Long-Term Debt - Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total principal	$ 3,014,628	$ 3,173,229
Less debt issuance costs and other	(48,420)	(49,501)
Total debt	2,966,208	3,123,728
Less current portion	(473,691)	(589,767)
Long-term portion	2,492,517	2,533,961
U.S. Dollar-denominated Revolving Credit Facilities due through 2022
Debt Instrument [Line Items]
Total principal	598,750	629,667
Bonds \| Norwegian Kroner Bonds due through 2019
Debt Instrument [Line Items]
Total principal	122,739	121,889
Bonds \| U.S. Dollar Non-Public Bonds due through 2024
Debt Instrument [Line Items]
Total principal	158,196	162,659
Bonds \| US Dollar Denominated Term Loans Due Through 2022 [Member]
Debt Instrument [Line Items]
Total principal	550,000
Bonds \| U.S. Dollar Bonds due through 2022
Debt Instrument [Line Items]
Total principal		550,000
Long-term Debt \| U.S. Dollar-denominated Term Loans due through 2021
Debt Instrument [Line Items]
Total principal	76,821	85,574
Long-term Debt \| US Dollar Denominated Term Loans Due Through 2030 [Member]
Debt Instrument [Line Items]
Total principal	$ 1,508,122
Long-term Debt \| U.S. Dollar-denominated Term Loans due through 2030
Debt Instrument [Line Items]
Total principal		$ 1,623,440

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
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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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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.

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

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section S99
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-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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