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Accounts Payable and Accrued Expenses - Summary of Current Portion of Earn-out Liabilities and Long term Portion of Earn-out Liability (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Business Acquisition Contingent Consideration [Line Items] |  |  |
Balance of earn-out at beginning of period | $ 24,214 | $ 32,671 |
Fair value adjustment | (5,689) | 460 |
Compensation expense adjustment | 918 | 923 |
Foreign currency translation adjustment | 729 | (539) |
Settlement through an exchange of accounts receivable |  | (3,272) |
Payment | (15,193) | (9,270) |
Total earn-out liability at end of period | 4,979 | 20,973 |
Less: current portion of earn-out | (3,514) | (11,258) | $ (13,527)
Balance of long term portion of earn-out recorded in Other liabilities at end of period | 1,465 | 9,715 |
Energy Segment [Member] |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |
Balance of earn-out at beginning of period | 24,214 | 29,304 |
Fair value adjustment | (5,689) | 960 |
Compensation expense adjustment | 918 | 923 |
Foreign currency translation adjustment | 729 | (539) |
Settlement through an exchange of accounts receivable |  | (3,272) |
Payment | (15,193) | (8,170) |
Total earn-out liability at end of period | 4,979 | 19,206 |
Less: current portion of earn-out | (3,514) | (9,991) |
Balance of long term portion of earn-out recorded in Other liabilities at end of period | $ 1,465 | 9,215 |
Environmental Segment [Member] |  |  |
Business Acquisition Contingent Consideration [Line Items] |  |  |
Balance of earn-out at beginning of period |  | 3,367 |
Fair value adjustment |  | (500) |
Payment |  | (1,100) |
Total earn-out liability at end of period |  | 1,767 |
Less: current portion of earn-out |  | (1,267) |
Balance of long term portion of earn-out recorded in Other liabilities at end of period |  | $ 500 |

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