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Fair Value Measurements - Carrying Amounts and Fair Values (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | $ 85,909 | $ 51,777 | $ 161,558 | $ 199,644
Restricted cash | 71,708 | 23,525 |  |
Current maturities of long-term debt | (31,676) | 0 |  |
Long-term debt (c) | (1,030,205) | (830,554) |  |
Carrying Amount | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 85,909 |  |  |
Cash and cash equivalents |  | 51,777 |  |
Restricted cash | 71,708 | 23,525 |  |
Current maturities of long-term debt | (31,676) | 0 |  |
Long-term debt (c) | (1,030,205) | (830,554) |  |
Carrying Amount | Fair Value, Measurements, Recurring | Interest rate swaps |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Interest rate swaps, assets | 11,225 |  |  |
Interest rate swaps, liabilities |  | (18,244) |  |
Carrying Amount | Fair Value, Measurements, Recurring | Foreign currency exchange contracts |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Foreign Currency Contracts, Liability |  | (1,625) |  |
Foreign Currency Contracts, Asset | 464 |  |  |
Carrying Amount | Fair Value, Measurements, Recurring | Foreign currency option contracts |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Foreign Currency Contracts, Asset | 391 | 3,964 |  |
Fair Value | Level 1 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 85,909 | 51,777 |  |
Restricted cash | 71,708 | 23,525 |  |
Current maturities of long-term debt | 0 | 0 |  |
Long-term debt (c) | 0 | 0 |  |
Fair Value | Level 1 | Fair Value, Measurements, Recurring | Interest rate swaps |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Interest rate swaps, assets | 0 |  |  |
Interest rate swaps, liabilities |  | 0 |  |
Fair Value | Level 1 | Fair Value, Measurements, Recurring | Foreign currency exchange contracts |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Foreign Currency Contracts, Liability |  | 0 |  |
Foreign Currency Contracts, Asset | 0 |  |  |
Fair Value | Level 1 | Fair Value, Measurements, Recurring | Foreign currency option contracts |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Foreign Currency Contracts, Asset | 0 | 0 |  |
Fair Value | Level 2 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Restricted cash | 0 | 0 |  |
Current maturities of long-term debt | (31,984) | 0 |  |
Long-term debt (c) | (1,030,708) | (830,203) |  |
Fair Value | Level 2 | Fair Value, Measurements, Recurring | Interest rate swaps |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Interest rate swaps, assets | 11,225 |  |  |
Interest rate swaps, liabilities |  | (18,244) |  |
Fair Value | Level 2 | Fair Value, Measurements, Recurring | Foreign currency exchange contracts |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Foreign Currency Contracts, Liability |  | (1,625) |  |
Foreign Currency Contracts, Asset | 464 |  |  |
Fair Value | Level 2 | Fair Value, Measurements, Recurring | Foreign currency option contracts |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Foreign Currency Contracts, Asset | $ 391 | $ 3,964 |  |

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