company announced that a purchase and sale agreement had been executed by the Purchaser to purchase Gran Tierra's Brazil business unit through the acquisition of all of the equity interests in one of Gran Tierra's indirect subsidiaries, and the assignment of certain debt owed by the corporate entities comprising Gran Tierra's Brazil business unit to the Gran Tierra group of companies (Note 1). The completion of the sale is subject to the Purchaser obtaining financing, as well as customary closing conditions, including the receipt of required regulatory approval from the ANP. The following tables present information on the Company’s reportable segments and other activities: Three Months Ended March 31, 2017 (Thousands of U.S. Dollars) Colombia Peru Brazil All Other Total Oil and natural gas sales $ 90,464 $ — $ 4,195 $ — $ 94,659 Depletion, depreciation and accretion 24,935 226 1,213 219 26,593 Asset impairment — 283 — — 283 General and administrative expenses 4,832 355 305 3,220 8,712 Income (loss) before income taxes 37,144 (513 ) 1,520 (6,584 ) 31,567 Segment capital expenditures 42,840 1,207 1,749 364 46,160 Three Months Ended March 31, 2016 (Thousands of U.S. Dollars) Colombia Peru Brazil All Other Total Oil and natural gas sales $ 56,300 $ — $ 1,103 $ — $ 57,403 Depletion, depreciation and accretion 35,736 141 718 317 36,912 Asset impairment 55,232 416 1,250 — 56,898 General and administrative expenses 3,265 409 292 3,083 7,049 (Loss) income before income taxes (72,721 ) (712 ) (1,509 ) 4,797 (70,145 ) Segment capital expenditures 21,986 1,268 2,720 206 26,180 As at March 31, 2017 (Thousands of U.S. Dollars) Colombia Peru Brazil All Other Total Property, plant and equipment $ 958,977 $ 69,325 $ 55,810 $ 3,184 $ 1,087,296 Goodwill 102,581 — — — 102,581 All other assets 211,693 11,111 3,559 16,053 242,416 Total Assets $ 1,273,251 $ 80,436 $ 59,369 $ 19,237 $ 1,432,293 As at December 31, 2016 (Thousands of U.S. Dollars) Colombia Peru Brazil All Other Total Property, plant and equipment $ 939,947 $ 68,428 $ 55,196 $ 3,038 $ 1,066,609 Goodwill 102,581 — — — 102,581 All other assets 177,393 10,848 1,619 8,846 198,706 Total Assets $ 1,219,921 $ 79,276 $ 56,815 $ 11,884 $ 1,367,896

Property, Plant and Equipment a

Property, Plant and Equipment and Inventory	3 Months Ended
	Mar. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment and Inventory	Property, Plant and Equipment and Inventory Property, Plant and Equipment (Thousands of U.S. Dollars) As at March 31, 2017 As at December 31, 2016 Oil and natural gas properties Proved $ 2,725,784 $ 2,652,171 Unproved 620,045 647,774 3,345,829 3,299,945 Other 29,744 29,445 3,375,573 3,329,390 Accumulated depletion, depreciation and impairment (2,288,277 ) (2,262,781 ) $ 1,087,296 $ 1,066,609 Asset impairment for the three months ended March 31, 2017 , and 2016 was as follows: Three Months Ended March 31, (Thousands of U.S. Dollars) 2017 2016 Impairment of oil and gas properties $ 283 $ 56,234 Impairment of inventory — 664 $ 283 $ 56,898 In the three months ended March 31, 2017 and 2016 , the Company recorded impairment losses in its Peru cost center of $0.3 million and $0.4 million , respectively. In the three months ended March 31, 2017 , the Company had no ceiling test impairment losses in its Colombia and Brazil cost centers. In the three months ended March 31, 2016 , the Company recorded ceiling test impairment losses of $54.6 million and $1.3 million , respectively, in its Colombia and Brazil cost centers, as a result of low realized oil prices. The Company follows the full cost method of accounting for its oil and gas properties. Under this method, the net book value of properties on a country-by-country basis, less related deferred income taxes, may not exceed a calculated “ceiling”. The ceiling is the estimated after tax future net revenues from proved oil and gas properties, discounted at 10% per year. In calculating discounted future net revenues, oil and natural gas prices are determined using the average price during the 12 months period prior to the ending date of the period covered by the balance sheet, calculated as an unweighted arithmetic average of the first-day-of-the month price for each month within such period for that oil and natural gas. That average price is then held constant, except for changes which are fixed and determinable by existing contracts. Therefore, ceiling test estimates are based on historical prices discounted at 10% per year and it should not be assumed that estimates of future net revenues represent the fair market value of the Company's reserves. In accordance with GAAP, Gran Tierra used an average Brent price of $49.33 per bbl for the purposes of the March 31, 2017 , ceiling test calculations ( December 31, 2016 - $42.92 ; March 31, 2016 - $48.79 ; December 31, 2015 - $54.08 ). Inventory At March 31, 2017 , oil and supplies inventories were $5.5 million and $1.8 million , respectively ( December 31, 2016 - $6.0 million and $1.8 million , respectively). At March 31, 2017 , the Company had 185 Mbbl of oil inventory ( December 31, 2016 - 208 Mbbl). In the three months ended March 31, 2017 , the Company recorded oil inventory impairment of $ nil ( three months ended March 31, 2016 - $ 0.7 million ) related to lower oil prices.

Debt and Debt Issuance Costs

Debt and Debt Issuance Costs	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Debt and Debt Issuance Costs	Debt and Debt Issuance Costs The Company's debt at March 31, 2017 , and December 31, 2016 , was as follows: (Thousands of U.S. Dollars) As at March 31, 2017 As at December 31, 2016 Convertible senior notes $ 115,000 $ 115,000 Revolving credit facility 85,000 90,000 Unamortized debt issuance costs (6,841 ) (7,917 ) Long-term debt $ 193,159 $ 197,083 The following table presents total interest expense recognized in the accompanying interim unaudited condensed consolidated statements of operations: Three Months Ended March 31, (Thousands of U.S. Dollars) 2017 2016 Contractual interest and other financing expenses $ 2,490 $ 379 Amortization of debt issuance costs 605 140 $ 3,095 $ 519

Share Capital

Share Capital	3 Months Ended
	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share Capital	Share Capital The Company’s authorized share capital consists of 595,000,002 shares of capital stock, of which 570 million are designated as Common Stock, par value $0.001 per share, 25 million are designated as Preferred Stock, par value $0.001 per share, one share is designated as Special A Voting Stock, par value $0.001 per share, and one share is designated as Special B Voting Stock, par value $0.001 per share. Shares of Common Stock Exchangeable Shares of Gran Tierra Exchangeco Inc. Exchangeable Shares of Gran Tierra Goldstrike Inc. Balance, December 31, 2016 390,807,194 4,812,592 3,387,302 Exchange of exchangeable shares 8,000 (8,000 ) — Shares canceled (4 ) — — Balance, March 31, 2017 390,815,190 4,804,592 3,387,302 Net Income (Loss) per Share Basic net income (loss) per share is calculated by dividing net income (loss) attributable to common shareholders by the weighted average number of shares of Common Stock and exchangeable shares issued and outstanding during each period. Diluted net income (loss) per share is calculated by adjusting the weighted average number of shares of Common Stock and exchangeable shares outstanding for the dilutive effect, if any, of share equivalents. The Company uses the treasury stock method to determine the dilutive effect. This method assumes that all Common Stock equivalents have been exercised at the beginning of the period (or at the time of issuance, if later), and that the funds obtained thereby were used to purchase shares of Common Stock of the Company at the volume weighted average trading price of shares of Common Stock during the period. Stock options and shares issuable upon conversion of the Convertible Senior Notes ("Notes") were excluded from the diluted loss per share calculation as the stock options and shares issuable upon conversion of the Notes were anti-dilutive. Equity Compensation Awards The following table provides information about p erformance stock units (“PSUs”), deferred share units (“DSUs”), restricted stock units (“RSUs”) and stock option activity for the three months ended March 31, 2017 : PSUs DSUs RSUs Stock Options Number of Outstanding Share Units Number of Outstanding Share Units Number of Outstanding Share Units Number of Outstanding Stock Options Weighted Average Exercise Price/Stock Option ($) Balance, December 31, 2016 3,362,717 208,698 359,145 9,239,478 4.16 Granted 3,098,100 48,337 — 1,819,380 2.57 Exercised — — (123,326 ) — — Forfeited — — (2,558 ) (21,595 ) (5.71 ) Balance, March 31, 2017 6,460,817 257,035 233,261 11,037,263 3.90 Stock-based compensation expense for the three months ended March 31, 2017 , and 2016 , was $1.2 million and $1.5 million , respectively, and was primarily recorded in general and administrative ("G&A") expenses. At March 31, 2017 , there was $16.7 million ( December 31, 2016 - $10.0 million ) of unrecognized compensation cost related to unvested PSUs, RSUs and stock options which is expected to be recognized over a weighted average period of 2.2 years. Weighted Average Shares Outstanding Three Months Ended March 31, 2017 2016 Weighted average number of common and exchangeable shares outstanding 399,007,086 293,812,226 Shares issuable pursuant to stock options 635,484 — Shares assumed to be purchased from proceeds of stock options (596,456 ) — Weighted average number of diluted common and exchangeable shares outstanding 399,046,114 293,812,226 For the three months ended March 31, 2017 , 9,210,869 options, on a weighted average basis, ( 2016 - 12,667,761 options) were excluded from the diluted income (loss) per share calculation as the options were anti-dilutive.

Asset Retirement Obligation

Asset Retirement Obligation	3 Months Ended
	Mar. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligation	Asset Retirement Obligation Changes in the carrying amounts of the asset retirement obligation associated with the Company’s oil and natural gas properties were as follows: Three Months Ended Year Ended (Thousands of U.S. Dollars) March 31, 2017 December 31, 2016 Balance, beginning of period $ 43,357 $ 33,224 Settlements (195 ) (872 ) Liabilities associated with assets sold — (3,257 ) Liability incurred 190 2,606 Liabilities assumed in acquisition — 15,723 Accretion 822 2,789 Revisions in estimated liability — (6,856 ) Balance, end of period $ 44,174 $ 43,357 Asset retirement obligation - current $ 1,214 $ 5,215 Asset retirement obligation - long-term 42,960 38,142 $ 44,174 $ 43,357 For the three months ended March 31, 2017 , settlements included $ nil cash payments with the balance in accounts payable and accrued liabilities at March 31, 2017 . Revisions in estimated liabilities relate primarily to changes in estimates of asset retirement costs and include, but are not limited to, revisions of estimated inflation rates, changes in property lives and the expected timing of settling asset retirement obligations. At March 31, 2017 , the fair value of assets that are legally restricted for purposes of settling the asset retirement obligation was $12.6 million ( December 31, 2016 - $12.0 million ). These assets are accounted for as restricted cash and cash equivalents on the Company's interim unaudited condensed consolidated balance sheets.

Taxes

Taxes	3 Months Ended
	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Taxes	Taxes The Company's effective tax rate was 60% in the three months ended March 31, 2017 , compared with 36% in the corresponding period in 2016 . The Company's effective tax rate differed from the U.S. statutory rate of 35% primarily due to an increase to the valuation allowance, which was largely attributable to losses incurred in the United States, Brazil and Colombia, as well as the impact of a non-deductible third-party royalty in Colombia, foreign taxes, local taxes, and stock based compensation. These items were partially offset by foreign currency translation adjustments and other permanent differences.

Contingencies

Contingencies	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies The Agencia Nacional de Hidrocarburos (National Hydrocarbons Agency) (“ANH") and Gran Tierra are engaged in ongoing discussions regarding the interpretation of whether certain transportation and related costs are eligible to be deducted in the calculation of an additional royalty (the "HPR royalty"). Based on the Company's understanding of the ANH's position, the estimated compensation which would be payable if the ANH’s interpretation is correct could be up to $46.4 million as at March 31, 2017 . At this time no amount has been accrued in the interim unaudited condensed consolidated financial statements as Gran Tierra does not consider it probable that a loss will be incurred. In addition to the above, Gran Tierra has a number of other lawsuits and claims pending. Although the outcome of these other lawsuits and disputes cannot be predicted with certainty, Gran Tierra believes the resolution of these matters would not have a material adverse effect on the Company’s consolidated financial position, results of operations or cash flows. Gran Tierra records costs as they are incurred or become probable and determinable. Letters of credit and other credit support At March 31, 2017 , the Company had provided letters of credit and other credit support totaling $88.3 million ( December 31, 2016 - $96.8 million ) as security relating to work commitment guarantees contained in exploration contracts and other capital or operating requirements.

Financial Instruments and Fair

Financial Instruments and Fair Value Measurement	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Financial Instruments and Fair Value Measurement	Financial Instruments and Fair Value Measurement Financial Instruments At March 31, 2017 , the Company’s financial instruments recognized in the balance sheet consist of: cash and cash equivalents; restricted cash and cash equivalents; accounts receivable; derivatives, accounts payable and accrued liabilities, long-term debt, PSU liability included in other long-term liabilities, and RSU liability included in accounts payable and accrued liabilities and other long-term liabilities. Fair Value Measurement The fair value of derivatives and RSU and PSU liabilities are being remeasured at the estimated fair value at the end of each reporting period. The fair value of commodity price and foreign currency derivatives is estimated based on various factors, including quoted market prices in active markets and quotes from third parties. The Company also performs an internal valuation to ensure the reasonableness of third party quotes. In consideration of counterparty credit risk, the Company assessed the possibility of whether the counterparty to the derivative would default by failing to make any contractually required payments. Additionally, the Company considers that it is of substantial credit quality and has the financial resources and willingness to meet its potential repayment obligations associated with the derivative transactions. The fair value of the RSU liability was estimated based on quoted market prices in an active market. The fair value of the PSU liability was estimated based on quoted market prices in an active market and an option pricing model such as the Monte Carlo simulation option-pricing models. The fair value of derivatives, and RSU and PSU liabilities at March 31, 2017 , and December 31, 2016 , were as follows: (Thousands of U.S. Dollars) As at March 31, 2017 As at December 31, 2016 Commodity price derivative asset $ 879 $ — Foreign currency derivative asset 546 578 $ 1,425 $ 578 Commodity price derivative liability $ — $ 3,824 RSU, PSU and DSU liability 4,197 3,907 $ 4,197 $ 7,731 The following table presents gains or losses on financial instruments recognized in the accompanying interim unaudited condensed consolidated statements of operations: Three Months Ended March 31, (Thousands of U.S. Dollars) 2017 2016 Commodity price derivative gain $ (4,703 ) $ — Foreign currency derivatives gain (736 ) — Trading securities loss — 845 Financial instruments (gain) loss $ (5,439 ) $ 845 These gains and losses are presented as financial instruments gains or losses in the interim unaudited condensed consolidated statements of operations and cash flows. Financial instruments not recorded at fair value include the Notes. At March 31, 2017 , the carrying amount of the Notes was $110.1 million , which represents the aggregate principal amount less unamortized debt issuance costs, and the fair value was $128.5 million . The fair value of long-term restricted cash and cash equivalents and the revolving credit facility approximated their carrying value because interest rates are variable and reflective of market rates. The fair values of other financial instruments approximate their carrying amounts due to the short-term maturity of these instruments. GAAP establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. This hierarchy consists of three broad levels. Level 1 inputs consist of quoted prices (unadjusted) in active markets for identical assets and liabilities and have the highest priority. Level 2 and 3 inputs are based on significant other observable inputs and significant unobservable inputs, respectively, and have lower priorities. The Company uses appropriate valuation techniques based on the available inputs to measure the fair values of assets and liabilities. At March 31, 2017 , the fair value of the derivatives was determined using Level 2 inputs and the fair value of the PSU liability was determined using Level 3 inputs. The Company uses available market data and valuation methodologies to estimate the fair value of debt. The fair value of debt is the estimated amount the Company would have to pay a third party to assume the debt, including a credit spread for the difference between the issue rate and the period end market rate. The credit spread is the Company’s default or repayment risk. The credit spread (premium or discount) is determined by comparing the Company’s Notes and revolving credit facility to new issuances (secured and unsecured) and secondary trades of similar size and credit statistics for both public and private debt. The disclosure in the paragraph above regarding the fair value of the Company’s revolving credit facility was determined using an income approach using Level 3 inputs. The disclosure in the paragraph above regarding the fair value of the Notes was determined using Level 2 inputs based on the indicative pricing published by certain investment banks or trading levels of the Notes, which are not listed on any securities exchange or quoted on an inter-dealer automated quotation system. The disclosure in the paragraph above regarding the fair value of cash and cash equivalents and restricted cash and cash equivalents was based on Level 1 inputs. The Company’s non-recurring fair value measurements include asset retirement obligations. The fair value of an asset retirement obligation is measured by reference to the expected future cash outflows required to satisfy the retirement obligation discounted at the Company’s credit-adjusted risk-free interest rate. The significant level 3 inputs used to calculate such liabilities include estimates of costs to be incurred, the Company’s credit-adjusted risk-free interest rate, inflation rates and estimated dates of abandonment. Accretion expense is recognized over time as the discounted liabilities are accreted to their expected settlement value, while the asset retirement cost is amortized over the estimated productive life of the related assets. Commodity Price Derivatives The Company utilizes commodity price derivatives to manage the variability in cash flows associated with the forecasted sale of its oil production, reduce commodity price risk and provide a base level of cash flow in order to assure it can execute at least a portion of its capital spending. At March 31, 2017 , the Company had outstanding commodity price derivative positions as follows: Period and type of instrument Volume, Reference Sold Put ($/bbl) Purchased Put Sold Call ($/bbl) Collar: June 1, 2016 to May 31, 2017 10,000 ICE Brent $ 35 $ 45 $ 65 Collar: October 1, 2016 to December 31, 2017 5,000 ICE Brent $ 35 $ 45 $ 65 Collar: June 1, 2017 to December 31, 2017 10,000 ICE Brent $ 35 $ 45 $ 65 Foreign Currency Derivatives The Company utilizes foreign currency derivatives to manage the variability in cash flows associated with the Company's forecasted Colombian peso ("COP") denominated costs. At March 31, 2017 , the Company had outstanding foreign currency derivative positions as follows: Period and type of instrument Amount Hedged U.S. Dollar Equivalent of Amount Hedged (1) (Thousands of U.S. Dollars) Reference Purchased Call Sold Put Collar: April 1, 2017 to May 31, 2017 22,697 7,881 COP 3,100 3,340 (1) At March 31, 2017 foreign exchange rate.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	3 Months Ended
	Mar. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information The following table provides a reconciliation of cash, cash equivalents and restricted cash and cash equivalents with the Company's interim unaudited condensed consolidated balance sheet that sum to the total of the same such amounts shown in the interim unaudited condensed consolidated statements of cash flows: (Thousands of U.S. Dollars) As at March 31, As at December 31, 2017 2016 2016 2015 Cash and cash equivalents $ 26,716 $ 51,308 $ 25,175 $ 145,342 Restricted cash and cash equivalents - current 7,663 18,474 8,322 92 Restricted cash and cash equivalents - included in other long-term assets 10,319 6,414 9,770 3,317 $ 44,698 $ 76,196 $ 43,267 $ 148,751 Net changes in assets and liabilities from operating activities were as follows: Three Months Ended March 31, (Thousands of U.S. Dollars) 2017 2016 Accounts receivable and other long-term assets $ (2,428 ) $ (2,513 ) Inventory 207 4,339 Prepaids 1,078 466 Accounts payable and accrued and other long-term liabilities 4,310 (5,975 ) Taxes receivable and payable 1,763 3,036 Net changes in assets and liabilities from operating activities $ 4,930 $ (647 ) The following table provides additional supplemental cash flow disclosures: Three Months Ended March 31, (Thousands of U.S. Dollars) 2017 2016 Non-cash investing activities: Net liabilities related to property, plant and equipment, end of period $ 54,875 $ 35,606

Significant Accounting Polici18

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements Simplifying the Measurement of Inventory In July 2015, the FASB issued ASU 2015-11, “Simplifying the Measurement of Inventory". The ASU provides guidance for the subsequent measurement of inventory and requires that inventory that is measured using average cost be measured at the lower of cost and net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. The ASU was effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. The implementation of this update did not materially impact the Company’s consolidated financial position, results of operations or cash flows or disclosure. Employee Share-Based Payment Accounting In March 2016, the FASB issued ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting ". This ASU simplifies several aspects of the accounting for employee share-based payment transactions, including the accounting for forfeitures, income taxes, and statutory tax withholding requirements. The ASU was effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. The Company elected to continue to estimate the total number of awards for which the requisite service period will not be rendered. The implementation of this update did not impact the Company’s consolidated financial position, results of operations or cash flows or disclosure. Income Taxes - Intra-Entity Transfers of Assets Other than Inventory At December 31, 2016, GAAP prohibited the recognition of current and deferred income taxes for intra-entity transfers until an asset leaves the consolidated group, therefore, the current income tax effect of tax reorganizations completed in 2016 was deferred and recognized as prepaid income taxes. At December 31, 2016, the Company's balance sheet included $54.1 million of prepaid income taxes, $12.3 million in current prepaid taxes and $41.8 million in long-term prepaid taxes, and $37.5 million of current income taxes payable relating to tax reorganizations completed in 2016. In October 2016, the FASB issued ASU 2016-16, "Intra-Entity Transfers of Assets Other than Inventory." This ASU requires companies to recognize the income tax effects of intercompany sales or transfers of assets, other than inventory, in the income statement as income tax expense or benefit in the period the sale or transfer occurs. This ASU is effective for fiscal years beginning after December 15, 2017, and interim periods within those years. Early adoption was permitted as of the beginning of an annual reporting period. The ASU is required to be applied on a modified retrospective basis with a cumulative-effect adjustment directly to retained earnings in the period of adoption. The Company early adopted this ASU on January 1, 2017, and in the three months ending March 31, 2017, wrote off the income tax effects that had been deferred from past intercompany transactions to opening deficit. Prepaid tax of $54.1 million and deferred tax assets of $178.6 million were recorded directly to opening deficit at January 1, 2017. Deferred tax assets recorded upon adoption were assessed for realizability under ASC 740, and, valuation allowances were recognized on those deferred tax assets as necessary on the date of adoption. The adoption of ASU 2016-16 did not have any effect on the Company’s cash flows. Restricted Cash and Cash Equivalents In November 2016, the FASB issued ASU 2016-18, "Restricted Cash". ASU 2016-18 requires that a statement of cash flows explain the change during the period in the total cash, cash equivalents and amounts generally described as restricted cash or restricted cash equivalents. ASU 2016-18 is effective for annual reporting periods and interim reporting periods within those annual reporting periods, beginning after December 15, 2017. The ASU was adopted on a retrospective basis to each period presented. The implementation of this ASU did not impact the Company's consolidated financial position or results of operations, and did not have a material impact on net cash used in investing activities for the three months ended March 31, 2017 , or 2016. Clarifying the Definition of a Business In January 2017, the FASB issued ASU 2017-01, "Clarifying the Definition of a Business". ASU 2017-01 narrows the definition of a business and provides a framework that gives entities a basis for making reasonable judgments about whether a transaction involves an asset or a business. ASU 2017-01 is effective for annual reporting periods and interim reporting periods within those annual reporting periods, beginning after December 15, 2017. Early adoption was permitted and the Company adopted this ASU on January 1, 2017. The Company now applies an initial screen for determining whether a transaction involves an asset or a business. When substantially all of the fair value of the gross assets acquired is concentrated in a single identified asset, or group of similar identifiable assets, the set will not be a business and no goodwill or gain on acquisition will be recognized. If the screen is not met, a set cannot be considered a business unless it includes an input and a substantive process that together significantly contribute to the ability to create an output. Simplifying the Test for Goodwill Impairment In January 2017, the FASB issued ASU 2017-04, "Simplifying the Test for Goodwill Impairment". ASU 2017-04 eliminates step 2 of the goodwill impairment test. An entity no longer will determine goodwill impairment by calculating the implied fair value of goodwill by assigning the fair value of a reporting unit to all of its assets and liabilities as if that reporting unit had been acquired in a business combination. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. ASU 2017-04 is effective for annual reporting periods and interim reporting periods within those annual reporting periods, beginning after December 15, 2019. Early adoption is permitted. At December 31, 2016, the Company performed a qualitative assessment of goodwill and, based on this assessment, no impairment of goodwill was identified. The Company did not have to perform step 2 of the goodwill impairment test.

Segment and Geographic Report19

Segment and Geographic Reporting (Tables)	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Schedule of Information on Reportable Segments and Other Activities	The following tables present information on the Company’s reportable segments and other activities: Three Months Ended March 31, 2017 (Thousands of U.S. Dollars) Colombia Peru Brazil All Other Total Oil and natural gas sales $ 90,464 $ — $ 4,195 $ — $ 94,659 Depletion, depreciation and accretion 24,935 226 1,213 219 26,593 Asset impairment — 283 — — 283 General and administrative expenses 4,832 355 305 3,220 8,712 Income (loss) before income taxes 37,144 (513 ) 1,520 (6,584 ) 31,567 Segment capital expenditures 42,840 1,207 1,749 364 46,160 Three Months Ended March 31, 2016 (Thousands of U.S. Dollars) Colombia Peru Brazil All Other Total Oil and natural gas sales $ 56,300 $ — $ 1,103 $ — $ 57,403 Depletion, depreciation and accretion 35,736 141 718 317 36,912 Asset impairment 55,232 416 1,250 — 56,898 General and administrative expenses 3,265 409 292 3,083 7,049 (Loss) income before income taxes (72,721 ) (712 ) (1,509 ) 4,797 (70,145 ) Segment capital expenditures 21,986 1,268 2,720 206 26,180
Schedule of Long-lived Assets by Geographical Area	As at March 31, 2017 (Thousands of U.S. Dollars) Colombia Peru Brazil All Other Total Property, plant and equipment $ 958,977 $ 69,325 $ 55,810 $ 3,184 $ 1,087,296 Goodwill 102,581 — — — 102,581 All other assets 211,693 11,111 3,559 16,053 242,416 Total Assets $ 1,273,251 $ 80,436 $ 59,369 $ 19,237 $ 1,432,293 As at December 31, 2016 (Thousands of U.S. Dollars) Colombia Peru Brazil All Other Total Property, plant and equipment $ 939,947 $ 68,428 $ 55,196 $ 3,038 $ 1,066,609 Goodwill 102,581 — — — 102,581 All other assets 177,393 10,848 1,619 8,846 198,706 Total Assets $ 1,219,921 $ 79,276 $ 56,815 $ 11,884 $ 1,367,896

Property, Plant and Equipment20

Property, Plant and Equipment and Inventory (Tables)	3 Months Ended
	Mar. 31, 2017
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	Property, Plant and Equipment (Thousands of U.S. Dollars) As at March 31, 2017 As at December 31, 2016 Oil and natural gas properties Proved $ 2,725,784 $ 2,652,171 Unproved 620,045 647,774 3,345,829 3,299,945 Other 29,744 29,445 3,375,573 3,329,390 Accumulated depletion, depreciation and impairment (2,288,277 ) (2,262,781 ) $ 1,087,296 $ 1,066,609
Schedule of Asset Impairment	Asset impairment for the three months ended March 31, 2017 , and 2016 was as follows: Three Months Ended March 31, (Thousands of U.S. Dollars) 2017 2016 Impairment of oil and gas properties $ 283 $ 56,234 Impairment of inventory — 664 $ 283 $ 56,898

Debt and Debt Issuance Costs (T

Debt and Debt Issuance Costs (Tables)	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Schedule of Debt	The Company's debt at March 31, 2017 , and December 31, 2016 , was as follows: (Thousands of U.S. Dollars) As at March 31, 2017 As at December 31, 2016 Convertible senior notes $ 115,000 $ 115,000 Revolving credit facility 85,000 90,000 Unamortized debt issuance costs (6,841 ) (7,917 ) Long-term debt $ 193,159 $ 197,083
Schedule of Interest Expense Recognized	The following table presents total interest expense recognized in the accompanying interim unaudited condensed consolidated statements of operations: Three Months Ended March 31, (Thousands of U.S. Dollars) 2017 2016 Contractual interest and other financing expenses $ 2,490 $ 379 Amortization of debt issuance costs 605 140 $ 3,095 $ 519

Share Capital (Tables)

Share Capital (Tables)	3 Months Ended
	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Common Stock	Shares of Common Stock Exchangeable Shares of Gran Tierra Exchangeco Inc. Exchangeable Shares of Gran Tierra Goldstrike Inc. Balance, December 31, 2016 390,807,194 4,812,592 3,387,302 Exchange of exchangeable shares 8,000 (8,000 ) — Shares canceled (4 ) — — Balance, March 31, 2017 390,815,190 4,804,592 3,387,302
Schedule of PSU, DSU, RSU and Stock Option Activity	The following table provides information about p erformance stock units (“PSUs”), deferred share units (“DSUs”), restricted stock units (“RSUs”) and stock option activity for the three months ended March 31, 2017 : PSUs DSUs RSUs Stock Options Number of Outstanding Share Units Number of Outstanding Share Units Number of Outstanding Share Units Number of Outstanding Stock Options Weighted Average Exercise Price/Stock Option ($) Balance, December 31, 2016 3,362,717 208,698 359,145 9,239,478 4.16 Granted 3,098,100 48,337 — 1,819,380 2.57 Exercised — — (123,326 ) — — Forfeited — — (2,558 ) (21,595 ) (5.71 ) Balance, March 31, 2017 6,460,817 257,035 233,261 11,037,263 3.90
Weighted Average Shares Outstanding	Weighted Average Shares Outstanding Three Months Ended March 31, 2017 2016 Weighted average number of common and exchangeable shares outstanding 399,007,086 293,812,226 Shares issuable pursuant to stock options 635,484 — Shares assumed to be purchased from proceeds of stock options (596,456 ) — Weighted average number of diluted common and exchangeable shares outstanding 399,046,114 293,812,226

Asset Retirement Obligation (Ta

Asset Retirement Obligation (Tables)	3 Months Ended
	Mar. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]
Schedule of Changes in the Carrying Amounts of the Asset Retirement Obligation	Changes in the carrying amounts of the asset retirement obligation associated with the Company’s oil and natural gas properties were as follows: Three Months Ended Year Ended (Thousands of U.S. Dollars) March 31, 2017 December 31, 2016 Balance, beginning of period $ 43,357 $ 33,224 Settlements (195 ) (872 ) Liabilities associated with assets sold — (3,257 ) Liability incurred 190 2,606 Liabilities assumed in acquisition — 15,723 Accretion 822 2,789 Revisions in estimated liability — (6,856 ) Balance, end of period $ 44,174 $ 43,357 Asset retirement obligation - current $ 1,214 $ 5,215 Asset retirement obligation - long-term 42,960 38,142 $ 44,174 $ 43,357

Financial Instruments and Fai24

Financial Instruments and Fair Value Measurement (Tables)	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Derivatives, and RSU and PSU Liabilities	The fair value of derivatives, and RSU and PSU liabilities at March 31, 2017 , and December 31, 2016 , were as follows: (Thousands of U.S. Dollars) As at March 31, 2017 As at December 31, 2016 Commodity price derivative asset $ 879 $ — Foreign currency derivative asset 546 578 $ 1,425 $ 578 Commodity price derivative liability $ — $ 3,824 RSU, PSU and DSU liability 4,197 3,907 $ 4,197 $ 7,731
Schedule of Gains or Losses on Financial Instruments Recognized	The following table presents gains or losses on financial instruments recognized in the accompanying interim unaudited condensed consolidated statements of operations: Three Months Ended March 31, (Thousands of U.S. Dollars) 2017 2016 Commodity price derivative gain $ (4,703 ) $ — Foreign currency derivatives gain (736 ) — Trading securities loss — 845 Financial instruments (gain) loss $ (5,439 ) $ 845
Schedule of Outstanding Commodity Price Derivative Positions	At March 31, 2017 , the Company had outstanding commodity price derivative positions as follows: Period and type of instrument Volume, Reference Sold Put ($/bbl) Purchased Put Sold Call ($/bbl) Collar: June 1, 2016 to May 31, 2017 10,000 ICE Brent $ 35 $ 45 $ 65 Collar: October 1, 2016 to December 31, 2017 5,000 ICE Brent $ 35 $ 45 $ 65 Collar: June 1, 2017 to December 31, 2017 10,000 ICE Brent $ 35 $ 45 $ 65
Schedule of Outstanding Foreign Currency Derivative Positions	At March 31, 2017 , the Company had outstanding foreign currency derivative positions as follows: Period and type of instrument Amount Hedged U.S. Dollar Equivalent of Amount Hedged (1) (Thousands of U.S. Dollars) Reference Purchased Call Sold Put Collar: April 1, 2017 to May 31, 2017 22,697 7,881 COP 3,100 3,340 (1) At March 31, 2017 foreign exchange rate.

Supplemental Cash Flow Inform25

Supplemental Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Reconciliation of Cash, Cash Equivalents, and Restricted Cash	The following table provides a reconciliation of cash, cash equivalents and restricted cash and cash equivalents with the Company's interim unaudited condensed consolidated balance sheet that sum to the total of the same such amounts shown in the interim unaudited condensed consolidated statements of cash flows: (Thousands of U.S. Dollars) As at March 31, As at December 31, 2017 2016 2016 2015 Cash and cash equivalents $ 26,716 $ 51,308 $ 25,175 $ 145,342 Restricted cash and cash equivalents - current 7,663 18,474 8,322 92 Restricted cash and cash equivalents - included in other long-term assets 10,319 6,414 9,770 3,317 $ 44,698 $ 76,196 $ 43,267 $ 148,751
Schedule of Net Changes in Assets and Liabilities	Net changes in assets and liabilities from operating activities were as follows: Three Months Ended March 31, (Thousands of U.S. Dollars) 2017 2016 Accounts receivable and other long-term assets $ (2,428 ) $ (2,513 ) Inventory 207 4,339 Prepaids 1,078 466 Accounts payable and accrued and other long-term liabilities 4,310 (5,975 ) Taxes receivable and payable 1,763 3,036 Net changes in assets and liabilities from operating activities $ 4,930 $ (647 )
Schedule of Additional Supplemental Cash Flow Disclosures	The following table provides additional supplemental cash flow disclosures: Three Months Ended March 31, (Thousands of U.S. Dollars) 2017 2016 Non-cash investing activities: Net liabilities related to property, plant and equipment, end of period $ 54,875 $ 35,606

Description of Business (Detail

Description of Business (Details) - Brazil Divestiture - Held-for-sale - USD ($) $ in Millions	Feb. 07, 2017	Feb. 06, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration to be received on completion of divestiture		$ 35
Deposit paid by the Purchaser	$ 3.5
Tie Field
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Working interest (as a percent)		100.00%

Significant Accounting Polici27

Significant Accounting Policies (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Jan. 01, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prepaid income taxes			$ 54,100
Current prepaid taxes	$ 0		12,271
Long-term prepaid taxes	$ 0		41,784
Current income taxes payable			37,500
Retained earnings | New Accounting Pronouncement, Early Adoption, Effect | ASU 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Prepaid income taxes			$ 54,100
Deferred tax assets		$ 178,600

Segment and Geographic Report28

Segment and Geographic Reporting - Schedule of Information on Reportable Segments and Other Activities (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Oil and natural gas sales	$ 94,659,000	$ 57,403,000
Depletion, depreciation and accretion	26,593,000	36,912,000
Asset impairment	283,000	56,898,000
General and administrative expenses	8,712,000	7,049,000
Income (loss) before income taxes	31,567,000	(70,145,000)
Segment capital expenditures	46,160,000	26,180,000
Colombia
Segment Reporting Information [Line Items]
Asset impairment	0	54,600,000
Peru
Segment Reporting Information [Line Items]
Asset impairment	300,000	400,000
Brazil
Segment Reporting Information [Line Items]
Asset impairment	0	1,300,000
Reportable Segments | Colombia
Segment Reporting Information [Line Items]
Oil and natural gas sales	90,464,000	56,300,000
Depletion, depreciation and accretion	24,935,000	35,736,000
Asset impairment	0	55,232,000
General and administrative expenses	4,832,000	3,265,000
Income (loss) before income taxes	37,144,000	(72,721,000)
Segment capital expenditures	42,840,000	21,986,000
Reportable Segments | Peru
Segment Reporting Information [Line Items]
Oil and natural gas sales	0	0
Depletion, depreciation and accretion	226,000	141,000
Asset impairment	283,000	416,000
General and administrative expenses	355,000	409,000
Income (loss) before income taxes	(513,000)	(712,000)
Segment capital expenditures	1,207,000	1,268,000
Reportable Segments | Brazil
Segment Reporting Information [Line Items]
Oil and natural gas sales	4,195,000	1,103,000
Depletion, depreciation and accretion	1,213,000	718,000
Asset impairment	0	1,250,000
General and administrative expenses	305,000	292,000
Income (loss) before income taxes	1,520,000	(1,509,000)
Segment capital expenditures	1,749,000	2,720,000
All Other
Segment Reporting Information [Line Items]
Oil and natural gas sales	0	0
Depletion, depreciation and accretion	219,000	317,000
Asset impairment	0	0
General and administrative expenses	3,220,000	3,083,000
Income (loss) before income taxes	(6,584,000)	4,797,000
Segment capital expenditures	$ 364,000	$ 206,000

Segment and Geographic Report29

Segment and Geographic Reporting - Schedule of Long-lived Assets by Geographical Area (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Property, plant and equipment	$ 1,087,296	$ 1,066,609
Goodwill	102,581	102,581
All other assets	242,416	198,706
Total Assets	1,432,293	1,367,896
Reportable Segments | Colombia
Segment Reporting Information [Line Items]
Property, plant and equipment	958,977	939,947
Goodwill	102,581	102,581
All other assets	211,693	177,393
Total Assets	1,273,251	1,219,921
Reportable Segments | Peru
Segment Reporting Information [Line Items]
Property, plant and equipment	69,325	68,428
Goodwill	0	0
All other assets	11,111	10,848
Total Assets	80,436	79,276
Reportable Segments | Brazil
Segment Reporting Information [Line Items]
Property, plant and equipment	55,810	55,196
Goodwill	0	0
All other assets	3,559	1,619
Total Assets	59,369	56,815
All Other
Segment Reporting Information [Line Items]
Property, plant and equipment	3,184	3,038
Goodwill	0	0
All other assets	16,053	8,846
Total Assets	$ 19,237	$ 11,884

Property, Plant and Equipment30

Property, Plant and Equipment and Inventory - Schedule of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Oil and natural gas properties	$ 3,375,573	$ 3,329,390
Accumulated depletion, depreciation and impairment	(2,288,277)	(2,262,781)
Total Property, Plant and Equipment (Notes 3 and 4)	1,087,296	1,066,609
Oil and natural gas properties
Property, Plant and Equipment [Line Items]
Oil and natural gas properties	3,345,829	3,299,945
Proved
Property, Plant and Equipment [Line Items]
Oil and natural gas properties	2,725,784	2,652,171
Unproved
Property, Plant and Equipment [Line Items]
Oil and natural gas properties	620,045	647,774
Other
Property, Plant and Equipment [Line Items]
Oil and natural gas properties	$ 29,744	$ 29,445

Property, Plant and Equipment31

Property, Plant and Equipment and Inventory - Schedule of Asset Impairment (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Property, Plant and Equipment [Abstract]
Impairment of oil and gas properties	$ 283,000	$ 56,234,000
Impairment of inventory	0	664,000
Total asset impairment	$ 283,000	$ 56,898,000

Property, Plant and Equipment32

Property, Plant and Equipment and Inventory - Narrative (Details) bbl in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017USD ($)$ / bblbbl	Mar. 31, 2016USD ($)$ / bbl	Dec. 31, 2016USD ($)$ / bblbbl	Dec. 31, 2015$ / bbl
Property, Plant and Equipment [Line Items]
Impairment losses	$ 283,000	$ 56,898,000
Oil inventories	5,500,000		$ 6,000,000
Supplies inventories	$ 1,800,000		$ 1,800,000
Oil inventory (in barrels) | bbl	185		208
Oil inventory impairment	$ 0	$ 664,000
Crude Oil and NGL
Property, Plant and Equipment [Line Items]
Average Brent price per bbl (in dollars per barrel) | $ / bbl	49.33	48.79	42.92	54.08
Oil and natural gas properties | Assets | Cost Approach Valuation Technique
Property, Plant and Equipment [Line Items]
Discount rate	10.00%
Peru
Property, Plant and Equipment [Line Items]
Impairment losses	$ 300,000	$ 400,000
Colombia
Property, Plant and Equipment [Line Items]
Impairment losses	0	54,600,000
Brazil
Property, Plant and Equipment [Line Items]
Impairment losses	$ 0	$ 1,300,000

Debt and Debt Issuance Costs -

Debt and Debt Issuance Costs - Schedule of Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Unamortized debt issuance costs	$ (6,841)	$ (7,917)
Long-term debt	193,159	197,083
Convertible senior notes
Debt Instrument [Line Items]
Convertible senior notes and revolving credit facility	115,000	115,000
Revolving credit facility | Revolving credit facility
Debt Instrument [Line Items]
Convertible senior notes and revolving credit facility	$ 85,000	$ 90,000

Debt and Debt Issuance Costs 34

Debt and Debt Issuance Costs - Schedule of Interest Expense Recognized (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 605	$ 140
Total interest expense recognized	3,095	519
Convertible debt
Debt Instrument [Line Items]
Contractual interest and other financing expenses	2,490	379
Amortization of debt issuance costs	605	140
Total interest expense recognized	$ 3,095	$ 519

Share Capital - Additional Info

Share Capital - Additional Information (Narrative) (Details) - $ / shares	Mar. 31, 2017	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Authorized share capital (in shares)	595,000,002
Common stock shares authorized	570,000,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock shares authorized	25,000,000
Preferred stock, par value (in dollars per share)	$ 0.001
Special A Voting Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock shares authorized	1
Preferred stock, par value (in dollars per share)	$ 0.001
Special B Voting Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock shares authorized	1
Preferred stock, par value (in dollars per share)	$ 0.001

Share Capital - Schedule of Com

Share Capital - Schedule of Common Stock (Details)	3 Months Ended
	Mar. 31, 2017shares
Increase (Decrease) in Common Stock
Beginning balance (in shares)	390,807,194
Ending balance (in shares)	390,815,190
Common Stock
Increase (Decrease) in Common Stock
Beginning balance (in shares)	390,807,194
Exchange of exchangeable shares (in shares)	8,000
Shares canceled (in shares)	(4)
Ending balance (in shares)	390,815,190
Common Stock | Exchangeable Shares of Gran Tierra Exchangeco Inc.
Increase (Decrease) in Common Stock
Beginning balance (in shares)	4,812,592
Exchange of exchangeable shares (in shares)	(8,000)
Shares canceled (in shares)	0
Ending balance (in shares)	4,804,592
Common Stock | Exchangeable Shares of Gran Tierra Goldstrike Inc.
Increase (Decrease) in Common Stock
Beginning balance (in shares)	3,387,302
Exchange of exchangeable shares (in shares)	0
Shares canceled (in shares)	0
Ending balance (in shares)	3,387,302

Share Capital - Schedule of PSU

Share Capital - Schedule of PSU, DSU, RSU and Stock Option Activity (Details)	3 Months Ended
	Mar. 31, 2017$ / sharesshares
Number of Outstanding Stock Options
Beginning Balance (in shares)	9,239,478
Granted (in shares)	1,819,380
Exercised (in shares)	0
Forfeited (in shares)	(21,595)
Ending Balance (in shares)	11,037,263
Weighted Average Exercise Price/Stock Option ($)
Beginning balance (in dollars per share) | $ / shares	$ 4.16
Granted (in dollars per share) | $ / shares	2.57
Exercised (in dollars per share) | $ / shares	0
Forfeited (in dollars per share) | $ / shares	(5.71)
Ending balance (in dollars per share) | $ / shares	$ 3.90
PSUs
Number of Outstanding Share Units
Beginning Balance (in shares)	3,362,717
Granted (in shares)	3,098,100
Exercised (in shares)	0
Forfeited (in shares)	0
Ending Balance (in shares)	6,460,817
DSUs
Number of Outstanding Share Units
Beginning Balance (in shares)	208,698
Granted (in shares)	48,337
Exercised (in shares)	0
Forfeited (in shares)	0
Ending Balance (in shares)	257,035
RSUs
Number of Outstanding Share Units
Beginning Balance (in shares)	359,145
Granted (in shares)	0
Exercised (in shares)	(123,326)
Forfeited (in shares)	(2,558)
Ending Balance (in shares)	233,261

Share Capital - Equity Compensa

Share Capital - Equity Compensation Awards (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 16.7		$ 10
Weighted average period for recognition	2 years 2 months 3 days
General and administrative (G&A) expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1.2	$ 1.5

Share Capital - Weighted Averag

Share Capital - Weighted Average Shares Outstanding (Details) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Weighted average number of common and exchangeable shares outstanding	399,007,086	293,812,226
Shares issuable pursuant to stock options	635,484	0
Shares assumed to be purchased from proceeds of stock options	(596,456)	0
Weighted average number of diluted common and exchangeable shares outstanding	399,046,114	293,812,226

Share Capital - Weighted Aver40

Share Capital - Weighted Average Shares Outstanding (Narrative) (Details) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options excluded from diluted income (loss) per share calculation (in shares)	9,210,869	12,667,761

Asset Retirement Obligation - S

Asset Retirement Obligation - Schedule of Changes in the Carrying Amounts of the Asset Retirement Obligation (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2017	Dec. 31, 2016
Asset Retirement Obligation, Roll Forward Analysis
Balance, beginning of period	$ 43,357	$ 33,224
Settlements	(195)	(872)
Liabilities associated with assets sold	0	(3,257)
Liability incurred	190	2,606
Liabilities assumed in acquisition	0	15,723
Accretion	822	2,789
Revisions in estimated liability	0	(6,856)
Balance, end of period	44,174	43,357
Asset retirement obligation - current			$ 1,214	$ 5,215
Asset retirement obligation - long-term			42,960	38,142
Asset retirement obligation	$ 43,357	$ 33,224	$ 44,174	$ 43,357

Asset Retirement Obligation - N

Asset Retirement Obligation - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]
Cash payments included in settlements	$ 13	$ 104
Fair value of assets that are legally restricted	$ 12,600		$ 12,000

Taxes (Details)

Taxes (Details)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Effective tax rate	60.00%	36.00%
U.S. statutory rate	35.00%	35.00%

Contingencies (Details)

Contingencies (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Letters of credit and other credit support provided as security relating to work commitment guarantees	$ 88,300,000	$ 96,800,000
Pending Litigation Royalty, Transportation and Related Costs
Loss Contingencies [Line Items]
Estimated compensation which would be payable if the ANH's interpretation is correct	46,400,000
Amount accrued	$ 0

Financial Instruments and Fai45

Financial Instruments and Fair Value Measurement - Schedule of Fair Value of Derivatives, and RSU and PSU Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative asset	$ 1,425	$ 578
Assets, fair value disclosure	1,425	578
Commodity price derivative liability	0	3,824
RSU, PSU and DSU liability	4,197	3,907
Liabilities, fair value disclosure	4,197	7,731
Commodity price derivative asset
Derivatives, Fair Value [Line Items]
Derivative asset	879	0
Foreign currency derivative asset
Derivatives, Fair Value [Line Items]
Derivative asset	$ 546	$ 578

Financial Instruments and Fai46

Financial Instruments and Fair Value Measurement - Schedule of Gains or Losses on Financial Instruments Recognized (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Trading securities loss	$ 0	$ 845
Financial instruments (gain) loss	(5,439)	845
Commodity price derivative gain
Derivative Instruments, Gain (Loss) [Line Items]
Derivative (gain) loss	(4,703)	0
Foreign currency derivatives gain
Derivative Instruments, Gain (Loss) [Line Items]
Derivative (gain) loss	$ (736)	$ 0

Financial Instruments and Fai47

Financial Instruments and Fair Value Measurement - Narrative (Details) $ in Millions	Mar. 31, 2017USD ($)
Carrying amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Value of the Notes	$ 110.1
Fair value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Value of the Notes	$ 128.5

Financial Instruments and Fai48

Financial Instruments and Fair Value Measurement - Schedule of Outstanding Commodity Price Derivative Positions (Details) bbl in Thousands	3 Months Ended
	Mar. 31, 2017$ / bblbbl
Collar: June 1, 2016 to May 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (in barrels of oil per day) | bbl	10
Collar: June 1, 2016 to May 31, 2017 | Sold | Put
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Floor price (in dollars per barrel)	35
Collar: June 1, 2016 to May 31, 2017 | Sold | Call
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cap price (in dollars per barrel)	65
Collar: June 1, 2016 to May 31, 2017 | Purchased
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Floor price (in dollars per barrel)	45
Collar: October 1, 2016 to December 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (in barrels of oil per day) | bbl	5
Collar: October 1, 2016 to December 31, 2017 | Sold | Put
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Floor price (in dollars per barrel)	35
Collar: October 1, 2016 to December 31, 2017 | Sold | Call
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cap price (in dollars per barrel)	65
Collar: October 1, 2016 to December 31, 2017 | Purchased
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Floor price (in dollars per barrel)	45
Collar: June 1, 2017 to December 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Volume (in barrels of oil per day) | bbl	10
Collar: June 1, 2017 to December 31, 2017 | Sold | Put
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Floor price (in dollars per barrel)	35
Collar: June 1, 2017 to December 31, 2017 | Sold | Call
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cap price (in dollars per barrel)	65
Collar: June 1, 2017 to December 31, 2017 | Purchased
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Floor price (in dollars per barrel)	45

Financial Instruments and Fai49

Financial Instruments and Fair Value Measurement - Schedule of Outstanding Foreign Currency Derivative Positions (Details) - Collar: April 1, 2017 to May 31, 2017 $ in Thousands, COP in Millions	Mar. 31, 2017COPCOP / collar	Mar. 31, 2017USD ($)COP / collar
Purchased
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cap price (in Colombian pesos)	3,100,000	3,100,000
Sold | Put
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Floor price (in Colombian pesos)	3,340,000	3,340,000
COP
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount Hedged (in Colombian pesos and U.S. dollars) | COP	COP 22,697
U.S. Dollars
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount Hedged (in Colombian pesos and U.S. dollars) | $		$ 7,881

Supplemental Cash Flow Inform50

Supplemental Cash Flow Information - Reconciliation of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 26,716	$ 25,175	$ 51,308	$ 145,342
Restricted cash and cash equivalents - current	7,663	8,322	18,474	92
Restricted cash and cash equivalents - included in other long-term assets	10,319	9,770	6,414	3,317
Cash, cash equivalents and restricted cash and cash equivalents	$ 44,698	$ 43,267	$ 76,196	$ 148,751

Supplemental Cash Flow Inform51

Supplemental Cash Flow Information - Schedule of Net Changes in Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Accounts receivable and other long-term assets	$ (2,428)	$ (2,513)
Inventory	207	4,339
Prepaids	1,078	466
Accounts payable and accrued and other long-term liabilities	4,310	(5,975)
Taxes receivable and payable	1,763	3,036
Net changes in assets and liabilities from operating activities	$ 4,930	$ (647)

Supplemental Cash Flow Inform52

Supplemental Cash Flow Information - Schedule of Additional Supplemental Cash Flow Disclosures (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Net liabilities related to property, plant and equipment, end of period	$ 54,875	$ 35,606