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Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Nov. 03, 2016 | Aug. 31, 2013
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Capital Leases | $ 1,852 | $ 2,324 |  |
Total | 1,884,921 | 1,870,528 |  |
Less - current portion | 27,115 | 47,225 |  |
Long-term portion | 1,857,806 | 1,823,303 |  |
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized discount and debt issuance cost | 3,254 | 2,451 |  |
Line of Credit | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 865,165 | 853,124 |  |
Other Borrowings |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | 9,740 | 6,860 |  |
Senior Notes Due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 747,788 | 747,655 |  |
Stated interest rate (as a percent) | 3.45% |  |  |
Senior Notes Due 2026 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 747,788 | 747,655 |  |
Stated interest rate (as a percent) |  |  | 3.45% |
Unamortized discount and debt issuance cost | 2,212 | 2,345 |  |
4.375% Senior Notes, due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 248,695 | 248,567 |  |
Stated interest rate (as a percent) | 4.375% |  |  |
4.375% Senior Notes, due 2023 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 248,695 | 248,567 |  |
Stated interest rate (as a percent) |  |  |  | 4.375%
Unamortized discount and debt issuance cost | 1,305 | 1,433 |  |
Schuldschein Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt | $ 11,681 | $ 11,998 |  |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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