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Derivative Financial Instruments Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The fair values of our derivative instruments are as follows:
|  |  |  | Fair Value
|  | Balance Sheet Location |  | December 31, 2016 |  | December 31, 2015
|  |  |  | (in thousands)
Asset Derivatives |  |  |  |
Derivatives designated as hedging instruments under ASC 815-20 |  |  |  |
Interest rate cap contracts |  | Other current assets |  | $ | 3 |  |  | $ | — |
Interest rate swap contracts |  | Other long-term assets |  | 1,830 |  |  | 1,632 |
Interest rate cap contracts |  | Other long-term assets |  | 376 |  |  | 1,423 |
Derivatives not designated as hedging instruments under ASC 815-20 |  |  |  |
Foreign exchange forward contracts |  | Other current assets |  | 169 |  |  | 27 |
Interest rate cap contracts |  | Other current assets |  | 4 |  |  | — |
Interest rate cap contracts |  | Other long-term assets |  | 563 |  |  | — |
Total asset derivatives |  |  |  | $ | 2,945 |  |  | $ | 3,082 |
Liability Derivatives |  |  |  |  |  |
Derivatives designated as hedging instruments under ASC 815-20 |  |  |  |
Interest rate swap contracts |  | Other current liabilities |  | $ | 934 |  |  | $ | 868 |
Derivatives not designated as hedging instruments under ASC 815-20 |  |  |  |
Foreign exchange forward contracts |  | Other current liabilities |  | 449 |  |  | 99 |
Total liability derivatives |  |  |  | $ | 1,383 |  |  | $ | 967 |
Accumulated OCI for Derivative and Nonderivative Instruments Designated as Hedging Instruments, Net of Tax [Table Text Block] | OCI during the reporting period for our derivative and nonderivative instruments designated as hedging instruments, net of tax, was as follows:
| 2016 |  | 2015 |  | 2014
| (in thousands)
Net unrealized gain (loss) on hedging instruments at January 1, | $ | (14,062 | ) |  | $ | (15,148 | ) |  | $ | (15,636 | )
Unrealized gain (loss) on derivative instruments | (1,087 | ) |  | 76 |  |  | (566 | )
Realized (gains) losses reclassified into net income (loss) | 812 |  |  | 1,010 |  |  | 1,054 |
Net unrealized gain (loss) on hedging instruments at December 31, | $ | (14,337 | ) |  | $ | (14,062 | ) |  | $ | (15,148 | )
Offsetting Assets [Table Text Block] | A summary of the potential effect of netting arrangements on our financial position related to the offsetting of our recognized derivative assets and liabilities under master netting arrangements or similar agreements is as follows:
Offsetting of Derivative Assets |  |  |  |  |
|  |  | Gross Amounts Not Offset in the Consolidated Balance Sheets |  |
| Gross Amounts of Recognized Assets Presented in the Consolidated Balance Sheets |  | Derivative Financial Instruments |  | Cash Collateral Received |  | Net Amount
| (in thousands)
December 31, 2016 | $ | 2,945 |  |  | $ | (1,322 | ) |  | $ | — |  |  | $ | 1,623 |
December 31, 2015 | $ | 3,082 |  |  | $ | (565 | ) |  | $ | — |  |  | $ | 2,517 |
Offsetting Liabilities [Table Text Block] |
Offsetting of Derivative Liabilities |  |  |  |  |
|  |  | Gross Amounts Not Offset in the Consolidated Balance Sheets |  |
| Gross Amounts of Recognized Liabilities Presented in the Consolidated Balance Sheets |  | Derivative Financial Instruments |  | Cash Collateral Pledged |  | Net Amount
| (in thousands)
December 31, 2016 | $ | 1,383 |  |  | $ | (1,322 | ) |  | $ | — |  |  | $ | 61 |
December 31, 2015 | $ | 967 |  |  | $ | (565 | ) |  | $ | — |  |  | $ | 402 |
Derivative Instruments, Gain (Loss) [Table Text Block] | The before-tax effects of our cash flow derivative hedging instruments on the Consolidated Balance Sheets and the Consolidated Statements of Operations for the years ended December 31 are as follows:
Derivatives in ASC 815 Cash Flow Hedging Relationships |  | Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) |  | Loss Reclassified from AOCI into Income (Effective Portion) |  | Loss Recognized in Income on Derivative (Ineffective Portion)
Location |  | Amount |  | Location |  | Amount
|  | 2016 |  | 2015 |  | 2014 |  |  |  | 2016 |  | 2015 |  | 2014 |  |  |  | 2016 |  | 2015 |  | 2014
|  | (in thousands) |  |  |  | (in thousands) |  |  |  | (in thousands)
Interest rate swap contracts |  | $ | (1,163 | ) |  | $ | 367 |  |  | $ | (915 | ) |  | Interest expense |  | $ | (1,296 | ) |  | $ | (1,639 | ) |  | $ | (1,704 | ) |  | Interest expense |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest rate cap contracts |  | $ | (605 | ) |  | $ | (244 | ) |  | $ | — |  |  | Interest expense |  | $ | (27 | ) |  | $ | — |  |  | $ | — |  |  | Interest expense |  | $ | (1 | ) |  | $ | — |  |  | $ | — |
Foreign Exchange Derivatives Not Designated As Hedging Instruments [Table Text Block] | The before-tax effects of our derivatives not designated as hedging instruments on the Consolidated Statements of Operations for the years ended December 31 are as follows:
Derivatives Not Designated as Hedging Instrument under ASC 815 |  | Location |  | Gain (Loss) Recognized in Income on Derivative
|  |  |  | 2016 |  | 2015 |  | 2014
|  |  |  | (in thousands)
Foreign exchange forward contracts |  | Other income (expense), net |  | $ | 537 |  |  | $ | (3,145 | ) |  | $ | (5,248 | )
Interest rate cap contracts |  | Interest expense |  | $ | 129 |  |  | $ | — |  |  | $ | — |

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