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Derivative Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2018
Derivative Instrument Detail [Abstract] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | The fair values of our derivative instruments were as follows:
|  |  |  | Fair Value
Asset Derivatives |  | Balance Sheet Location |  | March 31, 2018 |  | December 31, 2017
Derivatives designated as hedging instruments under ASC 815-20 |  | (in thousands)
Interest rate swap contracts |  | Other current assets |  | $ | 1,303 |  |  | $ | 658 |
Interest rate cap contracts |  | Other current assets |  | 74 |  |  | 17 |
Interest rate swap contracts |  | Other long-term assets |  | 2,226 |  |  | 1,712 |
Interest rate cap contracts |  | Other long-term assets |  | 310 |  |  | 179 |
Derivatives not designated as hedging instruments under ASC 815-20 |  |  |  |
Foreign exchange forward contracts |  | Other current assets |  | 44 |  |  | 41 |
Interest rate cap contracts |  | Other current assets |  | 111 |  |  | 25 |
Interest rate cap contracts |  | Other long-term assets |  | 464 |  |  | 268 |
Total asset derivatives |  |  |  | $ | 4,532 |  |  | $ | 2,900 |
Liability Derivatives |  |  |  |  |  |
Derivatives not designated as hedging instruments under ASC 815-20 |  |  |  |
Foreign exchange forward contracts |  | Other current liabilities |  | $ | 356 |  |  | $ | 289 |
Accumulated OCI for Derivative and Nonderivative Instruments Designated as Hedging Instruments, Net of Tax [Table Text Block] | The changes in accumulated other comprehensive income (loss) (AOCI), net of tax, for our derivative and nonderivative hedging instruments, were as follows:
| 2018 |  | 2017
| (in thousands)
Net unrealized gain (loss) on hedging instruments at January 1, | $ | (13,414 | ) |  | $ | (14,337 | )
Unrealized gain (loss) on hedging instruments | 1,183 |  |  | 60 |
Realized loss (gain) reclassified into net income | (14 | ) |  | 232 |
Net unrealized gain (loss) on hedging instruments at March 31, | $ | (12,245 | ) |  | $ | (14,045 | )
Offsetting Assets [Table Text Block] | A summary of the 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 of Recognized Assets Presented in the Consolidated Balance Sheets |  | Gross Amounts Not Offset in the Consolidated Balance Sheets |  |
|  | Derivative Financial Instruments |  | Cash Collateral Received |  | Net Amount
| (in thousands)
March 31, 2018 | $ | 4,532 |  |  | $ | (128 | ) |  | $ | — |  |  | $ | 4,404 |
December 31, 2017 | $ | 2,900 |  |  | $ | (90 | ) |  | $ | — |  |  | $ | 2,810 |
Offsetting Liabilities [Table Text Block] |
Offsetting of Derivative Liabilities | Gross Amounts of Recognized Liabilities Presented in the Consolidated Balance Sheets |  | Gross Amounts Not Offset in the Consolidated Balance Sheets |  |
|  | Derivative Financial Instruments |  | Cash Collateral Pledged |  | Net Amount
| (in thousands)
March 31, 2018 | $ | 356 |  |  | $ | (128 | ) |  | $ | — |  |  | $ | 228 |
December 31, 2017 | $ | 289 |  |  | $ | (90 | ) |  | $ | — |  |  | $ | 199 |
Effect of Cash Flow Derivatives on the Balance Sheet and Income Statement, Before Tax [Table Text Block] | The before-tax effects of our derivative instruments designated as hedges on the Consolidated Balance Sheets and the Consolidated Statements of Operations were as follows:
Derivatives in ASC 815-20 Cash Flow Hedging Relationships |  | Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) |  | Gain (Loss) Reclassified from Accumulated AOCI into Income (Effective Portion) |  | Gain (Loss) Recognized in Income on Derivative (Ineffective Portion)
Location |  | Amount |  | Location |  | Amount
|  | 2018 |  | 2017 |  |  |  | 2018 |  | 2017 |  |  |  | 2018 |  | 2017
|  | (in thousands) |  |  |  | (in thousands) |  |  |  | (in thousands)
Three Months Ended March 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap contracts |  | $ | 1,247 |  |  | $ | 181 |  |  | Interest expense |  | $ | 88 |  |  | $ | (335 | ) |  | Interest expense |  | $ | — |  |  | $ | — |
Interest rate cap contracts |  | 188 |  |  | (84 | ) |  | Interest expense |  | (70 | ) |  | (43 | ) |  | Interest expense |  | — |  |  | — |
Foreign Exchange Derivatives Not Designated As Hedging Instruments [Table Text Block] | The effect of our derivative instruments not designated as hedges on the Consolidated Statements of Operations was as follows:
Derivatives Not Designated as Hedging Instrument under ASC 815-20 |  | Location |  | Gain (Loss) Recognized on Derivatives in Other Income (Expense)
|  |  |  | Three Months Ended March 31,
|  |  |  | 2018 |  | 2017
|  |  |  | (in thousands)
Foreign exchange forward contracts |  | Other income (expense), net |  | $ | (1,523 | ) |  | $ | (1,742 | )
Interest rate cap contracts |  | Interest expense |  | 282 |  |  | (126 | )

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