ProPetro Holding (PUMP) 10-K 27 Mar 18 2017 FY Annual report Financial data

DOCUMENT AND ENTITY INFORMATION

DOCUMENT AND ENTITY INFORMATION - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Mar. 16, 2018	Jun. 30, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	ProPetro Holding Corp.
Entity Central Index Key	1,680,247
Document Type	10-K
Amendment Flag	false
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Document Period End Date	Dec. 31, 2017
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2,017
Entity Common Stock, Shares Outstanding		83,039,854
Entity Voluntary Filers	No
Entity Public Float			$ 674.2

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 23,949	$ 133,596
Accounts receivable - net of allowance for doubtful accounts of $443 and $552, respectively	199,656	115,179
Inventories	6,184	4,713
Prepaid expenses	5,123	4,608
Other current assets	748	6,684
Total current assets	235,660	264,780
PROPERTY AND EQUIPMENT - Net of accumulated depreciation	470,910	263,862
OTHER NONCURRENT ASSETS:
Goodwill	9,425	9,425
Intangible assets - net of amortization	301	589
Deferred revenue rebate - net of amortization	615	2,462
Other noncurrent assets	2,121	304
Total other noncurrent assets	12,462	12,780
TOTAL ASSETS	719,032	541,422
CURRENT LIABILITIES:
Accounts payable	211,149	129,093
Accrued liabilities	16,607	13,619
Current portion of long-term debt	15,764	16,920
Accrued interest payable	76	109
Total current liabilities	243,596	159,741
DEFERRED INCOME TAXES	4,881	1,148
LONG-TERM DEBT	57,178	159,407
OTHER LONG-TERM LIABILITIES	125	117
Total liabilities	305,780	320,413
COMMITMENTS AND CONTINGENCIES (Note 17)
SHAREHOLDERS’ EQUITY:
Preferred stock, $0.001 par value, 30,000,000 shares authorized, 0 and 16,999,990 shares issued, respectively	0	17
Preferred stock, additional paid-in capital	0	162,494
Common stock, $0.001 par value, 200,000,000 shares authorized, 83,039,854 and 52,627,652 shares issued, respectively	83	53
Additional paid-in capital	607,466	265,355
Accumulated deficit	(194,297)	(206,910)
Total shareholders’ equity	413,252	221,009
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 719,032	$ 541,422

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 443	$ 552
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, authorized (in shares)	30,000,000	30,000,000
Preferred stock, issued (in shares)	0	16,999,990
Preferred stock, outstanding (in shares)	0	16,999,990
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized (in shares)	200,000,000	200,000,000
Common stock, issued (in shares)	83,039,854	52,627,652
Common stock, outstanding (in shares)	83,039,854	52,627,652

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
REVENUE - Service revenue	$ 981,865,000	$ 436,920,000	$ 569,618,000
COSTS AND EXPENSES:
Cost of services (exclusive of depreciation and amortization)	813,823,000	404,140,000	483,338,000
General and administrative (inclusive of stock‑based compensation)	49,215,000	26,613,000	27,370,000
Depreciation and amortization	55,628,000	43,542,000	50,134,000
Property and equipment impairment expense	0	6,305,000	36,609,000
Goodwill impairment expense	0	1,177,000	0
Loss on disposal of assets	39,086,000	22,529,000	21,268,000
Total costs and expenses	957,752,000	504,306,000	618,719,000
OPERATING INCOME (LOSS)	24,113,000	(67,386,000)	(49,101,000)
OTHER INCOME (EXPENSE):
Interest expense	(7,347,000)	(20,387,000)	(21,641,000)
Gain on extinguishment of debt	0	6,975,000	0
Other expense	(1,025,000)	(321,000)	(499,000)
Total other income (expense)	(8,372,000)	(13,733,000)	(22,140,000)
INCOME (LOSS) BEFORE INCOME TAXES	15,741,000	(81,119,000)	(71,241,000)
INCOME TAX (EXPENSE)/BENEFIT	(3,128,000)	27,972,000	25,388,000
NET INCOME (LOSS)	$ 12,613,000	$ (53,147,000)	$ (45,853,000)
NET INCOME (LOSS) PER COMMON SHARE:
Basic (in dollars per share)	$ 0.17	$ (1.19)	$ (1.31)
Diluted (in dollars per share)	$ 0.16	$ (1.19)	$ (1.31)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	76,371	44,787	34,993
Diluted (in shares)	79,583	44,787	34,993

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Preferred Additional Paid‑In Capital	Common Stock	Additional Paid‑In Capital	Accumulated Deficit	Common Stock	Common StockCommon Stock	Common StockAdditional Paid‑In Capital	Preferred Stock	Preferred StockPreferred Stock	Preferred StockPreferred Additional Paid‑In Capital
BALANCE at Dec. 31, 2014	$ 114,185	$ 0	$ 0	$ 35	$ 222,060	$ (107,910)
Balance (in shares) at Dec. 31, 2014		0		34,621,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock‑based compensation cost	1,239				1,239
Net income (loss)	(45,853)					(45,853)
BALANCE at Dec. 31, 2015	69,571	$ 0	0	$ 35	223,299	(153,763)
Balance (in shares) at Dec. 31, 2015		0		34,621,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock‑based compensation cost	1,649				1,649
Stock issued, net of costs							$ 40,425	$ 18	$ 40,407	$ 162,511	$ 17	$ 162,494
Stock issued (in shares)								18,007,000			17,000,000
Net income (loss)	(53,147)					(53,147)
BALANCE at Dec. 31, 2016	221,009	$ 17	162,494	$ 53	265,355	(206,910)
Balance (in shares) at Dec. 31, 2016		17,000,000		52,628,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock‑based compensation cost	9,489				9,489
Stock issued, net of costs	170,141			$ 13	170,128
Stock issued (in shares)				13,250,000
Conversion of preferred stock to common stock at Initial Public Offering	0	$ (17)	(162,494)	$ 17	162,494
Conversion of preferred stock to common stock at Initial Public Offering (in shares)		(17,000,000)		17,000,000
Exercise of stock options—net	$ 0			$ 0	0
Exercise of stock options—net (in shares)	226,194			162,000
Net income (loss)	$ 12,613					12,613
BALANCE at Dec. 31, 2017	$ 413,252	$ 0	$ 0	$ 83	$ 607,466	$ (194,297)
Balance (in shares) at Dec. 31, 2017		0		83,040,000

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 12,613,000	$ (53,147,000)	$ (45,853,000)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	55,628,000	43,542,000	50,134,000
Gain on extinguishment of debt	0	(6,975,000)	0
Property and equipment impairment expense	0	6,305,000	36,609,000
Goodwill impairment expense	0	1,177,000	0
Deferred income tax expense (benefit)	3,430,000	(27,972,000)	(23,945,000)
Amortization of deferred revenue rebate	1,846,000	1,846,000	1,846,000
Amortization of deferred debt issuance costs	3,403,000	2,091,000	1,351,000
Stock-based compensation	9,489,000	1,649,000	1,239,000
Loss on disposal of assets	39,086,000	22,529,000	21,268,000
(Gain) loss on interest rate swap	(251,000)	(205,000)	260,000
Changes in operating assets and liabilities:
Accounts receivable	(84,477,000)	(24,888,000)	67,348,000
Other current assets	3,304,000	(563,000)	9,000
Inventories	(1,472,000)	3,859,000	(622,000)
Prepaid expenses	(468,000)	(62,000)	2,082,000
Accounts payable	64,228,000	37,049,000	(23,889,000)
Accrued liabilities	2,930,000	4,392,000	(6,295,000)
Accrued interest	(32,000)	32,000	(312,000)
Net cash provided by operating activities	109,257,000	10,659,000	81,230,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures	(285,891,000)	(42,832,000)	(62,855,000)
Proceeds from sale of assets	4,422,000	1,144,000	79,000
Net cash used in investing activities	(281,469,000)	(41,688,000)	(62,776,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings	60,045,000	0	60,718,000
Repayments of borrowings	(166,546,000)	(41,295,000)	(73,782,000)
Proceeds from insurance financing	4,125,000	4,126,000	4,105,000
Repayments of insurance financing	(3,807,000)	(4,527,000)	(6,257,000)
Extinguishment of debt	0	(30,000,000)	0
Payment of debt extinguishment costs	0	(525,000)	0
Payment of debt issuance costs	(1,653,000)	(140,000)	0
Proceeds from additional common equity capitalization	0	40,425,000	0
Proceeds from preferred equity capitalization	0	170,000,000	0
Payment of preferred equity capitalization costs	0	(7,489,000)	0
Proceeds from IPO	185,500,000	0	0
Payment of deferred IPO costs	(15,099,000)	(260,000)	0
Net cash provided by (used in) financing activities	62,565,000	130,315,000	(15,216,000)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(109,647,000)	99,286,000	3,238,000
CASH AND CASH EQUIVALENTS — Beginning of year	133,596,000	34,310,000	31,072,000
CASH AND CASH EQUIVALENTS — End of year	$ 23,949,000	$ 133,596,000	$ 34,310,000

ORGANIZATION AND HISTORY

ORGANIZATION AND HISTORY	12 Months Ended
	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
ORGANIZATION AND HISTORY	ORGANIZATION AND HISTORY ProPetro Holding Corp. (“Holding”), a Texas corporation was formed on April 14, 2007, to serve as a holding company for its wholly owned subsidiary ProPetro Services, Inc. (“Services”), a Texas corporation. Services provide hydraulic fracturing (inclusive of acidizing), cementing, coil tubing, drilling, surface drilling and flowback services to oil and gas producers, located primarily in Texas, Oklahoma, New Mexico, Utah, Colorado, and Wyoming. Holding was converted and incorporated to a Delaware Corporation on March 8, 2017. On March 4, 2013, a majority interest in the Company was purchased by Energy Capital Partners (“ECP”), an energy‑focused private equity firm (see Note 18). On December 22, 2016, the Company restated and amended the Company’s Shareholders Agreement and certificate of formation in the state of Texas, approving a reverse stock split, such that each holder of common stock of the Company shall receive one share of common stock for every 170.4667 shares of previous common stock held. In conjunction, the Company amended the amount of authorized shares to 230,000,000 , of which 200,000,000 are common and 30,000,000 are preferred. On March 22, 2017, we consummated our initial public offering (“IPO”) in which 25,000,000 shares of our common stock, par value $0.001 per share, were sold at a public offering price of $14.00 per share, with 13,250,000 shares issued and sold by the Company and 11,750,000 shares sold by existing stockholders. We received net proceeds of approximately $170.1 million after deducting $10.9 million of underwriting discounts and commissions, and $4.5 million of other offering expenses. At closing, we used the proceeds (i) to repay $71.8 million in outstanding borrowings under the term loan, (ii) $86.8 million to fund the purchase of additional hydraulic fracturing units and other equipment, and (iii) the remaining for general corporate purposes. In connection with the IPO, the Company executed a stock split, such that each holder of common stock of the Company received 1.45 shares of common stock for every one share of previous common stock, and all 16,999,990 shares of our outstanding Series A preferred stock converted to common stock on a 1 :1 basis. Accordingly, any information related to or dependent upon the share or option counts in the 2017 , 2016 and 2015 consolidated financial statements and Note 13 Net Income (loss) Per Share , Note 14 Stock‑Based Compensation , Note 18 Equity Capitalization and Note 19 Quarterly Financial Data (Unaudited) have been updated to reflect the effect of the reverse stock split in December 2016 and the stock split in March 2017. Holding and Services are collectively referred to as the “Company” in the accompanying consolidated financial statements.

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	SIGNIFICANT ACCOUNTING POLICIES A summary of the significant accounting policies consistently applied in the preparation of the accompanying consolidated financial statements are as follows: Principles of Consolidation — The accompanying consolidated financial statements include the accounts of Holding and its wholly owned subsidiary, Services. All intercompany accounts and transactions have been eliminated in consolidation. Basis of Presentation — The accompanying consolidated financial statements and related notes have been prepared pursuant to the rules and regulations of the Securities Exchange Commission (SEC) and in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”). Use of Estimates — Management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and revenues and expenses during the reporting period. Such estimates include, but are not limited to, allowance for doubtful accounts, depreciation of property and equipment, estimates of fair value of property and equipment, estimates related to fair value of reporting units for purposes of assessing goodwill, estimates related to deferred tax assets and liabilities, including any related valuation allowances, and estimates of fair value of stock‑based compensation. Actual results could differ from those estimates. Revenue Recognition — The Company’s services are sold based upon contracts or other agreements with the customer that include fixed or determinable prices and do not include other post‑delivery obligations. Revenue for services is recognized as the services are rendered and when collectability is reasonably assured. Rates for services are typically determined per the contract or agreement with customers. Pressure Pumping — Pressure pumping consists of downhole pumping services including hydraulic fracturing (inclusive of acidizing services) and cementing. The Company recognizes revenues when services are performed, collection of the receivables is probable, and a price is fixed or determinable. The Company prices services for its pressure pumping by the job, project or day depending on the type of service performed and request from the customer. Drilling Services — Drilling services consists of surface air drilling and drilling, whereby we drill a well for a customer to a certain depth using a drilling rig and related equipment. The Company recognizes revenues either on a “turnkey” contract basis, in which a fixed and set price for the job is determinable, on a “daywork” contract basis, in which a stated rate per day is fixed and determinable, or on a “footage” contract basis, in which a rate per feet drilled is fixed and determinable. Other Completion & Production Services — Other completion & production services consists of coil tubing and flowback services whereby the Company recognizes revenues when services are performed either on a per job or per day or hourly rate, collections of receivables are probable, and a price is fixed or determinable. Cash and Cash Equivalents — The Company considers highly liquid investments with initial maturities of three months or less to be cash equivalents. Accounts Receivable — Accounts receivables are stated at the amount billed and billable to customers. The Company’s allowance for doubtful accounts is based on management’s evaluations of the collectability of each accounts receivable based on the customer’s payment history and general economic conditions. At December 31, 2017 , 2016 and 2015 , the allowance for doubtful accounts was $0.4 million , $0.6 million and $0.8 million , respectively. Inventories — Inventories, which consists only of raw materials, are stated at lower of average cost or net realizable value. Property and Equipment — The Company’s property and equipment are recorded at cost, less accumulated depreciation. Upon sale or retirement of property and equipment, the cost and related accumulated depreciation are removed from the balance sheet and the net amount, less proceeds from disposal, is recognized as a gain or loss in the statement of operations. The Company recorded a loss on disposal of assets of $39.1 million , $22.5 million and $21.3 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. The recorded loss on disposal is primarily attributed to the increased service intensity of pressure pumping activity which has resulted in a shorter useful life and faster replacement of certain components of the pressure pumping equipment. Depreciation — Depreciation of property and equipment is provided on the straight‑line method over the following estimated useful lives: Vehicles 1 ‑ 5 years Equipment 1 ‑ 20 years Leasehold improvements 5 ‑ 20 years Impairment of Long‑Lived Assets — In accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 360, Accounting for the Impairment or Disposal of Long‑Lived Assets , the Company reviews its long‑lived assets to be held and used whenever events or circumstances indicate that the carrying value of those assets may not be recoverable. An impairment loss is indicated if the sum of the expected future undiscounted cash flows attributable to the asset group is less than the carrying amount of such asset group. In this circumstance, the Company recognizes an impairment loss for the amount by which the carrying amount of the asset group exceeds the fair value of the asset group. No impairment was recorded in 2017 . The impairment recorded in 2016 was $6.3 million for property and equipment relating to the drilling asset group. The impairment recorded in 2015 was $36.6 million for property and equipment relating to the drilling and acidizing asset groups. The Company accounts for long‑lived assets to be disposed of at the lower of their carrying amount or fair value, less cost to sell once management has committed to a plan to dispose of the assets. Goodwill — Goodwill is the excess of the consideration transferred over the fair value of the tangible and identifiable intangible assets and liabilities recognized. Goodwill is not amortized. We perform an annual impairment test of goodwill as of December 31, or more frequently if circumstances indicate that impairment may exist. The determination of impairment is made by comparing the carrying amount of a reporting unit with its fair value, which is generally calculated using a combination of market and income approaches. If the fair value of the reporting unit exceeds the carrying value, no further testing is performed. If the fair value of the reporting unit is less than the carrying value, we consider goodwill to be impaired, and the amount of impairment loss is estimated and recorded in the statement of operations. In 2014, we acquired Blackrock Drilling, Inc. (“Blackrock”) for $1.8 million . The assets acquired from Blackrock were recorded as $0.6 million of equipment with the excess of the purchase price over the fair value of the assets recorded as goodwill of $1.2 million . The acquisition complemented our existing drilling operations. The transaction has been accounted for using the acquisition method of accounting and, accordingly, assets and liabilities assumed were recorded at their fair values as of the acquisition date. Based on our goodwill impairment test as of December 31, 2016, the Company concluded that there was an impairment of goodwill of $1.2 million related to the Blackrock acquisition. Accordingly, a $1.2 million impairment expense was recorded during the year ended December 31, 2016 , to fully write-down the goodwill related to Blackrock. Prior to the impairment write‑down, the goodwill related to the Blackrock acquisition of $1.2 million was recorded in the all other reportable segment. No impairment of Blackrock goodwill was recorded during the year ended December 31, 2015. In 2011, we acquired Technology Stimulation Services, LLC (“TSS”) for $24.4 million . The assets acquired from TSS were recorded as $15 million of equipment with the excess of the purchase price over fair value of the assets recorded as goodwill of $9.4 million . The acquisition complemented our existing pressure pumping business. The transaction has been accounted for using the acquisition method of accounting and, accordingly, assets and liabilities assumed were recorded at their fair values as of the acquisition date. Based on our goodwill impairment tests as of December 31, 2017 , 2016 and 2015 , we concluded that the goodwill related to TSS acquisition was determined not to be impaired. The goodwill related to the TSS acquisition of $9.4 million is recorded in the pressure pumping reportable segment. Intangible Assets — Intangible assets with finite useful lives are amortized on a basis that reflects the pattern in which the economic benefits of the intangible assets are realized, which is generally on a straight‑line basis over the asset’s estimated useful life. Income Taxes — Income taxes are accounted for under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the consolidated financial statements. Under this method, deferred tax assets and liabilities are determined on the basis of differences between the consolidated financial statements and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. We recognize deferred tax assets to the extent that we believe these assets are more likely than not to be realized. In making such a determination, we consider all positive and negative evidences, including future reversals of existing taxable temporary differences, projected future taxable income, and the results of recent operations. If we determine that we would be able to realize our deferred tax assets in the future in excess of their net recorded amount, we would make an adjustment to the deferred tax asset valuation allowance, which would reduce the provision for income taxes. Advertising Expense — All advertising costs are expensed as incurred. For the years ended December 31, 2017 , 2016 and 2015 , advertising expense was $0.8 million , $0.4 million and $0.9 million , respectively. Deferred Loan Costs — The Company capitalized certain costs in connection with obtaining its borrowings, including lender, legal, and accounting fees. These costs are being amortized over the term of the related loan using the straight‑line method (which approximates the interest method). Deferred loan costs amortization is included in interest expense. Unamortized deferred loan costs associated with loans paid off or refinanced with different lenders are charged off in the period in which such an event occurs. Deferred loan costs are classified as a reduction of long‑term debt or in certain instance as an asset in the consolidated balance sheet. Amortization of deferred loan costs is recorded as interest expense in the statement of operations, and during the years ended December 31, 2017 , 2016 and 2015 , the amount of expense recorded was $3.4 million , $2.1 million and $1.4 million , respectively. Stock-Based Compensation — The Company recognizes the cost of stock‑based awards on a straight‑line basis over the requisite service period of the award, which is usually the vesting period under the fair value method. Total compensation cost is measured on the grant date using fair value estimates. Insurance Financing — The Company annually renews their commercial insurance policies and records a prepaid insurance asset and amortizes it monthly over the coverage period. The Company may choose to finance a portion of the premiums and will make repayments monthly over ten months in equal installments. Concentration of Credit Risk — The Company’s assets that are potentially subject to concentrations of credit risk are cash and cash equivalents and trade accounts receivable. Cash balances are maintained in financial institutions, which at times exceed federally insured limits. The Company monitors the financial condition of the financial institutions in which accounts are maintained and has not experienced any losses in such accounts. The receivables of the Company are spread over a number of customers, a majority of which are credible operators and suppliers to the oil and natural gas industries. The Company performs ongoing credit evaluations as to the financial condition of its customers with respect to trade receivables. In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers (Topic 606) . ASU No. 2014-09 requires entities to recognize revenue to depict transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU No. 2014-09 requires entities to disclose both qualitative and quantitative information that enables users of the consolidated financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers, including disclosure of significant judgments affecting the recognition of revenue. ASU No. 2014-09 was originally effective for annual periods beginning after December 15, 2016, using either the retrospective or cumulative effect transition method. On August 12, 2015, the FASB issued ASU No. 2015-14, which defers the effective date of the revenue standard, ASU No. 2014-09, by one year for all entities and permits early adoption on a limited basis. We have completed our evaluation of ASU No. 2014-09, and the adoption of this guidance will not materially affect our revenue recognition. However, there will be additional disclosures on our consolidated financial statements relating to the adoption of this standard. I n July 2015, the FASB issued ASU No. 2015-11, Simplifying the Measurement of Inventory, which requires entities to measure most inventory "at the lower of cost and net realizable value," thereby simplifying the current guidance under which an entity must measure inventory at the lower of cost or market. ASU No. 2015-11 does not apply to inventories that are measured by using either the last-in, first-out method or the retail inventory method. The amendments in ASU No. 2015-11 are effective for fiscal years beginning after December 15, 2016. The ASU became effective for us in 2017 and the adoption of this guidance did not materially affect our consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases , a new standard on accounting for leases. The ASU introduces a lessee model that brings most leases on the balance sheet. The new standard also aligns many of the underlying principles of the new lessor model with those in the current accounting guidance as well as the FASB’s new revenue recognition standard. However, the ASU eliminates the use of bright-line tests in determining lease classification as required in the current guidance. The ASU also requires additional qualitative disclosures along with specific quantitative disclosures to better enable users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The new standard is effective for annual reporting periods beginning after December 15, 2018, including periods within that reporting period, using a modified retrospective approach. Early adoption is permitted. We have not completed an evaluation of the impact the pronouncement will have on our consolidated financial statements and related disclosures. In March 2016, the FASB issued ASU No. 2016-09, Compensation- Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which modifies several aspects of the accounting for share-based payment transactions including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The new standard is effective for fiscal years and interim periods beginning after December 15, 2016, with early adoption permitted. The ASU became effective for us in 2017 and the adoption of this guidance did not materially affect our consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment , which removes the requirement to compare the implied fair value of goodwill with its carrying amount as part of step two of the goodwill impairment test. As a result, under this ASU, an entity would recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. This pronouncement is effective for impairment tests in fiscal years beginning after December 15, 2019, on a prospective basis. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. We believe that the adoption of this guidance will not materially affect our consolidated financial statements.

SUPPLEMENTAL CASH FLOWS INFORMA

SUPPLEMENTAL CASH FLOWS INFORMATION	12 Months Ended
	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
SUPPLEMENTAL CASH FLOWS INFORMATION	SUPPLEMENTAL CASH FLOWS INFORMATION December 31, ($ in thousands) 2017 2016 2015 Supplemental cash flows disclosures Interest paid $ 3,966 $ 18,249 $ 20,531 Income taxes paid $ — $ 3 $ 1,295 Supplemental disclosure of non‑cash activities Capital expenditures included in accounts payable $ 33,850 $ 3,176 $ 8,821 Conversion of preferred stock to common stock at Initial Public Offering $ 162,511 $ — $ —

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (i.e., the “exit price”) in an orderly transaction between market participants at the measurement date. In determining fair value, the Company uses various valuation approaches and establishes a hierarchy for inputs used in measuring fair value that maximizes the use of relevant observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used, when available. Observable inputs are inputs that market participants would use in pricing the asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the assumptions other market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. The hierarchy is broken down into three levels based on the observability of inputs as follows: Level 1 — Valuations based on quoted prices in active markets for identical assets or liabilities that the Company has the ability to access. Valuation adjustments and block discounts are not applied to Level 1 instruments. Since valuations are based on quoted prices that are readily and regularly available in an active market, valuation of these instruments does not entail a significant degree of judgment. Level 2 — Valuations based on one or more quoted prices in markets that are not active or for which all significant inputs are observable, either directly or indirectly. Level 3 — Valuations based on inputs that are unobservable and significant to the overall fair value measurement. A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. Assets and Liabilities Measured at Fair Value on a Recurring Basis Our financial instruments include cash and cash equivalents, accounts receivables, accounts payable, and a derivative financial instrument. The estimated fair value of our financial instruments — cash and cash equivalent, accounts receivable and accounts payable at December 31, 2017 , 2016 and 2015 approximates their carrying value as reflected in our consolidated balance sheets because of their short‑term nature. We use a derivative financial instrument, an interest rate swap, to manage interest rate risk. Our policies do not permit the use of derivative financial instruments for speculative purposes. We did not designate the interest rate swap as a hedge for accounting purposes. We record all derivatives as of the end of our reporting period in our consolidated balance sheet at fair value, which is based on quoted market prices, which represents a level 1 in the fair value measurement hierarchy. We may be exposed to credit losses in the event of nonperformance by counterparties to the interest rate swap. The counterparty of the interest rate swap is a lender under our term loan and a credible, large institution, and the Company does not believe there is significant or material credit risk upon settling the contract. The fair value of the interest rate swap liability at December 31, 2017 , 2016 and 2015 was $0 , $0.3 million and $0.5 million , respectively. Based on quoted market prices as of December 31, 2017 , 2016 and 2015 , for contracts with similar terms and maturity date, as provided by the counterparty, we recorded a gain of $0.3 million , $0.2 million and a loss of $0.3 million , respectively. Assets Measured at Fair Value on a Nonrecurring Basis Assets measured at fair value on a nonrecurring basis at December 31, 2017 and 2016 , respectively, are set forth below: Estimated fair value measurements Balance Quoted prices in Significant other Significant other Total gains ($ in thousands): 2017: Property and equipment, net $ — $ — $ — $ — $ — Goodwill $ — $ — $ — $ — $ — 2016: Property and equipment, net $ 8,700 $ — $ 8,700 $ — $ (6,305 ) Goodwill $ 9,425 $ — $ — $ 9,425 $ (1,177 ) No impairment was recorded for our property and equipment during the year ended December 31, 2017 . In 2016, the depressed cash flows and continued decline in utilization of our drilling assets were indicative of potential impairment, resulting in the Company comparing the carrying value of the drilling assets with its estimated fair value. We determined that the carrying value of the drilling assets was greater than its estimated fair value and accordingly, an impairment expense was recorded. In 2016, the non‑cash asset impairment charges for drilling was $6.3 million , which had a net carrying value of $15.0 million prior to the impairment write‑down. In 2015, the non‑cash asset impairment charges for drilling and acidizing was $28.6 million and $8 million , respectively, aggregating to a total of $36.6 million . In 2015, the drilling and acidizing assets groups had a net carrying value of $48.1 million and $15.6 million prior to the impairment write‑down. See Note 7, “Impairment of Long‑Lived Assets.” We generally apply fair value techniques to our reporting units on a nonrecurring basis associated with valuing potential impairment loss related to goodwill. Our estimate of the reporting unit fair value is based on a combination of income and market approaches, Level 1 and 3, respectively, in the fair value hierarchy. The income approach involves the use of a discounted cash flow method, with the cash flow projections discounted at an appropriate discount rate. The market approach involves the use of comparable public companies market multiples in estimating the fair value. Significant assumptions include projected revenue growth, capital expenditures, utilization, gross margins, discount rates, terminal growth rates, and weight allocation between income and market approaches. If the reporting unit's carrying amount exceeds its fair value, we consider goodwill impaired, and the impairment loss is recorded in the period. There were no additions to, or disposal of, goodwill during the year ended December 31, 2017 , 2016 and 2015 . Based on our annual goodwill impairment test, no impairment of goodwill was recorded for the year ended December 31, 2017 . At December 31, 2016, we estimated the fair value of our surface drilling reporting unit to be $3.8 million and its carrying value was $4.2 million . As a result of the potential impairment with the carrying value exceeding the estimated fair value, we then further determined the implied fair value of the $1.2 million goodwill for the surface drilling reporting unit to be $0 . Accordingly, we recorded an impairment expense of $1.2 million . The impairment expense was attributable to the challenging oil and gas market and slow recovery of crude oil prices, all of which adversely impacted on our expected future cash flows for the surface drilling reporting unit. There was no impairment of goodwill in 2015.

INTANGIBLE ASSETS

INTANGIBLE ASSETS	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
INTANGIBLE ASSETS	INTANGIBLE ASSETS Intangible assets are composed of internally developed software. Intangible assets are amortized on a straight‑line basis with a useful life of five years. Amortization expense included in net income (loss) for the years ended December 31, 2017 , 2016 and 2015 was $0.3 million , $0.3 million and $0.3 million , respectively. At December 31, 2017 and 2016 , respectively, the company’s intangible assets subject to amortization are as follows: ($ in thousands) 2017 2016 Internally developed software $ 1,440 $ 1,440 Less accumulated amortization 1,139 851 Intangible assets — net $ 301 $ 589 Estimated remaining amortization expense for each of the subsequent fiscal years is expected to be as follows: ($ in thousands) Year Estimated 2018 $ 288 2019 13 Total $ 301 The average amortization period remaining is approximately 1.05 years .

PROPERTY AND EQUIPMENT

PROPERTY AND EQUIPMENT	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
PROPERTY AND EQUIPMENT	PROPERTY AND EQUIPMENT Property and equipment consisted of the following at December 31, 2017 and 2016 , respectively: ($ in thousands) 2017 2016 Equipment and vehicles $ 646,800 $ 402,641 Leasehold improvements 4,987 4,500 Subtotal 651,787 407,141 Less accumulated depreciation 180,877 143,279 Property and equipment — net $ 470,910 $ 263,862

IMPAIRMENT OF LONG_LIVED ASSETS

IMPAIRMENT OF LONG‑LIVED ASSETS IMPAIRMENT OF LONG‑LIVED ASSETS	12 Months Ended
	Dec. 31, 2017
Impairment of Long-lived Assets [Abstract]
IMPAIRMENT OF LONG‑LIVED ASSETS	IMPAIRMENT OF LONG‑LIVED ASSETS Whenever events or circumstances indicate that the carrying value of long‑lived assets may not be recoverable, the Company reviews the carrying value of long‑lived assets, such as property and equipment and other assets to determine if they are recoverable. If any long‑lived assets are determined to be unrecoverable, an impairment expense is recorded in the period. Asset recoverability is estimated using undiscounted future net cash flows at the lowest identifiable level, excluding interest expense and one‑time other income and expense adjustments. The Company determined the lowest level of identifiable cash flows to be at the asset group level, which consists of hydraulic fracturing (inclusive of acidizing), cementing, coil tubing, flowback, drilling, and surface drilling. During the year ended December 31, 2017 , no impairment expense was recorded for any of our assets group. During the year ended December 31, 2016 , the gradual shift from vertical to horizontal drilling rigs in the Permian Basin led to the deterioration in utilization of our drilling rigs, and we expected undiscounted future cash flows to be lower than the carrying value of the drilling assets. Given that the carrying value of the drilling assets may not be recoverable, the Company estimated the fair value of the asset group and compared it to its carrying value. Potential impairment exists if the estimated undiscounted future net cash flows for a given asset group is less than the carrying amount of the asset group. The impairment expense is determined by comparing the estimated fair value with the carrying value of the related asset, and any excess amount by which the carrying value exceeds the fair value is recorded as an impairment expense in the period. At December 31, 2016, the estimated fair value of the drilling asset group of $8.7 million was determined using the market approach, which represents a level 2 in the fair value measurement hierarchy. Our fair value estimates required us to use significant other observable inputs including assumptions related to replacement cost, among others. According an impairment expense of $6.3 million was recorded in 2016 as the carrying value of the drilling asset group of $15.0 million was greater than its then estimated fair value. All other assets groups were determined to be recoverable in 2016. During the year ended December 31, 2015 , the asset groups identified to have impairment were drilling and acidizing, with estimated fair values of approximately $18.8 million and $6.3 million , respectively. The estimated fair values of the drilling and acidizing asset groups were determined using the cost approach, which represents a level 2 in the fair value measurement hierarchy. During the year ended December 31, 2015 , the impairment expense for drilling and acidizing was $28.6 million and $8.0 million , respectively.

DEFERRED REVENUE REBATE

DEFERRED REVENUE REBATE	12 Months Ended
	Dec. 31, 2017
Deferred Revenue Disclosure [Abstract]
DEFERRED REVENUE REBATE	DEFERRED REVENUE REBATE In November 2011, the Company acquired certain oilfield fracturing equipment from a customer and agreed to provide future fracturing services to the customer for a period of 78 months in exchange for a 12% $25 million note payable to the customer. The Company recorded the fracturing equipment at its estimated fair value of approximately $13 million and assigned the remaining value of approximately $12 million to a deferred revenue rebate account to be amortized over the customer’s 78 ‑month service period. In March 2013, the Company repaid the note payable to the customer. For each of the years ended December 31, 2017 , 2016 and 2015 the Company recorded $1.8 million of amortization as a reduction of revenue.

LONG_TERM DEBT

LONG‑TERM DEBT	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
LONG‑TERM DEBT	LONG‑TERM DEBT 2013 Term Loan and Revolving Credit Facility On September 30, 2013, we entered into a term loan in the amount of $220 million ("Term Loan") with a $40 million revolving credit line ("Revolving Credit Facility" ) . Borrowings under the Term Loan and Revolving Credit Facility accrued interest at LIBOR plus 6.25% , subject to a 1% LIBOR floor, and were secured by a first priority lien and security interest in all assets of the Company. Proceeds from the Term Loan were used to pay off 100% of our debt outstanding, including accrued interest, at September 30, 2013, with excess proceeds from the Term Loan and the Revolving Credit Facility used to fund growth and working capital needs. The Term Loan and Revolving Credit Facility were scheduled to mature on September 30, 2019 and September 30, 2018, respectively, with quarterly and monthly payments of principal and interest, respectively. Under the Term Loan and Revolving Credit Facility we were required to comply, subject to certain exceptions and materiality qualifiers, with certain customary affirmative and negative covenants, including, but not limited to, covenants pertaining to reporting, insurance, collateral maintenance, change of control, transactions with affiliates, distributions, and limitations on additional indebtedness. In addition, the Term Loan and Revolving Credit Facility included a maximum leverage ratio of 3.5 x EBITDA (earnings before interest, taxes, depreciation, and amortization) to total debt, which became effective March 31, 2014. In 2015, given the then near-term economic uncertainty and volatility of commodity prices, we determined that we were likely to be out of compliance with the leverage ratio covenant under the Term Loan and Revolving Credit Facility at the March 31, 2016 test date. Accordingly, the Company and its equity sponsor, Energy Capital Partners ("ECP"), commenced negotiations with the lenders to amend the covenants and leverage ratio in the Term Loan and Revolving Credit Facility. The resulting amendment and waiver agreement was executed on June 8, 2016. Under the terms of the amendment, ECP infused $40.0 million of additional equity into the Company, $10.0 million of which was reserved for working capital, with up to $30.0 million available to repurchase debt. A minority shareholder also infused $0.4 million alongside ECP to prevent dilution. The amendment and waiver also suspended the leverage ratio test until June 30, 2017, and provided us with 30 days to deliver any past-due financial statements. Gain on Extinguishment of Debt — in connection with the amendment to the Term Loan and Revolving Credit Facility, we initiated an auction process with the lenders to repurchase a portion of debt for a price of $0.80 , a 20% discount to par value. The auction settled on June 16, 2016 as the Company repurchased a total amount of $37.5 million of debt for $30.0 million plus $0.5 million in debt extinguishment auction costs, leading to a gain on extinguishment of debt of $7.0 million . On January 13, 2017, we repaid $75 million of the outstanding balance under the Term Loan and repaid the remaining balance of $13.5 million under the Revolving Credit Facility using a portion of the proceeds from the private placement offering. On March 22, 2017, we retired the $71.8 million remaining balance of the Term Loan, along with accrued interest, using a portion of the proceeds from our IPO. Each of the Term Loan and Revolving Credit Facility were terminated in accordance with their terms upon the repayment of outstanding borrowings. Equipment Financing On November 24, 2015, we entered into a 36 months financing arrangement for three hydraulic fracturing units in the amount of $25 million , and a portion of the proceeds were used to pay off the previous manufacturer notes, with the remainder being used for additional liquidity. On June 30, 2017, we entered into a financing arrangement for the purchase of light vehicles. As of December 31, 2017 , the outstanding balance for certain light vehicles purchased under this financing arrangement is $4.7 million . ABL Credit Facility On March 22, 2017, we entered into a new revolving credit facility with a $150 million borrowing capacity ("ABL Credit Facility"). Borrowings under the ABL Credit Facility accrue interest based on a three-tier pricing grid tied to availability, and we may elect for loans to be based on either LIBOR or base rate, plus the applicable margin, which ranges from 1.75% to 2.25% for LIBOR loans and 0.75% to 1.25% for base rate loans, with no LIBOR floor. Borrowings under the ABL Credit Facility are secured by a first priority lien and security interest in substantially all assets of the Company. The ABL Credit Facility has a tenor of 5 years and a borrowing base of 85% of eligible accounts receivable less customary reserves. Under this facility we are required to comply, subject to certain exceptions and materiality qualifiers, with certain customary affirmative and negative covenants, including, but not limited to, covenants pertaining to our ability to incur liens, indebtedness, changes in the nature of our business, mergers and other fundamental changes, disposal of assets, investments and restricted payments, amendments to our organizational documents or accounting policies, prepayments of certain debt, dividends, transactions with affiliates, and certain other activities. In addition, the ABL Credit Facility includes a Springing Fixed Charge Coverage Ratio of 1.0 x when excess availability is less than the greater of (i) 10% of the lesser of the facility size and the Borrowing Base and (ii) $12.0 million . The ABL has a commitment fee of 0.38% , which reduces to 0.25% if utilization is greater than 50% of the borrowing base. On February 22, 2018, we entered into an amendment with our lenders to increase the capacity of the ABL Credit Facility. The amendment increased total capacity under the facility from $150 million to $200 million . The fair values of the ABL Credit Facility, Revolving Credit Facility and equipment financing approximate their carrying values. Our Term Loan was completely retired at December 31, 2017 . The estimated fair value of the Term Loan at December 31, 2016 was approximately 89% of its carrying value or $130.6 million compared to $146.8 million carrying value. Total debt consisted of the following notes at December 31, 2017 and 2016 , respectively: ($ in thousands) 2017 2016 ABL Credit Facility $ 55,000 $ — 6.25% "Term loan" — 146,750 Revolving Credit Facility — 13,500 Equipment financing 17,942 19,193 Total debt 72,942 179,443 Less deferred loan costs, net of amortization — 3,116 Subtotal 72,942 176,327 Less current portion of long-term debt 15,764 16,920 Total long-term debt, net of deferred loan costs $ 57,178 $ 159,407 The loan origination costs relating to the ABL Credit Facility are classified as an asset in the balance sheet. Annual Maturities — Scheduled annual maturities of total debt are as follows at December 31, 2017 : ($ in thousands) 2018 $ 15,764 2019 2,142 2020 36 2021 — 2022 and thereafter 55,000 Total $ 72,942

ACCRUED LIABILITIES

ACCRUED LIABILITIES	12 Months Ended
	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
ACCRUED LIABILITIES	ACCRUED LIABILITIES Accrued liabilities consisted of the following at December 31, 2017 and 2016 , respectively: ($ in thousands) 2017 2016 Accrued insurance $ 2,762 $ 2,900 Accrued payroll and related expenses 10,110 4,729 Other 3,735 5,990 Total $ 16,607 $ 13,619

EMPLOYEE BENEFIT PLAN

EMPLOYEE BENEFIT PLAN	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
EMPLOYEE BENEFIT PLAN	EMPLOYEE BENEFIT PLAN The Company has a 401(k) plan whereby all employees with six months of service may contribute up to $15,000 to the plan annually. The employees vest in the Company contributions to the 401(k) plan 25% per year, beginning in the employee’s second year of service, with full vesting occurring after five years of service. The employees are fully vested in their contributions when made. The Company matches employee contributions 20 cents on the dollar up to 10% of gross salary. During the years ended December 31, 2017 , 2016 and 2015 , the recorded expense under the plan was $0.2 million , $0.2 million and $0.2 million , respectively.

REPORTABLE SEGMENT INFORMATION

REPORTABLE SEGMENT INFORMATION	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
REPORTABLE SEGMENT INFORMATION	REPORTABLE SEGMENT INFORMATION The Company has six operating segments for which discreet financial information is readily available: hydraulic fracturing, cementing, coil tubing, flowback, surface drilling, and drilling. During the fourth quarter of 2017, our acidizing operation was consolidated into our hydraulic fracturing operating segment, and we no longer maintain discreet financial information for acidizing, resulting in a reduction in the number of our operating segments from seven previously reported in 2016 to six operating segments. The change in the number of our operating segments did not impact our reportable segment information reported during the years ended December 31, 2017 , 2016 and 2015 . Our operating segments represent how the chief operating decision maker (CODM) evaluates performance and allocate resources. In accordance with Accounting Standards Codification (ASC) 280 — Segment Reporting , the Company has one reportable segment (pressure pumping) comprised of the hydraulic fracturing and cementing operating segments. All other operating segments and corporate administrative expenses are included in the “all other” category in the table below. Inter‑segment revenues are not material and were not shown separately in the table below. The Company manages and assesses the performance of the reportable segment by its adjusted EBITDA (earnings before other income (expense), interest, taxes, depreciation & amortization, stock-based compensation expense, impairment expense, (gain)/loss on disposal of assets, gain on extinguishment of debt and other unusual or nonrecurring expenses or income) . A reconciliation from segment level financial information to the consolidated statement of operations is provided in the table below. ($ in thousands) Pressure All Other Total Year ended December 31, 2017 Service revenue $ 945,040 $ 36,825 $ 981,865 Adjusted EBITDA $ 145,122 $ (7,679 ) $ 137,443 Depreciation and amortization $ 51,155 $ 4,473 $ 55,628 Capital expenditures $ 300,406 $ 4,893 $ 305,299 Goodwill $ 9,425 $ — $ 9,425 Total assets $ 688,279 $ 30,753 $ 719,032 Pressure All Other Total Year ended December 31, 2016 Service revenue $ 409,014 $ 27,906 $ 436,920 Adjusted EBITDA $ 15,656 $ (7,840 ) $ 7,816 Depreciation and amortization $ 37,282 $ 6,260 $ 43,542 Property and equipment impairment expense $ — $ 6,305 $ 6,305 Goodwill impairment expense $ — $ 1,177 $ 1,177 Capital expenditures $ 45,473 $ 535 $ 46,008 Goodwill $ 9,425 $ — $ 9,425 Total assets $ 501,906 $ 39,516 $ 541,422 Pressure All Other Total Year ended December 31, 2015 Service revenue $ 510,198 $ 59,420 $ 569,618 Adjusted EBITDA $ 62,540 $ (2,391 ) $ 60,149 Depreciation and amortization $ 38,369 $ 11,765 $ 50,134 Property and equipment impairment expense $ 7,980 $ 28,629 $ 36,609 Capital expenditures $ 69,029 $ 2,647 $ 71,676 Goodwill $ 9,425 $ 1,177 $ 10,602 Total assets $ 398,449 $ 48,005 $ 446,454 Reconciliation of net income (loss) to adjusted EBITDA: ($ in thousands) Pressure All Other Total Year ended December 31, 2017 Net income (loss) $ 50,417 $ (37,804 ) $ 12,613 Depreciation and amortization 51,155 4,473 55,628 Interest expense — 7,347 7,347 Income tax expense — 3,128 3,128 Loss on disposal of assets 38,059 1,027 39,086 Stock‑based compensation — 9,489 9,489 Other expense — 1,025 1,025 Other general and administrative expense (1) — 722 722 Deferred IPO Bonus 5,491 2,914 8,405 Adjusted EBITDA $ 145,122 $ (7,679 ) $ 137,443 Year ended December 31, 2016 Pressure All Other Total Net loss $ (45,316 ) $ (7,831 ) $ (53,147 ) Depreciation and amortization 37,282 6,260 43,542 Interest expense — 20,387 20,387 Income tax benefit — (27,972 ) (27,972 ) Loss on disposal of assets 23,690 (1,161 ) 22,529 Property and equipment impairment expense — 6,305 6,305 Goodwill impairment expense — 1,177 1,177 Gain on extinguishment of debt — (6,975 ) (6,975 ) Stock‑based compensation — 1,649 1,649 Other expense — 321 321 Adjusted EBITDA $ 15,656 $ (7,840 ) $ 7,816 Pressure All Other Total Year ended December 31, 2015 Net loss $ (5,022 ) $ (40,831 ) $ (45,853 ) Depreciation and amortization 38,369 11,765 50,134 Interest expense — 21,641 21,641 Income tax benefit — (25,388 ) (25,388 ) Loss on disposal of assets 21,213 55 21,268 Property and equipment impairment expense 7,980 28,629 36,609 Stock‑based compensation — 1,239 1,239 Other expense — 499 499 Adjusted EBITDA $ 62,540 $ (2,391 ) $ 60,149 (1) Other general and administrative expense relates to legal settlement expense. Major Customers For the years ended December 31, 2017 , 2016 and 2015 , the Company had revenue from the following significant customers that accounted for the following percentages of the Company’s total revenue: 2017 2016 2015 Customer A 15.0 % 18.0 % 12.5 % Customer B 13.8 % 12.5 % 8.8 % Customer C 12.7 % 8.7 % 14.2 % Customer D 12.6 % 7.0 % 11.1 % Customer E 11.8 % — % — % For the year ended December 31, 2017 , pressure pumping made up 99.9% of Customer A, 99.2% of Customer B, 99.9% of Customer C, 99.8% of Customer D and 95.5% of customer E. For the year ended December 31, 2016 , pressure pumping made up 96% of Customer A, 99% of Customer B, 100% of Customer C and 99% of Customer D. For the year ended December 31, 2015 , pressure pumping made up 99% of Customer A, 100% of Customer B, 88% of Customer C and 99% of Customer D.

NET INCOME (LOSS) PER SHARE

NET INCOME (LOSS) PER SHARE	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
NET INCOME (LOSS) PER SHARE	NET INCOME (LOSS) PER SHARE Basic net income (loss) per common share is computed by dividing the net income (loss) relevant to the common stockholders by the weighted-average number of shares outstanding during the year. Diluted net income (loss) per common share uses the same net income (loss) divided by the sum of the weighted-average number of shares of common stock outstanding during the period, plus dilutive effects of options, performance and restricted stocks units outstanding during the period calculated using the treasury method and the potential dilutive effects of preferred stocks (if any) calculated using the if-converted method. The table below shows the calculations for years ended December 31, 2017 , 2016 and 2015 . (In thousands, except for per share data) 2017 2016 2015 Numerator (both basic and diluted) Net income (loss) relevant to common stockholders $ 12,613 $ (53,147 ) $ (45,853 ) Denominator Denominator for basic income (loss) per share 76,371 44,787 34,993 Dilutive effect of stock options 2,903 — — Dilutive effect of performance stock units 59 — — Dilutive effect of non-vested restricted stock units 250 — — Denominator for diluted income (loss) per share 79,583 44,787 34,993 Basic net income (loss) per common share $ 0.17 $ (1.19 ) $ (1.31 ) Diluted net income (loss) per common share $ 0.16 $ (1.19 ) $ (1.31 ) As shown in the table below, the following non-vested restricted stock units, preferred stock, performance stock units, and stock options have not been included in the calculation of diluted income (loss) per share for years ended December 31, 2017 , 2016 and 2015 as they would be anti-dilutive to the calculation above. (Count in thousands) 2017 2016 2015 Stock options — 4,646 3,486 Preferred stock — 17,000 — Performance stock units — — — Non-vested restricted stock units — 372 372 — 22,018 3,858

STOCK_BASED COMPENSATION

STOCK‑BASED COMPENSATION	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK‑BASED COMPENSATION	STOCK‑BASED COMPENSATION Effective March 4, 2013, we adopted the ProPetro Stock Option Plan pursuant to which our Board of Directors may grant stock options or other stock-based awards to key employees, consultants, and directors. The Plan, as amended, is authorized to grant up to 4,645,884 shares of common stock to be issued upon exercise of the options. The Company’s share price used to estimate the fair value of the option at the grant date was based on a combination of income and market approaches, which are highly complex and sensitive. The income approach involves the use of a discounted cash flow method, with cash flow projections discounted at an appropriate discount rate. The market approach involves the use of comparable public companies market multiples in estimating the fair value of the Company’s stock. The expected term used to calculate the fair value of all options considers the vesting date and the grant’s expiration date. The expected volatility was estimated by considering comparable public companies, and the risk free rate is based on the U.S treasury yield curve as of the grant date. The dividend assumption is based on historical experience. After becoming a public company, the market price was used to determine the market value of our common stock. Prior to 2015, the Company had granted a total of 3,499,228 options with an exercise price of $3.96 per option, and all options expire 10 years from the date of grant. On June 14, 2013, we granted 2,799,408 stock option awards to certain key employees and directors that shall vest and become exercisable based upon the achievement of a service requirement. The options vest in 25% increments for each year of continuous service and an option becomes fully vested upon the optionee’s completion of the fourth year of service. The contractual term for the options awarded is 10 years. For the years ended December 31, 2017 , 2016 and 2015 , the Company recognized $0.7 million , $1.2 million and $1.2 million , respectively, in compensation expense related to these stock options. The fair value of each option award granted is estimated on the date of grant using the Black-Scholes option-pricing model. The fair value of the options was estimated at the date of grant using the following assumptions: Expected volatility 45 % Expected dividends $ — Expected term (in years) 6.25 Risk free rate 1.35 % On December 1, 2013, we granted 699,820 stock option awards to certain key employees which were scheduled to vest in four substantially equal annual installments, subject to service and performance requirements and acceleration upon a change in control. As of December 31, 2016 and 2015 the performance requirements were not considered to be probable of achievement for any of the outstanding option awards and 114,456 options were forfeited during the year ended December 31, 2016. Accordingly, we did not recognize any compensation expense related to these stock options during the years ended December 31, 2016 and 2015. Effective March 16, 2017, we terminated the options in connection with the IPO and approved a cash bonus totaling $5.1 million to the holders of the options. The contractual term for the options awarded is 10 years. The fair value of each option award granted is estimated on the date of grant using the Black-Scholes option-pricing model. The fair value of the options was estimated at the date of grant using the following assumptions: Expected volatility 45 % Expected dividends $ — Expected term (in years) 6.25 Risk free rate 1.83 % On July 19, 2016, we granted 1,274,549 stock option awards to certain key employees and directors which are scheduled to vest in five substantially equal semi-annual installments commencing in December 2016, subject to a continuing services requirement. The contractual term for the options awarded is 10 years. For the year ended December 31, 2017 , we recognized the remaining $1.8 million in stock compensation expense related to these stock options, as the Company fully accelerated vesting of the options in connection with the IPO, and for the years ended December 31, 2016 and 2015 , the Company recognized $0.4 million and $0 , respectively, in compensation expense related to these stock options. The fair value of each option award granted is estimated on the date of grant using the Black- Scholes option-pricing model. The fair value of the options was estimated at the date of grant using the following assumptions: Expected volatility 55 % Expected dividends $ — Expected term (in years) 5.8 Risk free rate 1.22 % In March 2017, our shareholders approved the ProPetro 2017 Incentive Award Plan ("IAP") pursuant to which our Board of Directors may grant stock options, restricted stock units ("RSUs"), performance stock units ("PSUs"), or other stock-based awards to key employees, consultants, directors and employees. The IAP authorizes up to 5,800,000 shares of common stock to be issued under awards granted pursuant to the plan. On March 16, 2017, we granted 793,738 stock option awards to certain key employees and directors pursuant to the IAP which are scheduled to vest in four substantially equal annual installments, subject to a continuing service requirement. The contractual term for the options awarded is 10 years. For the years ended December 31, 2017 , 2016 and 2015 , the Company recognized $0.5 million , $0 and $0 , respectively, in compensation expense related to these stock options. The fair value of each stock option award granted is estimated on the date of grant using the Black- Scholes option-pricing model. The fair value of the options was estimated at the date of grant using the following assumptions: Expected volatility 18 % Expected dividends $ — Expected term (in years) 6.25 Risk free rate 2.23 % A summary of the stock option activity for the year ended December 31, 2017 is presented below. Number Weighted Outstanding at January 1, 2017 4,645,884 $ 3.49 Granted 793,738 $ 14.00 Exercised (226,194 ) $ 3.96 Forfeited (5,148 ) $ 14.00 Expired — $ — Canceled (571,927 ) $ 3.96 Outstanding at December 31, 2017 4,636,353 $ 5.20 Exercisable at December 31, 2017 3,847,763 $ 3.39 The weighted average grant-date fair value of stock options granted during the years ended December 31, 2017 , 2016 and 2015 was $3.35 , $1.77 and $0 , respectively. As of December 31, 2017 , the aggregate intrinsic value for our outstanding stock options was $69.4 million , and the aggregate intrinsic value for our exercisable stock options was $64.5 million . The aggregate intrinsic value for the exercised stock options during the year was $2.3 million . The remaining contractual term for the outstanding and exercisable stock options as of December 31, 2017 , were 6.9 years and 6.4 years, respectively. Restricted Stock Units (Non-Vested Stock) and Performance Stock Units On September 30, 2013, our Board of Directors authorized and granted 372,335 restricted stock units (RSUs) to a key executive. Each RSU represents the right to receive one share of common stock of the Company at par value $0.001 per share. Under the terms of the award, the shares of common stock subject to the RSUs were to be paid to the grantee upon change in control, regardless of whether the grantee was affiliated with the Company on the settlement date. The fair value of the RSUs is measured as the price of the Company’s shares on the grant date, which was estimated to be $3.89 . The share price used to estimate the fair value of the RSU at the grant date was based on a combination of income and market approaches, which are highly complex and sensitive. The income approach involves the use of a discounted cash flow method, with the cash flow projections discounted at an appropriate discount rate. The market approach involves the use of comparable public companies market multiples in estimating the fair value of the Company’s stock. Effective March 22, 2017, the Board of Directors canceled these RSUs and issued 372,335 new RSUs to the grantee. These issued RSUs are effectively identical to the RSUs granted in 2013, provided, however, that the RSUs will now be payable in full on March 22, 2018. The fair value of the RSUs issued on March 22, 2017, was based on the Company's closing stock market price at the grant date. In connection with the IPO, we fully recognized the stock compensation expense related to the re-issued RSUs. On June 5, 2017, our Board of Directors granted 319,250 RSUs to employees, directors and executives pursuant to the IAP. Each RSU represents the right to receive one share of common stock. The fair value of the RSUs is based on the closing share price of our common stock on the date of grant. For the years ended December 31, 2017 , 2016 and 2015 the recorded stock compensation expense for all RSUs was $6.2 million , $0 and $0 , respectively. As of December 31, 2017 the total unrecognized compensation expense for all RSUs was approximately $3.3 million , and is expected to be recognized over a weighted-average period of approximately 2.5 years . The following table summarizes RSUs activity for the year December 31, 2017 : Number of Weighted Outstanding at January 1, 2017 372,335 $ 3.89 Granted 691,585 $ 13.65 Vested — $ — Exercised — $ — Forfeited (2,841 ) $ 13.25 Expired — $ — Canceled (372,335 ) $ 3.89 Outstanding at December 31, 2017 688,744 $ 13.66 Effective June 5, 2017, our Board of Directors authorized and granted performance stock unit awards to certain key employees under the IAP. The actual number of shares that may be issued under the performance stock unit awards ranges from zero up to a maximum of twice the target number of performance stock unit awards granted to the participant, based on our total shareholder return relative to a designated peer group from the date of our IPO through December 31, 2019. Compensation expense is recorded ratably over the corresponding requisite service period. The fair value of performance stock unit awards is determined using a Monte Carlo probability model. Grant recipients do not have any shareholder rights until performance relative to the peer group has been determined following the completion of the performance period and shares have been issued. For the years ended December 31, 2017 , 2016 and 2015 the recorded stock compensation expense for the performance stock units was $0.4 million , $0 and $0 , respectively. The following table summarizes information about the performance stock units that were outstanding at December 31, 2017 : Period Target Shares Target Target Shares Vested Target Target Shares Weighted 2015 — — — — — — 2016 — — — — — — 2017 — 169,635 — — 169,635 $ 10.73 Total — 169,635 — — 169,635 The total stock compensation expense for the years ended December 31, 2017 , 2016 and 2015 for all stock awards was $9.5 million , $1.6 million and $1.2 million , respectively. The total unrecognized compensation expense as of December 31, 2017 is approximately $6.8 million , and is expected to be recognized over a weighted-average period of approximately 2.6 years .

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The components of the provision for income taxes for the years ended December 31, 2017 , 2016 and 2015 are as follows: ($ in thousands) 2017 2016 2015 Federal: Current $ (376 ) $ — $ (1,092 ) Deferred 3,634 (29,082 ) (22,177 ) 3,258 (29,082 ) (23,269 ) State: Current 74 — (350 ) Deferred (204 ) 1,110 (1,769 ) (130 ) 1,110 (2,119 ) Total expense (benefit) $ 3,128 $ (27,972 ) $ (25,388 ) Reconciliation between the amounts determined by applying the federal statutory rate of 35% to income tax benefit is as follows: ($ in thousands) 2017 2016 2015 Tax at federal statutory rate $ 5,510 $ (28,392 ) $ (24,935 ) State taxes, net of federal benefit 176 (216 ) (885 ) Permanent differences 1,582 498 579 Stock-based compensation (655 ) — — Valuation allowance 273 879 — Effect of change in enacted Tax Act (3,448 ) — — Other (310 ) (741 ) (147 ) Total provision $ 3,128 $ (27,972 ) $ (25,388 ) Deferred tax assets and liabilities are recognized for estimated future tax effects of temporary differences between the tax basis of an asset or liability and its reported amount in the consolidated financial statements. The significant items giving rise to deferred tax assets (liabilities) at December 31, 2017 and 2016 , respectively, are as follows: ($ in thousands) 2017 2016 Deferred Income Tax Assets Accrued liabilities $ 1,264 $ 334 Allowance for doubtful accounts 94 195 Goodwill and other intangible assets 5,304 10,953 Stock‑based compensation 2,960 1,692 Net operating losses 56,788 49,267 Other 69 389 Noncurrent deferred tax assets 66,479 62,830 Total deferred tax assets 66,479 62,830 Valuation allowance (1,151 ) (879 ) Total deferred tax assets — net 65,328 61,951 Deferred Income Tax Liabilities Property and equipment (68,811 ) (60,958 ) Prepaid expenses (965 ) (1,506 ) Other (131 ) (635 ) Noncurrent deferred tax liabilities (69,907 ) (63,099 ) Net deferred tax liability $ (4,579 ) $ (1,148 ) At December 31, 2017 , the Company had approximately $261.0 million of federal net operating loss carryforwards that will begin to expire in 2032 and state net operating losses of approximately $47.0 million that will begin to expire in 2024 . Utilization of net operating loss carryforwards may be limited due to past or future ownership changes. As of December 31, 2017 , we had a net valuation allowance of $1.2 million on the basis of management’s reassessment of the amount of its deferred tax assets that are more likely than not to be realized. The Company’s U.S. federal income tax returns for the years ended December 31, 2014 through December 31, 2016 remain open to examination by the Internal Revenue Service under the applicable U.S. federal statute of limitations provisions. The various states in which the Company is subject to income tax are generally open to examination for the tax years ended after December 31, 2013. On December 22, 2017, the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (“Tax Act”). The Tax Act makes broad and complex changes to the U.S. tax code including, but not limited to (1) reducing the U.S. federal corporate tax rate from 35% to 21%, (2) eliminating the corporate alternative minimum tax (AMT) and changing how existing AMT credits can be realized, (3) creating a new limitation on deductible interest expense, (4) changes to bonus depreciation, and (5) changing rules related to use and limitations of net operating loss carryforwards for tax years beginning after December 31, 2017. The only material items that impacted the Company’s consolidated financial statements in 2017 were bonus depreciation and the corporate rate reduction. While the corporate rate reduction is effective January 1, 2018, we accounted for this anticipated rate change during the year ended December 31, 2017, the year of enactment. Consequently, we recorded a $3.4 million decrease to the net deferred tax liability, with a corresponding net adjustment to deferred tax benefit. In June 2006, the FASB issued FASB Interpretation (FIN) No. 48, Accounting for Uncertainty in Income Taxes — an interpretation of FASB Statement No. 109 (subsequently codified as ASC 740‑10, Income Taxes, Under FASB Statement No. 168, The FASB Accounting Standards Codification and the Hierarchy of Generally Accepted Accounting Principles — a replacement of FASB Statement No. 162 ). ASC 740‑10 prescribes a comprehensive model for recognizing, measuring, presenting, and disclosing in the consolidated financial statements tax positions taken or expected to be taken on a tax return, including a decision to file or not to file in a particular jurisdiction. The Company evaluated all tax positions and determined that the aggregate exposure under ASC 740‑10 did not have a material effect on the consolidated financial statements during the year ended December 31, 2017 , 2016 and 2015 . Therefore, no adjustments have been made to the consolidated financial statements related to the implementation of ASC 740‑10. The Company will continue to evaluate its tax positions in accordance with ASC 740‑10 and will recognize any future effect as a charge to income in the applicable period. Income tax penalties and interest assessments recognized under ASC 740‑10 are accrued as a tax expense in the period that the Company’s taxes are in an uncertain tax position. Any accrued tax penalties or interest assessments will remain until the uncertain tax position is resolved with the taxing authorities or until the applicable statute of limitations has expired.

RELATED_PARTY TRANSACTIONS

RELATED‑PARTY TRANSACTIONS	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
RELATED‑PARTY TRANSACTIONS	RELATED‑PARTY TRANSACTIONS The Company leases its corporate offices from a related party pursuant to a five ‑year lease agreement with a five ‑year extension option requiring a base rent of $0.1 million per year. The Company also leases five properties adjacent to the corporate office from related parties with annual base rents of $0.03 million , $0.03 million , $0.1 million , $0.1 million , and $0.2 million . For the years ended December 31, 2017 , 2016 and 2015 , the Company paid approximately $0.3 million , $0.2 million and $0.2 million , respectively, for the use of transportation services from a related party. The Company also rents equipment in Elk City, Oklahoma from a related party. For the years ended December 31, 2017 , 2016 and 2015 , the Company paid $0.2 million , $0.2 million and $0.2 million , respectively. At December 31, 2017 , 2016 and 2015 , the Company had $0.02 million , $0 and $0 in payables, respectively, and approximately $0 , $0.04 million and $0.02 million in receivables, respectively, for related parties for services provided. All agreements pertaining to realty property and equipment were entered into during periods where the Company had limited liquidity and related parties secured them on behalf of the Company. All related party receivables and payables are immaterial and have not been separately shown on the face of the financial statements. For related party disclosure related to equity transactions with Energy Capital Partners, see Note 18.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Operating Lease — The Company has various operating leases for office space and certain property and equipment. For the years ended December 31, 2017 , 2016 and 2015 , the Company recorded operating lease expense of $1.4 million , $1.4 million and $1.4 million , respectively. Required remaining lease payments for each fiscal year are as follows: ($ in thousands) 2018 $ 594 2019 366 2020 344 2021 344 2022 and thereafter 431 Total $ 2,079 Contingent Liabilities — The Company may be subject to various legal actions, claims, and liabilities arising in the ordinary course of business. In the opinion of management, the ultimate disposition of these matters will not have a materially adverse effect on the Company’s financial position, results of operations, or liquidity.

EQUITY CAPITALIZATION

EQUITY CAPITALIZATION	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
EQUITY CAPITALIZATION	EQUITY CAPITALIZATION Credit Amendment Equity Infusion In connection with the Term Loan and Revolving Credit Facility amendment dated June 8, 2016 (see Note 9), ECP and its related affiliates along with other shareholders infused $40.4 million of equity into the Company and we issued 18,007,328 additional shares of common stock. On November 9, 2017, ECP sold 13,800,000 shares of its common stock holdings in a secondary offering at $15.07 per share. Convertible Preferred Stock On December 27, 2016, we completed a private placement offering of $170.0 million , issuing 16,999,990 shares of Series A nonparticipating convertible preferred stock, par value $0.001 per share. Costs associated with the offering were approximately $7.0 million , resulting in net proceeds to the Company of approximately $163.0 million . As of December 31, 2016, 16,999,990 shares of Series A convertible preferred stock were issued and outstanding, convertible into common stock at the conversion price per the private placement agreement. Upon the consummation of the IPO, the Series A Preferred stock automatically converted into common stock. Initial Public Offering On March 22, 2017, we consummated our IPO in which 25,000,000 shares of our common stock, par value $0.001 per share, were sold at a public offering price of $14.00 per share, with 13,250,000 shares issued and sold by the Company and $11,750,000 shares sold by existing stockholders. We received net proceeds of approximately $170.1 million after deducting $10.9 million of underwriting discounts and commissions, and $4.5 million of other offering expenses. At closing, we used the proceeds (i) to repay $71.8 million in outstanding borrowings under the term loan, (ii) $86.8 million to fund the purchase of additional hydraulic fracturing units and other equipment, and (iii) the remaining for general corporate purposes. In connection with the IPO, all 16,999,990 shares of our outstanding Series A Preferred Stock converted to common stock on a 1 :1 basis. Additionally, on March 28, 2017, one executive and one director net settled a total of 226,194 of their exercisable stock options and received 162,212 shares of common stock. At December 31, 2017 and 2016 , the Company had 83,039,854 and 52,627,652 shares outstanding, respectively.

QUARTERLY FINANCIAL DATA (UNAUD

QUARTERLY FINANCIAL DATA (UNAUDITED)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
QUARTERLY FINANCIAL DATA (UNAUDITED)	QUARTERLY FINANCIAL DATA (UNAUDITED) The following table sets forth our unaudited quarterly results for each of the last four quarters for the years ended December 31, 2017 and 2016 . This unaudited quarterly information has been prepared on the same basis as our annual audited financial statements and includes all adjustments, consisting only of normal recurring adjustments that are necessary to present fairly the financial information for the fiscal quarters presented. 2017 (In thousands, except for per share data) First Quarter Second Quarter Third Quarter Fourth Quarter Service revenue $ 171,931 $ 213,492 $ 282,730 $ 313,712 Gross profit $ 22,366 $ 36,715 $ 57,297 $ 51,664 Net income (loss) $ (24,351 ) $ 4,921 $ 21,965 $ 10,078 Net income (loss) per common share: Basic $ (0.43 ) $ 0.06 $ 0.26 $ 0.12 Diluted $ (0.43 ) $ 0.06 $ 0.25 $ 0.12 Weighted average common shares outstanding: Basic 55,996 83,040 83,040 83,040 Diluted 55,996 86,279 86,264 86,818 2016 (In thousands, except for per share data) First Quarter Second Quarter Third Quarter Fourth Quarter Service revenue $ 87,930 $ 68,165 $ 116,904 $ 163,921 Gross profit $ 7,641 $ 3,316 $ 6,681 $ 15,142 Net loss $ (12,940 ) $ (9,294 ) $ (13,598 ) $ (17,315 ) Net income (loss) per common share: Basic $ (0.37 ) $ (0.24 ) $ (0.26 ) $ (0.33 ) Diluted $ (0.37 ) $ (0.24 ) $ (0.26 ) $ (0.33 ) Weighted average common shares outstanding: Basic 34,993 39,496 52,975 52,628 Diluted 34,993 39,496 52,975 52,628

SIGNIFICANT ACCOUNTING POLICI26

SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation — The accompanying consolidated financial statements include the accounts of Holding and its wholly owned subsidiary, Services. All intercompany accounts and transactions have been eliminated in consolidation.
Basis of Presentation	Basis of Presentation — The accompanying consolidated financial statements and related notes have been prepared pursuant to the rules and regulations of the Securities Exchange Commission (SEC) and in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”).
Use of Estimates	Use of Estimates — Management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and revenues and expenses during the reporting period. Such estimates include, but are not limited to, allowance for doubtful accounts, depreciation of property and equipment, estimates of fair value of property and equipment, estimates related to fair value of reporting units for purposes of assessing goodwill, estimates related to deferred tax assets and liabilities, including any related valuation allowances, and estimates of fair value of stock‑based compensation. Actual results could differ from those estimates.
Revenue Recognition	Revenue Recognition — The Company’s services are sold based upon contracts or other agreements with the customer that include fixed or determinable prices and do not include other post‑delivery obligations. Revenue for services is recognized as the services are rendered and when collectability is reasonably assured. Rates for services are typically determined per the contract or agreement with customers. Pressure Pumping — Pressure pumping consists of downhole pumping services including hydraulic fracturing (inclusive of acidizing services) and cementing. The Company recognizes revenues when services are performed, collection of the receivables is probable, and a price is fixed or determinable. The Company prices services for its pressure pumping by the job, project or day depending on the type of service performed and request from the customer. Drilling Services — Drilling services consists of surface air drilling and drilling, whereby we drill a well for a customer to a certain depth using a drilling rig and related equipment. The Company recognizes revenues either on a “turnkey” contract basis, in which a fixed and set price for the job is determinable, on a “daywork” contract basis, in which a stated rate per day is fixed and determinable, or on a “footage” contract basis, in which a rate per feet drilled is fixed and determinable. Other Completion & Production Services — Other completion & production services consists of coil tubing and flowback services whereby the Company recognizes revenues when services are performed either on a per job or per day or hourly rate, collections of receivables are probable, and a price is fixed or determinable.
Cash and Cash Equivalents	Cash and Cash Equivalents — The Company considers highly liquid investments with initial maturities of three months or less to be cash equivalents.
Accounts Receivable	Accounts Receivable — Accounts receivables are stated at the amount billed and billable to customers. The Company’s allowance for doubtful accounts is based on management’s evaluations of the collectability of each accounts receivable based on the customer’s payment history and general economic conditions.
Inventories	Inventories — Inventories, which consists only of raw materials, are stated at lower of average cost or net realizable value.
Property and Equipment	Property and Equipment — The Company’s property and equipment are recorded at cost, less accumulated depreciation. Upon sale or retirement of property and equipment, the cost and related accumulated depreciation are removed from the balance sheet and the net amount, less proceeds from disposal, is recognized as a gain or loss in the statement of operations.
Depreciation	Depreciation — Depreciation of property and equipment is provided on the straight‑line method over the following estimated useful lives: Vehicles 1 ‑ 5 years Equipment 1 ‑ 20 years Leasehold improvements 5 ‑ 20 years
Impairment of Long-Lived Assets	Impairment of Long‑Lived Assets — In accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 360, Accounting for the Impairment or Disposal of Long‑Lived Assets , the Company reviews its long‑lived assets to be held and used whenever events or circumstances indicate that the carrying value of those assets may not be recoverable. An impairment loss is indicated if the sum of the expected future undiscounted cash flows attributable to the asset group is less than the carrying amount of such asset group. In this circumstance, the Company recognizes an impairment loss for the amount by which the carrying amount of the asset group exceeds the fair value of the asset group. The Company accounts for long‑lived assets to be disposed of at the lower of their carrying amount or fair value, less cost to sell once management has committed to a plan to dispose of the assets.
Goodwill	Goodwill — Goodwill is the excess of the consideration transferred over the fair value of the tangible and identifiable intangible assets and liabilities recognized. Goodwill is not amortized. We perform an annual impairment test of goodwill as of December 31, or more frequently if circumstances indicate that impairment may exist. The determination of impairment is made by comparing the carrying amount of a reporting unit with its fair value, which is generally calculated using a combination of market and income approaches. If the fair value of the reporting unit exceeds the carrying value, no further testing is performed. If the fair value of the reporting unit is less than the carrying value, we consider goodwill to be impaired, and the amount of impairment loss is estimated and recorded in the statement of operations.
Intangible Assets	Intangible Assets — Intangible assets with finite useful lives are amortized on a basis that reflects the pattern in which the economic benefits of the intangible assets are realized, which is generally on a straight‑line basis over the asset’s estimated useful life.
Income Taxes	Income Taxes — Income taxes are accounted for under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the consolidated financial statements. Under this method, deferred tax assets and liabilities are determined on the basis of differences between the consolidated financial statements and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. We recognize deferred tax assets to the extent that we believe these assets are more likely than not to be realized. In making such a determination, we consider all positive and negative evidences, including future reversals of existing taxable temporary differences, projected future taxable income, and the results of recent operations. If we determine that we would be able to realize our deferred tax assets in the future in excess of their net recorded amount, we would make an adjustment to the deferred tax asset valuation allowance, which would reduce the provision for income taxes.
Advertising Expense	Advertising Expense — All advertising costs are expensed as incurred.
Deferred Loan Costs	Deferred Loan Costs — The Company capitalized certain costs in connection with obtaining its borrowings, including lender, legal, and accounting fees. These costs are being amortized over the term of the related loan using the straight‑line method (which approximates the interest method). Deferred loan costs amortization is included in interest expense. Unamortized deferred loan costs associated with loans paid off or refinanced with different lenders are charged off in the period in which such an event occurs. Deferred loan costs are classified as a reduction of long‑term debt or in certain instance as an asset in the consolidated balance sheet. Amortization of deferred loan costs is recorded as interest expense in the statement of operations
Stock Based Compensation	Stock-Based Compensation — The Company recognizes the cost of stock‑based awards on a straight‑line basis over the requisite service period of the award, which is usually the vesting period under the fair value method. Total compensation cost is measured on the grant date using fair value estimates.
Insurance Financing	Insurance Financing — The Company annually renews their commercial insurance policies and records a prepaid insurance asset and amortizes it monthly over the coverage period. The Company may choose to finance a portion of the premiums and will make repayments monthly over ten months in equal installments.
Concentration of Credit Risk	Concentration of Credit Risk — The Company’s assets that are potentially subject to concentrations of credit risk are cash and cash equivalents and trade accounts receivable. Cash balances are maintained in financial institutions, which at times exceed federally insured limits. The Company monitors the financial condition of the financial institutions in which accounts are maintained and has not experienced any losses in such accounts. The receivables of the Company are spread over a number of customers, a majority of which are credible operators and suppliers to the oil and natural gas industries. The Company performs ongoing credit evaluations as to the financial condition of its customers with respect to trade receivables.
Recently Issued Accounting Standards	In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update (ASU) No. 2014-09, Revenue from Contracts with Customers (Topic 606) . ASU No. 2014-09 requires entities to recognize revenue to depict transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU No. 2014-09 requires entities to disclose both qualitative and quantitative information that enables users of the consolidated financial statements to understand the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers, including disclosure of significant judgments affecting the recognition of revenue. ASU No. 2014-09 was originally effective for annual periods beginning after December 15, 2016, using either the retrospective or cumulative effect transition method. On August 12, 2015, the FASB issued ASU No. 2015-14, which defers the effective date of the revenue standard, ASU No. 2014-09, by one year for all entities and permits early adoption on a limited basis. We have completed our evaluation of ASU No. 2014-09, and the adoption of this guidance will not materially affect our revenue recognition. However, there will be additional disclosures on our consolidated financial statements relating to the adoption of this standard. I n July 2015, the FASB issued ASU No. 2015-11, Simplifying the Measurement of Inventory, which requires entities to measure most inventory "at the lower of cost and net realizable value," thereby simplifying the current guidance under which an entity must measure inventory at the lower of cost or market. ASU No. 2015-11 does not apply to inventories that are measured by using either the last-in, first-out method or the retail inventory method. The amendments in ASU No. 2015-11 are effective for fiscal years beginning after December 15, 2016. The ASU became effective for us in 2017 and the adoption of this guidance did not materially affect our consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases , a new standard on accounting for leases. The ASU introduces a lessee model that brings most leases on the balance sheet. The new standard also aligns many of the underlying principles of the new lessor model with those in the current accounting guidance as well as the FASB’s new revenue recognition standard. However, the ASU eliminates the use of bright-line tests in determining lease classification as required in the current guidance. The ASU also requires additional qualitative disclosures along with specific quantitative disclosures to better enable users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The new standard is effective for annual reporting periods beginning after December 15, 2018, including periods within that reporting period, using a modified retrospective approach. Early adoption is permitted. We have not completed an evaluation of the impact the pronouncement will have on our consolidated financial statements and related disclosures. In March 2016, the FASB issued ASU No. 2016-09, Compensation- Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, which modifies several aspects of the accounting for share-based payment transactions including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The new standard is effective for fiscal years and interim periods beginning after December 15, 2016, with early adoption permitted. The ASU became effective for us in 2017 and the adoption of this guidance did not materially affect our consolidated financial statements. In January 2017, the FASB issued ASU No. 2017-04, Simplifying the Test for Goodwill Impairment , which removes the requirement to compare the implied fair value of goodwill with its carrying amount as part of step two of the goodwill impairment test. As a result, under this ASU, an entity would recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. This pronouncement is effective for impairment tests in fiscal years beginning after December 15, 2019, on a prospective basis. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. We believe that the adoption of this guidance will not materially affect our consolidated financial statements.
Fair Value Measurements	FAIR VALUE MEASUREMENTS Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (i.e., the “exit price”) in an orderly transaction between market participants at the measurement date. In determining fair value, the Company uses various valuation approaches and establishes a hierarchy for inputs used in measuring fair value that maximizes the use of relevant observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used, when available. Observable inputs are inputs that market participants would use in pricing the asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the assumptions other market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. The hierarchy is broken down into three levels based on the observability of inputs as follows: Level 1 — Valuations based on quoted prices in active markets for identical assets or liabilities that the Company has the ability to access. Valuation adjustments and block discounts are not applied to Level 1 instruments. Since valuations are based on quoted prices that are readily and regularly available in an active market, valuation of these instruments does not entail a significant degree of judgment. Level 2 — Valuations based on one or more quoted prices in markets that are not active or for which all significant inputs are observable, either directly or indirectly. Level 3 — Valuations based on inputs that are unobservable and significant to the overall fair value measurement. A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.

SIGNIFICANT ACCOUNTING POLICI27

SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Property and equipment	Depreciation of property and equipment is provided on the straight‑line method over the following estimated useful lives: Vehicles 1 ‑ 5 years Equipment 1 ‑ 20 years Leasehold improvements 5 ‑ 20 years Property and equipment consisted of the following at December 31, 2017 and 2016 , respectively: ($ in thousands) 2017 2016 Equipment and vehicles $ 646,800 $ 402,641 Leasehold improvements 4,987 4,500 Subtotal 651,787 407,141 Less accumulated depreciation 180,877 143,279 Property and equipment — net $ 470,910 $ 263,862

SUPPLEMENTAL CASH FLOWS INFOR28

SUPPLEMENTAL CASH FLOWS INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Supplemental cash flow disclosures	December 31, ($ in thousands) 2017 2016 2015 Supplemental cash flows disclosures Interest paid $ 3,966 $ 18,249 $ 20,531 Income taxes paid $ — $ 3 $ 1,295 Supplemental disclosure of non‑cash activities Capital expenditures included in accounts payable $ 33,850 $ 3,176 $ 8,821 Conversion of preferred stock to common stock at Initial Public Offering $ 162,511 $ — $ —

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Assets measured at fair value on a nonrecurring basis	Assets measured at fair value on a nonrecurring basis at December 31, 2017 and 2016 , respectively, are set forth below: Estimated fair value measurements Balance Quoted prices in Significant other Significant other Total gains ($ in thousands): 2017: Property and equipment, net $ — $ — $ — $ — $ — Goodwill $ — $ — $ — $ — $ — 2016: Property and equipment, net $ 8,700 $ — $ 8,700 $ — $ (6,305 ) Goodwill $ 9,425 $ — $ — $ 9,425 $ (1,177 )

INTANGIBLE ASSETS (Tables)

INTANGIBLE ASSETS (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets subject to amortization	At December 31, 2017 and 2016 , respectively, the company’s intangible assets subject to amortization are as follows: ($ in thousands) 2017 2016 Internally developed software $ 1,440 $ 1,440 Less accumulated amortization 1,139 851 Intangible assets — net $ 301 $ 589
Estimated remaining amortization expense	Estimated remaining amortization expense for each of the subsequent fiscal years is expected to be as follows: ($ in thousands) Year Estimated 2018 $ 288 2019 13 Total $ 301

PROPERTY AND EQUIPMENT (Tables)

PROPERTY AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property and equipment	Depreciation of property and equipment is provided on the straight‑line method over the following estimated useful lives: Vehicles 1 ‑ 5 years Equipment 1 ‑ 20 years Leasehold improvements 5 ‑ 20 years Property and equipment consisted of the following at December 31, 2017 and 2016 , respectively: ($ in thousands) 2017 2016 Equipment and vehicles $ 646,800 $ 402,641 Leasehold improvements 4,987 4,500 Subtotal 651,787 407,141 Less accumulated depreciation 180,877 143,279 Property and equipment — net $ 470,910 $ 263,862

LONG_TERM DEBT (Tables)

LONG‑TERM DEBT (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Schedule of debt	Total debt consisted of the following notes at December 31, 2017 and 2016 , respectively: ($ in thousands) 2017 2016 ABL Credit Facility $ 55,000 $ — 6.25% "Term loan" — 146,750 Revolving Credit Facility — 13,500 Equipment financing 17,942 19,193 Total debt 72,942 179,443 Less deferred loan costs, net of amortization — 3,116 Subtotal 72,942 176,327 Less current portion of long-term debt 15,764 16,920 Total long-term debt, net of deferred loan costs $ 57,178 $ 159,407
Annual maturities of debt	Scheduled annual maturities of total debt are as follows at December 31, 2017 : ($ in thousands) 2018 $ 15,764 2019 2,142 2020 36 2021 — 2022 and thereafter 55,000 Total $ 72,942

ACCRUED LIABILITIES (Tables)

ACCRUED LIABILITIES (Tables)	12 Months Ended
	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Accrued liabilities	Accrued liabilities consisted of the following at December 31, 2017 and 2016 , respectively: ($ in thousands) 2017 2016 Accrued insurance $ 2,762 $ 2,900 Accrued payroll and related expenses 10,110 4,729 Other 3,735 5,990 Total $ 16,607 $ 13,619

REPORTABLE SEGMENT INFORMATION

REPORTABLE SEGMENT INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Reconciliation of segment information	A reconciliation from segment level financial information to the consolidated statement of operations is provided in the table below. ($ in thousands) Pressure All Other Total Year ended December 31, 2017 Service revenue $ 945,040 $ 36,825 $ 981,865 Adjusted EBITDA $ 145,122 $ (7,679 ) $ 137,443 Depreciation and amortization $ 51,155 $ 4,473 $ 55,628 Capital expenditures $ 300,406 $ 4,893 $ 305,299 Goodwill $ 9,425 $ — $ 9,425 Total assets $ 688,279 $ 30,753 $ 719,032 Pressure All Other Total Year ended December 31, 2016 Service revenue $ 409,014 $ 27,906 $ 436,920 Adjusted EBITDA $ 15,656 $ (7,840 ) $ 7,816 Depreciation and amortization $ 37,282 $ 6,260 $ 43,542 Property and equipment impairment expense $ — $ 6,305 $ 6,305 Goodwill impairment expense $ — $ 1,177 $ 1,177 Capital expenditures $ 45,473 $ 535 $ 46,008 Goodwill $ 9,425 $ — $ 9,425 Total assets $ 501,906 $ 39,516 $ 541,422 Pressure All Other Total Year ended December 31, 2015 Service revenue $ 510,198 $ 59,420 $ 569,618 Adjusted EBITDA $ 62,540 $ (2,391 ) $ 60,149 Depreciation and amortization $ 38,369 $ 11,765 $ 50,134 Property and equipment impairment expense $ 7,980 $ 28,629 $ 36,609 Capital expenditures $ 69,029 $ 2,647 $ 71,676 Goodwill $ 9,425 $ 1,177 $ 10,602 Total assets $ 398,449 $ 48,005 $ 446,454 Reconciliation of net income (loss) to adjusted EBITDA: ($ in thousands) Pressure All Other Total Year ended December 31, 2017 Net income (loss) $ 50,417 $ (37,804 ) $ 12,613 Depreciation and amortization 51,155 4,473 55,628 Interest expense — 7,347 7,347 Income tax expense — 3,128 3,128 Loss on disposal of assets 38,059 1,027 39,086 Stock‑based compensation — 9,489 9,489 Other expense — 1,025 1,025 Other general and administrative expense (1) — 722 722 Deferred IPO Bonus 5,491 2,914 8,405 Adjusted EBITDA $ 145,122 $ (7,679 ) $ 137,443 Year ended December 31, 2016 Pressure All Other Total Net loss $ (45,316 ) $ (7,831 ) $ (53,147 ) Depreciation and amortization 37,282 6,260 43,542 Interest expense — 20,387 20,387 Income tax benefit — (27,972 ) (27,972 ) Loss on disposal of assets 23,690 (1,161 ) 22,529 Property and equipment impairment expense — 6,305 6,305 Goodwill impairment expense — 1,177 1,177 Gain on extinguishment of debt — (6,975 ) (6,975 ) Stock‑based compensation — 1,649 1,649 Other expense — 321 321 Adjusted EBITDA $ 15,656 $ (7,840 ) $ 7,816 Pressure All Other Total Year ended December 31, 2015 Net loss $ (5,022 ) $ (40,831 ) $ (45,853 ) Depreciation and amortization 38,369 11,765 50,134 Interest expense — 21,641 21,641 Income tax benefit — (25,388 ) (25,388 ) Loss on disposal of assets 21,213 55 21,268 Property and equipment impairment expense 7,980 28,629 36,609 Stock‑based compensation — 1,239 1,239 Other expense — 499 499 Adjusted EBITDA $ 62,540 $ (2,391 ) $ 60,149 (1) Other general and administrative expense relates to legal settlement expense.
Major customers	For the years ended December 31, 2017 , 2016 and 2015 , the Company had revenue from the following significant customers that accounted for the following percentages of the Company’s total revenue: 2017 2016 2015 Customer A 15.0 % 18.0 % 12.5 % Customer B 13.8 % 12.5 % 8.8 % Customer C 12.7 % 8.7 % 14.2 % Customer D 12.6 % 7.0 % 11.1 % Customer E 11.8 % — % — %

NET INCOME (LOSS) PER SHARE (Ta

NET INCOME (LOSS) PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Calculations of net income (loss) per share	The table below shows the calculations for years ended December 31, 2017 , 2016 and 2015 . (In thousands, except for per share data) 2017 2016 2015 Numerator (both basic and diluted) Net income (loss) relevant to common stockholders $ 12,613 $ (53,147 ) $ (45,853 ) Denominator Denominator for basic income (loss) per share 76,371 44,787 34,993 Dilutive effect of stock options 2,903 — — Dilutive effect of performance stock units 59 — — Dilutive effect of non-vested restricted stock units 250 — — Denominator for diluted income (loss) per share 79,583 44,787 34,993 Basic net income (loss) per common share $ 0.17 $ (1.19 ) $ (1.31 ) Diluted net income (loss) per common share $ 0.16 $ (1.19 ) $ (1.31 )
Anti-dilutive shares excluded from diluted earnings (loss) per share calculation	As shown in the table below, the following non-vested restricted stock units, preferred stock, performance stock units, and stock options have not been included in the calculation of diluted income (loss) per share for years ended December 31, 2017 , 2016 and 2015 as they would be anti-dilutive to the calculation above. (Count in thousands) 2017 2016 2015 Stock options — 4,646 3,486 Preferred stock — 17,000 — Performance stock units — — — Non-vested restricted stock units — 372 372 — 22,018 3,858

STOCK_BASED COMPENSATION (Table

STOCK‑BASED COMPENSATION (Tables)	12 Months Ended
	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock options, valuation assumptions	The fair value of the options was estimated at the date of grant using the following assumptions: Expected volatility 45 % Expected dividends $ — Expected term (in years) 6.25 Risk free rate 1.83 % The fair value of each option award granted is estimated on the date of grant using the Black- Scholes option-pricing model. The fair value of the options was estimated at the date of grant using the following assumptions: Expected volatility 55 % Expected dividends $ — Expected term (in years) 5.8 Risk free rate 1.22 % The fair value of the options was estimated at the date of grant using the following assumptions: Expected volatility 45 % Expected dividends $ — Expected term (in years) 6.25 Risk free rate 1.35 % The fair value of each stock option award granted is estimated on the date of grant using the Black- Scholes option-pricing model. The fair value of the options was estimated at the date of grant using the following assumptions: Expected volatility 18 % Expected dividends $ — Expected term (in years) 6.25 Risk free rate 2.23 %
Schedule of stock options, activity	A summary of the stock option activity for the year ended December 31, 2017 is presented below. Number Weighted Outstanding at January 1, 2017 4,645,884 $ 3.49 Granted 793,738 $ 14.00 Exercised (226,194 ) $ 3.96 Forfeited (5,148 ) $ 14.00 Expired — $ — Canceled (571,927 ) $ 3.96 Outstanding at December 31, 2017 4,636,353 $ 5.20 Exercisable at December 31, 2017 3,847,763 $ 3.39
Schedule of RSUs, activity	The following table summarizes RSUs activity for the year December 31, 2017 : Number of Weighted Outstanding at January 1, 2017 372,335 $ 3.89 Granted 691,585 $ 13.65 Vested — $ — Exercised — $ — Forfeited (2,841 ) $ 13.25 Expired — $ — Canceled (372,335 ) $ 3.89 Outstanding at December 31, 2017 688,744 $ 13.66
Schedule of performance shares, activity	The following table summarizes information about the performance stock units that were outstanding at December 31, 2017 : Period Target Shares Target Target Shares Vested Target Target Shares Weighted 2015 — — — — — — 2016 — — — — — — 2017 — 169,635 — — 169,635 $ 10.73 Total — 169,635 — — 169,635

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Schedule of components of income tax expense (benefit)	The components of the provision for income taxes for the years ended December 31, 2017 , 2016 and 2015 are as follows: ($ in thousands) 2017 2016 2015 Federal: Current $ (376 ) $ — $ (1,092 ) Deferred 3,634 (29,082 ) (22,177 ) 3,258 (29,082 ) (23,269 ) State: Current 74 — (350 ) Deferred (204 ) 1,110 (1,769 ) (130 ) 1,110 (2,119 ) Total expense (benefit) $ 3,128 $ (27,972 ) $ (25,388 )
Schedule of effective income tax rate reconciliation	Reconciliation between the amounts determined by applying the federal statutory rate of 35% to income tax benefit is as follows: ($ in thousands) 2017 2016 2015 Tax at federal statutory rate $ 5,510 $ (28,392 ) $ (24,935 ) State taxes, net of federal benefit 176 (216 ) (885 ) Permanent differences 1,582 498 579 Stock-based compensation (655 ) — — Valuation allowance 273 879 — Effect of change in enacted Tax Act (3,448 ) — — Other (310 ) (741 ) (147 ) Total provision $ 3,128 $ (27,972 ) $ (25,388 )
Schedule of deferred tax assets and liabilities	The significant items giving rise to deferred tax assets (liabilities) at December 31, 2017 and 2016 , respectively, are as follows: ($ in thousands) 2017 2016 Deferred Income Tax Assets Accrued liabilities $ 1,264 $ 334 Allowance for doubtful accounts 94 195 Goodwill and other intangible assets 5,304 10,953 Stock‑based compensation 2,960 1,692 Net operating losses 56,788 49,267 Other 69 389 Noncurrent deferred tax assets 66,479 62,830 Total deferred tax assets 66,479 62,830 Valuation allowance (1,151 ) (879 ) Total deferred tax assets — net 65,328 61,951 Deferred Income Tax Liabilities Property and equipment (68,811 ) (60,958 ) Prepaid expenses (965 ) (1,506 ) Other (131 ) (635 ) Noncurrent deferred tax liabilities (69,907 ) (63,099 ) Net deferred tax liability $ (4,579 ) $ (1,148 )

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule of future minimum rental payments for operating leases	Required remaining lease payments for each fiscal year are as follows: ($ in thousands) 2018 $ 594 2019 366 2020 344 2021 344 2022 and thereafter 431 Total $ 2,079

QUARTERLY FINANCIAL DATA (UNA39

QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data	The following table sets forth our unaudited quarterly results for each of the last four quarters for the years ended December 31, 2017 and 2016 . This unaudited quarterly information has been prepared on the same basis as our annual audited financial statements and includes all adjustments, consisting only of normal recurring adjustments that are necessary to present fairly the financial information for the fiscal quarters presented. 2017 (In thousands, except for per share data) First Quarter Second Quarter Third Quarter Fourth Quarter Service revenue $ 171,931 $ 213,492 $ 282,730 $ 313,712 Gross profit $ 22,366 $ 36,715 $ 57,297 $ 51,664 Net income (loss) $ (24,351 ) $ 4,921 $ 21,965 $ 10,078 Net income (loss) per common share: Basic $ (0.43 ) $ 0.06 $ 0.26 $ 0.12 Diluted $ (0.43 ) $ 0.06 $ 0.25 $ 0.12 Weighted average common shares outstanding: Basic 55,996 83,040 83,040 83,040 Diluted 55,996 86,279 86,264 86,818 2016 (In thousands, except for per share data) First Quarter Second Quarter Third Quarter Fourth Quarter Service revenue $ 87,930 $ 68,165 $ 116,904 $ 163,921 Gross profit $ 7,641 $ 3,316 $ 6,681 $ 15,142 Net loss $ (12,940 ) $ (9,294 ) $ (13,598 ) $ (17,315 ) Net income (loss) per common share: Basic $ (0.37 ) $ (0.24 ) $ (0.26 ) $ (0.33 ) Diluted $ (0.37 ) $ (0.24 ) $ (0.26 ) $ (0.33 ) Weighted average common shares outstanding: Basic 34,993 39,496 52,975 52,628 Diluted 34,993 39,496 52,975 52,628

ORGANIZATION AND HISTORY (Detai

ORGANIZATION AND HISTORY (Details) $ / shares in Units, $ in Thousands	Mar. 22, 2017USD ($)$ / sharesshares	Dec. 22, 2016shares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)$ / sharesshares	Dec. 31, 2015USD ($)	Sep. 30, 2013$ / shares
Class of Stock [Line Items]
Stock split ratio		0.0059
Stock, shares authorized (in shares)		230,000,000
Common stock, authorized (in shares)		200,000,000	200,000,000	200,000,000
Preferred stock, authorized (in shares)		30,000,000	30,000,000	30,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.001	$ 0.001		$ 0.001
Proceeds from IPO | $			$ 185,500	$ 0	$ 0
Repayment of outstanding borrowings | $	$ 71,800		166,546	41,295	73,782
Funds to purchase additional hydraulic fracturing fleets and other equipment | $	$ 86,800		$ 285,891	$ 42,832	$ 62,855
IPO
Class of Stock [Line Items]
Shares of common stock sold, including shares sold by third parties (in shares)	25,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.001
Stock price (in dollars per share) | $ / shares	$ 14
Proceeds from IPO | $	$ 170,100
Payment of underwriting discounts and commissions | $	10,900
Payments of stock issuance costs, other | $	$ 4,500
IPO | Series A Preferred Stock
Class of Stock [Line Items]
Number of shares of outstanding stock converted (in shares)	16,999,990
IPO | March 2017 Stock Split
Class of Stock [Line Items]
Stock split ratio	1.45
IPO | Series A Preferred Stock Converted To Common Stock | Series A Preferred Stock
Class of Stock [Line Items]
Stock split ratio	1
IPO sold by Company
Class of Stock [Line Items]
Shares of common stock sold, including shares sold by third parties (in shares)	13,250,000
IPO sold by existing stockholders
Class of Stock [Line Items]
Shares of common stock sold, including shares sold by third parties (in shares)	11,750,000

SIGNIFICANT ACCOUNTING POLICI41

SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2011
Accounting Policies [Abstract]
Allowance for doubtful accounts	$ 400,000	$ 600,000	$ 800,000
Loss on disposal of assets	39,086,000	22,529,000	21,268,000
Property, Plant and Equipment [Line Items]
Property and equipment impairment expense	0	6,305,000	36,609,000
Goodwill	9,425,000	9,425,000	10,602,000
Goodwill impairment expense	0	1,177,000	0
Advertising expense	800,000	400,000	900,000
Amortization of deferred debt issuance costs	3,403,000	2,091,000	1,351,000
Blackrock Drilling, Inc
Property, Plant and Equipment [Line Items]
Consideration transferred				$ 1,800,000
Property, plant, and equipment				600,000
Goodwill				$ 1,200,000
Goodwill impairment expense		1,200,000	0
Technology Stimulation Services, LLC
Property, Plant and Equipment [Line Items]
Consideration transferred					$ 24,400,000
Property, plant, and equipment					15,000,000
Goodwill					$ 9,400,000
Goodwill impairment expense	0	0	0
All Other
Accounting Policies [Abstract]
Loss on disposal of assets	1,027,000	(1,161,000)	55,000
Property, Plant and Equipment [Line Items]
Property and equipment impairment expense		6,305,000	28,629,000
Goodwill	0	0	1,177,000
Goodwill impairment expense		1,177,000
All Other | Blackrock Drilling, Inc
Property, Plant and Equipment [Line Items]
Goodwill impairment expense		1,200,000
Pressure Pumping
Accounting Policies [Abstract]
Loss on disposal of assets	38,059,000	23,690,000	21,213,000
Property, Plant and Equipment [Line Items]
Property and equipment impairment expense		0	7,980,000
Goodwill	9,425,000	9,425,000	$ 9,425,000
Goodwill impairment expense		$ 0
Pressure Pumping | Technology Stimulation Services, LLC
Property, Plant and Equipment [Line Items]
Goodwill	$ 9,400,000
Minimum | Vehicles
Property, Plant and Equipment [Line Items]
Estimated useful lives	P1Y
Minimum | Equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives	P1Y
Minimum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful lives	P5Y
Maximum | Vehicles
Property, Plant and Equipment [Line Items]
Estimated useful lives	P5Y
Maximum | Equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives	P20Y
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful lives	P20Y

SUPPLEMENTAL CASH FLOWS INFOR42

SUPPLEMENTAL CASH FLOWS INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Supplemental cash flows disclosures
Interest paid	$ 3,966	$ 18,249	$ 20,531
Income taxes paid	0	3	1,295
Supplemental disclosure of non‑cash activities
Capital expenditures included in accounts payable	33,850	3,176	8,821
Conversion of preferred stock to common stock at Initial Public Offering	$ 162,511	$ 0	$ 0

FAIR VALUE MEASUREMENTS - Addit

FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment impairment expense	$ 0	$ 6,305,000	$ 36,609,000
Net carrying value of property and equipment	470,910,000	263,862,000
Additions or disposals of goodwill	0	0	0
Goodwill impairment expense	0	1,177,000	0
Goodwill	9,425,000	9,425,000	10,602,000
Drilling
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment impairment expense		6,300,000	28,600,000
Net carrying value of property and equipment		15,000,000	48,100,000
Acidizing unit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment impairment expense			8,000,000
Net carrying value of property and equipment			15,600,000
Surface drilling reporting unit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill		1,200,000
Nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment impairment expense	0	6,305,000
Goodwill impairment expense	0	1,177,000
Nonrecurring basis | Balance
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Implied fair value of goodwill	0	9,425,000
Nonrecurring basis | Surface drilling reporting unit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill impairment expense		1,200,000	0
Fair value of the reporting unit		3,800,000
Nonrecurring basis | Surface drilling reporting unit | Balance
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of reporting unit		4,200,000
Nonrecurring basis | Surface drilling reporting unit | Estimated fair value measurements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Implied fair value of goodwill		0
Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) interest rate swap	300,000	200,000	(300,000)
Interest rate swap | Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of interest rate swap liability	$ 0	$ 300,000	$ 500,000

FAIR VALUE MEASUREMENTS - Asset

FAIR VALUE MEASUREMENTS - Assets Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gains (losses)	$ 0	$ (6,305,000)	$ (36,609,000)
Total gains (losses)	0	(1,177,000)	$ 0
Nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gains (losses)	0	(6,305,000)
Total gains (losses)	0	(1,177,000)
Balance | Nonrecurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment, net	0	8,700,000
Goodwill	0	9,425,000
Estimated fair value measurements | Nonrecurring basis | Quoted prices in active market (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment, net	0	0
Goodwill	0	0
Estimated fair value measurements | Nonrecurring basis | Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment, net	0	8,700,000
Goodwill	0	0
Estimated fair value measurements | Nonrecurring basis | Significant other unobservable inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment, net	0	0
Goodwill	$ 0	$ 9,425,000

INTANGIBLE ASSETS - Additional

INTANGIBLE ASSETS - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Useful life	5 years
Amortization expense	$ 0.3	$ 0.3	$ 0.3
Remaining amortization period	1 year 18 days

INTANGIBLE ASSETS - Intangible

INTANGIBLE ASSETS - Intangible Assets Subject to Amortization (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Internally developed software	$ 1,440	$ 1,440
Less accumulated amortization	1,139	851
Intangible assets — net	$ 301	$ 589

INTANGIBLE ASSETS - Estimated R

INTANGIBLE ASSETS - Estimated Remaining Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
2,018	$ 288
2,019	13
Intangible assets — net	$ 301	$ 589

PROPERTY AND EQUIPMENT (Details

PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Subtotal	$ 651,787	$ 407,141
Less accumulated depreciation	180,877	143,279
Property and equipment — net	470,910	263,862
Equipment and vehicles
Property, Plant and Equipment [Line Items]
Subtotal	646,800	402,641
Leasehold improvements
Property, Plant and Equipment [Line Items]
Subtotal	$ 4,987	$ 4,500

IMPAIRMENT OF LONG_LIVED ASSE49

IMPAIRMENT OF LONG‑LIVED ASSETS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Property and equipment impairment expense	$ 0	$ 6,305,000	$ 36,609,000
Net carrying value of property and equipment	$ 470,910,000	263,862,000
Drilling
Segment Reporting Information [Line Items]
Property and equipment impairment expense		6,300,000	28,600,000
Net carrying value of property and equipment		15,000,000
Fair value of the reporting unit			18,800,000
Acidizing unit
Segment Reporting Information [Line Items]
Property and equipment impairment expense			8,000,000
Fair value of the reporting unit			$ 6,300,000
Estimated fair value measurements | Significant other observable inputs (Level 2) | Drilling
Segment Reporting Information [Line Items]
Property and equipment, net		$ 8,700,000

DEFERRED REVENUE REBATE (Detail

DEFERRED REVENUE REBATE (Details) - USD ($)	1 Months Ended	12 Months Ended
	Nov. 30, 2011	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Fracturing services, period	78 months
Estimated fair value of equipment	$ 13,000,000	$ 305,299,000	$ 46,008,000	$ 71,676,000
Deferred revenue	$ 12,000,000
Amortization as a reduction of revenue		$ 1,846,000	$ 1,846,000	$ 1,846,000
Equipment financing | Note payable
Debt Instrument [Line Items]
Stated interest rate	12.00%
Debt instrument, face amount	$ 25,000,000

LONG_TERM DEBT - Additional Inf

LONG‑TERM DEBT - Additional Information (Details)	Mar. 22, 2017USD ($)	Jan. 13, 2017USD ($)	Jun. 16, 2016USD ($)	Jun. 08, 2016USD ($)	Nov. 24, 2015USD ($)fleet	Sep. 30, 2013USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Feb. 22, 2018USD ($)
Debt Instrument [Line Items]
Proceeds from additional common equity capitalization							$ 0	$ 40,425,000	$ 0
Debt instrument, covenant, additional capital, reserved for working capital				$ 10,000,000
Debt instrument, covenant, additional capital, available for repurchase of debt				$ 30,000,000
Debt instrument, covenant, financial statements, past due, period				30 days
Debt instrument, repurchase price to par			$ 0.80
Debt instrument, repurchase price, discount to par, percentage			20.00%
Extinguishment of debt			$ 37,500,000
Early repayment of senior debt			30,000,000				0	30,000,000	0
Payments of debt extinguishment costs			500,000				0	525,000	0
Gain on extinguishment of debt			$ 7,000,000				0	6,975,000	0
Repayments of borrowings	$ 71,800,000						166,546,000	41,295,000	$ 73,782,000
Debt instrument, term					36 months
Number of hydraulic fracturing fleets | fleet					3
Proceeds from debt					$ 25,000,000
Proceeds from lines of credit							$ 72,942,000	$ 176,327,000
Maximum
Debt Instrument [Line Items]
Debt instrument, covenant, leverage ratio, maximum						3.5
6.25% Term loan | 6.25% Term loan
Debt Instrument [Line Items]
Debt instrument, face amount						$ 220,000,000
Debt instrument, interest rate, stated percentage							6.25%
Repayment of prior debt outstanding, percentage						100.00%
Repayments of debt		$ 75,000,000
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						$ 40,000,000
Debt instrument, interest rate, stated percentage						6.25%
Debt instrument, variable floor rate						1.00%
Repayments of borrowings		$ 13,500,000
Equipment financing | Equipment financing
Debt Instrument [Line Items]
Proceeds from lines of credit							$ 4,700,000
ABL Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 150,000,000
Line of credit facility, expiration period	5 years
Line of credit facility, borrowing base, accounts receivable percentage	85.00%
Line of credit, springing fixed charge coverage ratio	1
Line of credit facility, coverage ratio establishing threshold, option one, percentage of facility size and borrowing base	10.00%
Line of credit facility, coverage ratio establishing threshold, option two, amount	$ 12,000,000
Line of credit facility, commitment fee, utilization percentage, threshold	50.00%
ABL Credit Facility | Line of Credit | Minimum
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage	0.25%
ABL Credit Facility | Line of Credit | Maximum
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage	0.38%
ABL Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.75%
ABL Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.25%
ABL Credit Facility | Line of Credit | Base Rate | Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.75%
ABL Credit Facility | Line of Credit | Base Rate | Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.25%
Term Loan | Equipment financing
Debt Instrument [Line Items]
Fair value percentage of carrying value								89.00%
Investor
Debt Instrument [Line Items]
Proceeds from additional common equity capitalization				$ 400,000
Energy Capital Partners | Majority Shareholder
Debt Instrument [Line Items]
Proceeds from additional common equity capitalization				$ 40,000,000
Estimated fair value measurements | Term Loan | Equipment financing
Debt Instrument [Line Items]
Debt instrument, fair value disclosure								$ 130,600,000
Balance | Term Loan | Equipment financing
Debt Instrument [Line Items]
Debt instrument, fair value disclosure								$ 146,800,000
Subsequent Event | ABL Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity										$ 200,000,000

LONG_TERM DEBT - Schedule of De

LONG‑TERM DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total debt	$ 72,942	$ 179,443
Less deferred loan costs, net of amortization	0	3,116
Subtotal	72,942	176,327
Less current portion of long-term debt	15,764	16,920
Total long-term debt, net of deferred loan costs	57,178	159,407
Line of Credit
Debt Instrument [Line Items]
Total debt	0	13,500
Line of Credit | ABL Credit Facility
Debt Instrument [Line Items]
Total debt	55,000	0
6.25% Term loan | 6.25% Term loan
Debt Instrument [Line Items]
Total debt	$ 0	146,750
Debt instrument, interest rate, stated percentage	6.25%
Equipment financing | Equipment financing
Debt Instrument [Line Items]
Total debt	$ 17,942	$ 19,193
Subtotal	$ 4,700

LONG_TERM DEBT - Maturities of

LONG‑TERM DEBT - Maturities of Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
2,018	$ 15,764
2,019	2,142
2,020	36
2,021	0
2022 and thereafter	55,000
Total	$ 72,942	$ 179,443

ACCRUED LIABILITIES (Details)

ACCRUED LIABILITIES (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Accrued insurance	$ 2,762	$ 2,900
Accrued payroll and related expenses	10,110	4,729
Other	3,735	5,990
Total	$ 16,607	$ 13,619

EMPLOYEE BENEFIT PLAN (Details)

EMPLOYEE BENEFIT PLAN (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Retirement Benefits [Abstract]
Employee minimum service period	6 months
Employee maximum annual contribution	$ 15,000
Annual vesting percentage of company contributions	25.00%
Vesting term	5 years
Employer match percentage of employee contribution	20.00%
Maximum annual match, percentage of gross salary	10.00%
Plan expense	$ 200,000	$ 200,000	$ 200,000

REPORTABLE SEGMENT INFORMATIO56

REPORTABLE SEGMENT INFORMATION - Additional Information (Details) - segment	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting [Abstract]
Number of operating segments	6	7
Number of reportable segments	1

REPORTABLE SEGMENT INFORMATIO57

REPORTABLE SEGMENT INFORMATION - Reconciliation of Segment Information (Details) - USD ($)	1 Months Ended	3 Months Ended								12 Months Ended
	Nov. 30, 2011	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Service revenue		$ 313,712,000	$ 282,730,000	$ 213,492,000	$ 171,931,000	$ 163,921,000	$ 116,904,000	$ 68,165,000	$ 87,930,000	$ 981,865,000	$ 436,920,000	$ 569,618,000
Adjusted EBITDA										137,443,000	7,816,000	60,149,000
Depreciation and amortization										55,628,000	43,542,000	50,134,000
Property and equipment impairment expense										0	6,305,000	36,609,000
Goodwill impairment expense										0	1,177,000	0
Capital expenditures	$ 13,000,000									305,299,000	46,008,000	71,676,000
Goodwill		9,425,000				9,425,000				9,425,000	9,425,000	10,602,000
Total assets		719,032,000				541,422,000				719,032,000	541,422,000	446,454,000
Pressure Pumping
Segment Reporting Information [Line Items]
Service revenue										945,040,000	409,014,000	510,198,000
Adjusted EBITDA										145,122,000	15,656,000	62,540,000
Depreciation and amortization										51,155,000	37,282,000	38,369,000
Property and equipment impairment expense											0	7,980,000
Goodwill impairment expense											0
Capital expenditures										300,406,000	45,473,000	69,029,000
Goodwill		9,425,000				9,425,000				9,425,000	9,425,000	9,425,000
Total assets		688,279,000				501,906,000				688,279,000	501,906,000	398,449,000
All Other
Segment Reporting Information [Line Items]
Service revenue										36,825,000	27,906,000	59,420,000
Adjusted EBITDA										(7,679,000)	(7,840,000)	(2,391,000)
Depreciation and amortization										4,473,000	6,260,000	11,765,000
Property and equipment impairment expense											6,305,000	28,629,000
Goodwill impairment expense											1,177,000
Capital expenditures										4,893,000	535,000	2,647,000
Goodwill		0				0				0	0	1,177,000
Total assets		$ 30,753,000				$ 39,516,000				$ 30,753,000	$ 39,516,000	$ 48,005,000

REPORTABLE SEGMENT INFORMATIO58

REPORTABLE SEGMENT INFORMATION - Reconciliation of Net Income (Loss) to Adjusted EBITDA (Details) - USD ($)	Jun. 16, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net income (loss)		$ 12,613,000	$ (53,147,000)	$ (45,853,000)
Depreciation and amortization		55,628,000	43,542,000	50,134,000
Interest expense		7,347,000	20,387,000	21,641,000
Income tax expense (benefit)		3,128,000	(27,972,000)	(25,388,000)
Loss on disposal of assets		39,086,000	22,529,000	21,268,000
Property and equipment impairment expense		0	6,305,000	36,609,000
Goodwill impairment expense		0	1,177,000	0
Gain on extinguishment of debt	$ (7,000,000)	0	(6,975,000)	0
Stock-based compensation		9,489,000	1,649,000	1,239,000
Other expense		1,025,000	321,000	499,000
Other general and administrative expense		722,000
Deferred IPO bonus expense		8,405,000
Adjusted EBITDA		137,443,000	7,816,000	60,149,000
Pressure Pumping
Segment Reporting Information [Line Items]
Net income (loss)		50,417,000	(45,316,000)	(5,022,000)
Depreciation and amortization		51,155,000	37,282,000	38,369,000
Interest expense		0	0	0
Income tax expense (benefit)		0	0	0
Loss on disposal of assets		38,059,000	23,690,000	21,213,000
Property and equipment impairment expense			0	7,980,000
Goodwill impairment expense			0
Gain on extinguishment of debt			0
Stock-based compensation		0	0	0
Other expense		0	0	0
Other general and administrative expense		0
Deferred IPO bonus expense		5,491,000
Adjusted EBITDA		145,122,000	15,656,000	62,540,000
All Other
Segment Reporting Information [Line Items]
Net income (loss)		(37,804,000)	(7,831,000)	(40,831,000)
Depreciation and amortization		4,473,000	6,260,000	11,765,000
Interest expense		7,347,000	20,387,000	21,641,000
Income tax expense (benefit)		3,128,000	(27,972,000)	(25,388,000)
Loss on disposal of assets		1,027,000	(1,161,000)	55,000
Property and equipment impairment expense			6,305,000	28,629,000
Goodwill impairment expense			1,177,000
Gain on extinguishment of debt			(6,975,000)
Stock-based compensation		9,489,000	1,649,000	1,239,000
Other expense		1,025,000	321,000	499,000
Other general and administrative expense		722,000
Deferred IPO bonus expense		2,914,000
Adjusted EBITDA		$ (7,679,000)	$ (7,840,000)	$ (2,391,000)

REPORTABLE SEGMENT INFORMATIO59

REPORTABLE SEGMENT INFORMATION - Major Customers (Details) - Total revenue	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Customer Concentration Risk | Customer A
Revenue, Major Customer [Line Items]
Concentration risk percentage	15.00%	18.00%	12.50%
Customer Concentration Risk | Customer B
Revenue, Major Customer [Line Items]
Concentration risk percentage	13.80%	12.50%	8.80%
Customer Concentration Risk | Customer C
Revenue, Major Customer [Line Items]
Concentration risk percentage	12.70%	8.70%	14.20%
Customer Concentration Risk | Customer D
Revenue, Major Customer [Line Items]
Concentration risk percentage	12.60%	7.00%	11.10%
Customer Concentration Risk | Customer E
Revenue, Major Customer [Line Items]
Concentration risk percentage	11.80%	0.00%	0.00%
Pressure Pumping Revenue | Product Concentration Risk | Customer A
Revenue, Major Customer [Line Items]
Concentration risk percentage	99.90%	96.00%	99.00%
Pressure Pumping Revenue | Product Concentration Risk | Customer B
Revenue, Major Customer [Line Items]
Concentration risk percentage	99.20%	99.00%	100.00%
Pressure Pumping Revenue | Product Concentration Risk | Customer C
Revenue, Major Customer [Line Items]
Concentration risk percentage	99.90%	100.00%	88.00%
Pressure Pumping Revenue | Product Concentration Risk | Customer D
Revenue, Major Customer [Line Items]
Concentration risk percentage	99.80%	99.00%	99.00%
Pressure Pumping Revenue | Product Concentration Risk | Customer E
Revenue, Major Customer [Line Items]
Concentration risk percentage	95.50%

NET INCOME (LOSS) PER SHARE - C

NET INCOME (LOSS) PER SHARE - Calculation of Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator (both basic and diluted)
Net income (loss) relevant to common stockholders									$ 12,613	$ (53,147)	$ (45,853)
Denominator
Denominator for basic income (loss) per share (in shares)	83,040	83,040	83,040	55,996	52,628	52,975	39,496	34,993	76,371	44,787	34,993
Denominator for diluted income (loss) per share (in shares)	86,818	86,264	86,279	55,996	52,628	52,975	39,496	34,993	79,583	44,787	34,993
Basic net income (loss) per common share (in dollars per share)	$ 0.12	$ 0.26	$ 0.06	$ (0.43)	$ (0.33)	$ (0.26)	$ (0.24)	$ (0.37)	$ 0.17	$ (1.19)	$ (1.31)
Diluted net income (loss) per common share (in dollars per share)	$ 0.12	$ 0.25	$ 0.06	$ (0.43)	$ (0.33)	$ (0.26)	$ (0.24)	$ (0.37)	$ 0.16	$ (1.19)	$ (1.31)
Stock options
Denominator
Dilutive effect of stock options/units (in shares)									2,903	0	0
Performance stock units
Denominator
Dilutive effect of stock options/units (in shares)									59	0	0
Restricted stock units
Denominator
Dilutive effect of stock options/units (in shares)									250	0	0

NET INCOME (LOSS) PER SHARE - A

NET INCOME (LOSS) PER SHARE - Anti-dilutive Shares Excluded from Calculation (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	0	22,018	3,858
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	0	4,646	3,486
Preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	0	17,000	0
Performance stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	0	0	0
Non-vested restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	0	372	372

STOCK_BASED COMPENSATION - Addi

STOCK‑BASED COMPENSATION - Additional Information (Details)

Jun. 05, 2017shares

Mar. 22, 2017shares

Mar. 16, 2017USD ($)installmentshares

Jul. 19, 2016shares

Dec. 31, 2014

Dec. 01, 2013installmentshares

Sep. 30, 2013$ / sharesshares

Jun. 14, 2013shares

Dec. 31, 2017USD ($)$ / sharesshares

Dec. 31, 2016USD ($)installment$ / shares

Dec. 31, 2015USD ($)$ / shares

Dec. 31, 2014$ / sharesshares

Mar. 31, 2017shares

Mar. 04, 2014shares

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Options granted (in shares)

793,738

Outstanding value of options (in dollars per share) | $ / shares

$ 14

Forfeited (in shares)

5,148

Deferred IPO bonus expense | $

$ 8,405,000

Granted (in dollars per share) | $ / shares

$ 3.35

$ 1.77

$ 0

Options, outstanding, intrinsic value | $

$ 69,400,000

Options, exercisable, intrinsic value | $

64,500,000

Options, exercises in period, intrinsic value | $

$ 2,300,000

Options, outstanding, weighted average remaining contractual term

6 years 10 months 18 days

Options, exercisable, weighted average remaining contractual term

6 years 4 months 24 days

Common stock, par value (in dollars per share) | $ / shares

$ 0.001

$ 0.001

$ 0.001

Non-vested restricted stock units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Granted (in dollars per share) | $ / shares

$ 3.89

Target Shares Granted (in shares)

372,335

372,335

691,585

Restricted stock units, conversion of stock, conversion rights (in shares)

1

Performance stock units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Target Shares Granted (in shares)

169,635

Stock Option Plan

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of shares authorized (in shares)

4,645,884

Stock Option Plan | Stock options

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Options granted (in shares)

3,499,228

Outstanding value of options (in dollars per share) | $ / shares

$ 3.96

Expiration period

10 years

Incentive Award Plan

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Number of shares authorized (in shares)

5,800,000

Compensation cost not yet recognized, period for recognition

2 years 7 months 17 days

Tax benefit from compensation expense | $

$ 9,500,000

$ 1,600,000

$ 1,200,000

Compensation not yet recognized, stock options | $

6,800,000

Incentive Award Plan | Non-vested restricted stock units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation | $

6,200,000

0

0

Target Shares Granted (in shares)

319,250

Restricted stock units, conversion of stock, conversion rights (in shares)

1

Compensation not yet recognized, other than options | $

$ 3,300,000

Compensation cost not yet recognized, period for recognition

2 years 6 months

Incentive Award Plan | Performance stock units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Stock-based compensation | $

$ 400,000

0

0

June 14, 2013 | Stock Option Plan | Stock options

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Options granted (in shares)

2,799,408

Expiration period

10 years

Award vesting rights

25.00%

Stock-based compensation | $

$ 700,000

1,200,000

1,200,000

December 1, 2013 | Stock Option Plan | Stock options

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Options granted (in shares)

699,820

Expiration period

10 years

Forfeited (in shares)

114,456

Deferred IPO bonus expense | $

$ 5,100,000

Number of installments | installment

4

July 19, 2016 | Stock Option Plan | Stock options

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Options granted (in shares)

1,274,549

Expiration period

10 years

Stock-based compensation | $

$ 1,800,000

$ 400,000

0

Number of installments | installment

5

March 16, 2017 | Stock Option Plan | Stock options

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Options granted (in shares)

793,738

Expiration period

10 years

Stock-based compensation | $

$ 500,000

$ 0

$ 0

Number of installments | installment

4

STOCK_BASED COMPENSATION - Fair

STOCK‑BASED COMPENSATION - Fair Value Of Options (Details) - Stock Option Plan - Stock options - USD ($)	Mar. 16, 2017	Jul. 19, 2016	Dec. 01, 2013	Jun. 14, 2013
June 14, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility				45.00%
Expected dividends				$ 0
Expected term (in years)				6 years 3 months
Risk free rate				1.35%
December 1, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility			45.00%
Expected dividends			$ 0
Expected term (in years)			6 years 3 months
Risk free rate			1.83%
July 19, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility		55.00%
Expected dividends		$ 0
Expected term (in years)		5 years 9 months
Risk free rate		1.22%
March 16, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	18.00%
Expected dividends	$ 0
Expected term (in years)	6 years 3 months
Risk free rate	2.23%

STOCK_BASED COMPENSATION - Summ

STOCK‑BASED COMPENSATION - Summary Of Stock Option Activity (Details) - $ / shares	Mar. 28, 2017	Dec. 31, 2017
Number of Shares
Outstanding beginning balance (in shares)		4,645,884
Granted (in shares)		793,738
Exercised (in shares)	(162,212)	(226,194)
Forfeited (in shares)		(5,148)
Expired (in shares)		0
Canceled (in shares)		(571,927)
Outstanding ending balance (in shares)		4,636,353
Exercisable ending balance (in shares)		3,847,763
Weighted Average Exercise Price
Outstanding beginning balance (in dollars per share)		$ 3.49
Granted (in dollars per share)		14
Exercised (in dollars per share)		3.96
Forfeited (in dollars per share)		14
Expired (in dollars per share)		0
Canceled (in dollars per share)		3.96
Outstanding ending balance (in dollars per share)		5.20
Exercisable ending balance (in dollars per share)		$ 3.39

STOCK_BASED COMPENSATION - Su65

STOCK‑BASED COMPENSATION - Summary Of RSU Activity (Details) - Non-vested restricted stock units - $ / shares	Mar. 22, 2017	Sep. 30, 2013	Dec. 31, 2017
Number of Shares
Outstanding at Beginning of Period (in shares)			372,335
Granted (in shares)	372,335	372,335	691,585
Vested (in shares)			0
Exercised (in shares)			0
Forfeited (in shares)			(2,841)
Expired (in shares)			0
Canceled (in shares)			(372,335)
Outstanding at End of Period (in shares)			688,744
Weighted Average Grant Date Fair Value
Outstanding at Beginning of Period (in dollars per share)			$ 3.89
Granted (in dollars per share)			13.65
Vested (in dollars per share)			0
Exercised (in dollars per share)			0
Forfeited (in dollars per share)			13.25
Expired (in dollars per share)			0
Canceled (in dollars per share)			3.89
Outstanding at End of Period (in dollars per share)			$ 13.66

STOCK_BASED COMPENSATION - Su66

STOCK‑BASED COMPENSATION - Summary Of Performance Shares Activity (Details) - Performance stock units	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding at Beginning of Period (in shares)	0
Target Shares Granted (in shares)	169,635
Target Shares Vested (in shares)	0
Target Shares Forfeited (in shares)	0
Outstanding at End of Period (in shares)	169,635
2,015
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding at Beginning of Period (in shares)	0
Target Shares Granted (in shares)	0
Target Shares Vested (in shares)	0
Target Shares Forfeited (in shares)	0
Outstanding at End of Period (in shares)	0
Weighted Average Grant Date Fair Value per Share (in dollars per share) | $ / shares	$ 0
2,016
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding at Beginning of Period (in shares)	0
Target Shares Granted (in shares)	0
Target Shares Vested (in shares)	0
Target Shares Forfeited (in shares)	0
Outstanding at End of Period (in shares)	0
Weighted Average Grant Date Fair Value per Share (in dollars per share) | $ / shares	$ 0
2,017
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding at Beginning of Period (in shares)	0
Target Shares Granted (in shares)	169,635
Target Shares Vested (in shares)	0
Target Shares Forfeited (in shares)	0
Outstanding at End of Period (in shares)	169,635
Weighted Average Grant Date Fair Value per Share (in dollars per share) | $ / shares	$ 10.73

INCOME TAXES - Additional Infor

INCOME TAXES - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Operating Loss Carryforwards [Line Items]
Federal statutory income tax rate	35.00%
Valuation allowance	$ 1.2
Change in tax rate provisional income tax expense benefit	3.4
Change in tax rate deferred tax liability income tax expense	3.4
Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	261
State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 47

INCOME TAXES - Tax Provision_Be

INCOME TAXES - Tax Provision/Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Federal:
Current	$ (376)	$ 0	$ (1,092)
Deferred	3,634	(29,082)	(22,177)
Federal income tax expense (benefit)	3,258	(29,082)	(23,269)
State:
Current	74	0	(350)
Deferred	(204)	1,110	(1,769)
State income tax expense (benefit)	(130)	1,110	(2,119)
Income tax expense (benefit)	$ 3,128	$ (27,972)	$ (25,388)

INCOME TAXES - Tax Reconciliati

INCOME TAXES - Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	$ 5,510	$ (28,392)	$ (24,935)
State taxes, net of federal benefit	176	(216)	(885)
Permanent differences	1,582	498	579
Stock-based compensation	(655)	0	0
Valuation allowance	273	879	0
Effect of change in enacted Tax Act	(3,448)	0	0
Other	(310)	(741)	(147)
Income tax expense (benefit)	$ 3,128	$ (27,972)	$ (25,388)

INCOME TAXES - Deferred Tax Ass

INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Income Tax Assets
Accrued liabilities	$ 1,264	$ 334
Allowance for doubtful accounts	94	195
Goodwill and other intangible assets	5,304	10,953
Stock‑based compensation	2,960	1,692
Net operating losses	56,788	49,267
Other	69	389
Noncurrent deferred tax assets	66,479	62,830
Total deferred tax assets	66,479	62,830
Valuation allowance	(1,151)	(879)
Total deferred tax assets — net	65,328	61,951
Deferred Income Tax Liabilities
Property and equipment	(68,811)	(60,958)
Prepaid expenses	(965)	(1,506)
Other	(131)	(635)
Noncurrent deferred tax liabilities	(69,907)	(63,099)
Net deferred tax liability	$ (4,579)	$ (1,148)

RELATED_PARTY TRANSACTIONS (Det

RELATED‑PARTY TRANSACTIONS (Details)	12 Months Ended
	Dec. 31, 2017USD ($)property	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Related Party Transaction [Line Items]
Payable to related parties	$ 20,000	$ 0	$ 0
Receivable from related parties	$ 0	40,000	20,000
Related party leasing
Related Party Transaction [Line Items]
Lease term	5 years
Extension option term	5 years
Expenses with related party	$ 100,000
Number of properties adjacent to corporate office subject to leases | property	5
Related party leasing | Property 1
Related Party Transaction [Line Items]
Expenses with related party	$ 30,000
Related party leasing | Property 2
Related Party Transaction [Line Items]
Expenses with related party	30,000
Related party leasing | Property 3
Related Party Transaction [Line Items]
Expenses with related party	100,000
Related party leasing | Property 4
Related Party Transaction [Line Items]
Expenses with related party	100,000
Related party leasing | Property 5
Related Party Transaction [Line Items]
Expenses with related party	200,000
Related party transportation services
Related Party Transaction [Line Items]
Expenses with related party	300,000	200,000	200,000
Related party equipment rental
Related Party Transaction [Line Items]
Expenses with related party	$ 200,000	$ 200,000	$ 200,000

COMMITMENTS AND CONTINGENCIES72

COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Operating leases expense	$ 1,400	$ 1,400	$ 1,400
2,018	594
2,019	366
2,020	344
2,021	344
2022 and thereafter	431
Total	$ 2,079

EQUITY CAPITALIZATION (Details)

EQUITY CAPITALIZATION (Details) $ / shares in Units, $ in Thousands	Nov. 09, 2017$ / sharesshares	Mar. 28, 2017executivedirectorshares	Mar. 22, 2017USD ($)$ / sharesshares	Dec. 27, 2016USD ($)$ / sharesshares	Jun. 08, 2016USD ($)shares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)$ / sharesshares	Dec. 31, 2015USD ($)	Sep. 30, 2013$ / shares
Subsidiary, Sale of Stock [Line Items]
Proceeds from additional common equity capitalization | $						$ 0	$ 40,425	$ 0
Proceeds from preferred equity capitalization | $				$ 170,000		$ 0	$ 170,000	0
Preferred stock, par value (in dollars per share) | $ / shares						$ 0.001	$ 0.001
Payment of IPO costs | $						$ 0	$ 7,489	0
Preferred stock, issued (in shares)						0	16,999,990
Preferred stock, outstanding (in shares)						0	16,999,990
Common stock, par value (in dollars per share) | $ / shares						$ 0.001	$ 0.001		$ 0.001
Proceeds from IPO | $						$ 185,500	$ 0	0
Repayment of outstanding borrowings | $			$ 71,800			166,546	41,295	73,782
Capital expenditures | $			$ 86,800			$ 285,891	$ 42,832	$ 62,855
Number of executives | executive		1
Number of directors | director		1
Exercisable (in shares)		226,194
Exercised (in shares)		162,212				226,194
Common stock, outstanding (in shares)						83,039,854	52,627,652
Private Placement
Subsidiary, Sale of Stock [Line Items]
Shares of common stock sold, including shares sold by third parties (in shares)				16,999,990
Preferred stock, par value (in dollars per share) | $ / shares				$ 0.001
Payment of IPO costs | $				$ 7,000
Preferred equity capitalization, net of costs | $				$ 163,000
IPO
Subsidiary, Sale of Stock [Line Items]
Shares of common stock sold, including shares sold by third parties (in shares)			25,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.001
Stock price (in dollars per share) | $ / shares			$ 14
Proceeds from IPO | $			$ 170,100
Payment of underwriting discounts and commissions | $			10,900
Payments of stock issuance costs, other | $			$ 4,500
IPO Sold By Company
Subsidiary, Sale of Stock [Line Items]
Shares of common stock sold, including shares sold by third parties (in shares)			13,250,000
IPO sold by existing stockholders
Subsidiary, Sale of Stock [Line Items]
Shares of common stock sold, including shares sold by third parties (in shares)			11,750,000
Series A convertible preferred stock
Subsidiary, Sale of Stock [Line Items]
Preferred stock, issued (in shares)							16,999,990
Performance stock units | IPO
Subsidiary, Sale of Stock [Line Items]
Number of shares of outstanding stock converted (in shares)			16,999,990
Series A Preferred Stock Converted To Common Stock | IPO
Subsidiary, Sale of Stock [Line Items]
Shares of common stock issued for each share of preferred stock converted			1
Energy Capital Partners Affiliates
Subsidiary, Sale of Stock [Line Items]
Issuance of common stock (in shares)	13,800,000
Shares issued, price per share (in dollars per share) | $ / shares	$ 15.07
Energy Capital Partners Affiliates
Subsidiary, Sale of Stock [Line Items]
Proceeds from additional common equity capitalization | $					$ 40,400
Issuance of common stock (in shares)					18,007,328

QUARTERLY FINANCIAL DATA (UNA74

QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
REVENUE - Service revenue	$ 313,712	$ 282,730	$ 213,492	$ 171,931	$ 163,921	$ 116,904	$ 68,165	$ 87,930	$ 981,865	$ 436,920	$ 569,618
Gross profit	51,664	57,297	36,715	22,366	15,142	6,681	3,316	7,641
Net income (loss)	$ 10,078	$ 21,965	$ 4,921	$ (24,351)	$ (17,315)	$ (13,598)	$ (9,294)	$ (12,940)	$ 24,113	$ (67,386)	$ (49,101)
NET INCOME (LOSS) PER COMMON SHARE:
Basic (in dollars per share)	$ 0.12	$ 0.26	$ 0.06	$ (0.43)	$ (0.33)	$ (0.26)	$ (0.24)	$ (0.37)	$ 0.17	$ (1.19)	$ (1.31)
Diluted (in dollars per share)	$ 0.12	$ 0.25	$ 0.06	$ (0.43)	$ (0.33)	$ (0.26)	$ (0.24)	$ (0.37)	$ 0.16	$ (1.19)	$ (1.31)
Weighted average common shares outstanding:
Basic (in shares)	83,040	83,040	83,040	55,996	52,628	52,975	39,496	34,993	76,371	44,787	34,993
Diluted (in shares)	86,818	86,264	86,279	55,996	52,628	52,975	39,496	34,993	79,583	44,787	34,993