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Derivative Instruments, Hedging Activities and Fair Value (Details 5) - USD ($) $ in Thousands | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2017 | Jan. 31, 2017 | Dec. 31, 2016
Unit Adjustment Liability, Infrastructure Transaction |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Balance at beginning of period | $ 79,934 |  |  |
Reduction in the fair value related to election not to make 2016 payments | (19,145) |  |  |
Change in fair value to the unit adjustment liability | 3,402 |  |  |
Balance at end of period | $ 64,191 |  |  |
Fair value measurements recurring | Level 2 |  |  |  |
Assets |  |  |  |
Foreign currency forward exchange contracts |  | $ 3,206 |  | $ 4,932
Liabilities |  |  |  |
Foreign currency forward exchange contracts |  | 17,191 |  | 3,538
Term Loan Facility, Fixed-Rate | Term Loan |  |  |  |
Fair value of financial instruments |  |  |  |
Principal amount |  |  | $ 300,000 |
Interest rate swaps | Fair value measurements recurring | Level 2 |  |  |  |
Assets |  |  |  |
Cross-currency interest rate swaps |  | 35 |  |
Liabilities |  |  |  |
Interest rate swaps |  | 2,578 |  |
Cross currency interest rate swaps | Fair value measurements recurring | Level 2 |  |  |  |
Assets |  |  |  |
Cross-currency interest rate swaps |  | $ 206 |  | $ 514

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