Long-Term Debt - Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total principal	$ 3,173,229	$ 3,237,703
Less debt issuance costs and other	(49,501)	(54,809)
Total debt	3,123,728	3,182,894
Less current portion	(589,767)	(586,892)
Long-term portion	2,533,961	2,596,002
Revolving credit facility
Debt Instrument [Line Items]
Total principal	629,667	291,764
Bonds \| Norwegian Kroner Bonds due through 2019
Debt Instrument [Line Items]
Total principal	121,889	256,927
Bonds \| U.S. Dollar Non-Public Bonds due through 2024
Debt Instrument [Line Items]
Total principal	162,659	166,680
Bonds \| U.S. Dollar Bonds due through 2022
Debt Instrument [Line Items]
Total principal	550,000	300,000
Term loans \| U.S. Dollar-denominated Term Loans due through 2021
Debt Instrument [Line Items]
Total principal	85,574	112,406
Term loans \| U.S. Dollar-denominated Term Loans due through 2028
Debt Instrument [Line Items]
Total principal	$ 1,623,440	$ 2,109,926

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-Subparagraph (SX 210.9-03(16))
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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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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.

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