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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, at carrying value | $ 112,653 | $ 85,909 | $ 51,777 | $ 161,558
Restricted cash | 59,703 | 71,708 |  |
Current maturities of long-term debt | (3,375) | (31,676) |  |
Long-term debt | (1,022,004) | (1,030,205) |  |
Carrying Amount | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents, at carrying value | 112,653 | 85,909 |  |
Restricted cash | 59,703 | 71,708 |  |
Current maturities of long-term debt | (3,375) | (31,676) |  |
Long-term debt | (1,022,004) | (1,030,205) |  |
Carrying Amount | Fair Value, Measurements, Recurring | Interest rate swaps |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Interest rate swaps, assets | 15,440 |  |  |
Interest rate swaps, liabilities |  | 11,225 |  |
Carrying Amount | Fair Value, Measurements, Recurring | Foreign currency exchange contracts |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Foreign currency option contracts | 2,807 | 464 |  |
Carrying Amount | Fair Value, Measurements, Recurring | Foreign currency option contracts |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Foreign currency option contracts | 352 | 391 |  |
Fair Value | Level 1 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and cash equivalents | 112,653 | 85,909 |  |
Restricted cash | 59,703 | 71,708 |  |
Current maturities of long-term debt | 0 | 0 |  |
Long-term debt | 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 option contracts | 0 | 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 option contracts | 0 | 0 |  |
Fair Value | Level 2 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Current maturities of long-term debt | (3,375) | (31,984) |  |
Long-term debt | (1,030,135) | (1,030,708) |  |
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 | 15,440 |  |  |
Interest rate swaps, liabilities |  | 11,225 |  |
Fair Value | Level 2 | Fair Value, Measurements, Recurring | Foreign currency exchange contracts |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Foreign currency option contracts | 2,807 | 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 option contracts | $ 352 | $ 391 |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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