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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Section S99
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Face (par) amount of debt instrument at time of issuance.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Fixed interest rate related to the interest rate derivative.

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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
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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Long-Term Debt - Additional Information - Senior Bonds (Details)	1 Months Ended	3 Months Ended
	May 31, 2014 USD ($)	Nov. 30, 2013 USD ($) vessel	Dec. 31, 2017 USD ($)	Aug. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Feb. 28, 2015 USD ($)
Debt Instrument [Line Items]
Carrying amount of debt			$ 3,123,728,000		$ 3,182,894,000
Aggregate principal amount			3,173,229,000		$ 3,237,703,000
Bonds \| Senior Bonds due in June 2024
Debt Instrument [Line Items]
Debt instrument, face amount						$ 30,000,000
Carrying amount of debt			$ 22,000,000
Fixed interest rate			4.27%
Bonds \| 10-Year Senior Secured Bonds
Debt Instrument [Line Items]
Debt instrument, face amount		$ 174,200,000
Carrying amount of debt			$ 140,700,000
Fixed interest rate		4.96%
Debt instrument term (in years)		10 years
Number of vessels \| vessel		2
Bonds \| Senior Unsecured Bonds due in August 2022
Debt Instrument [Line Items]
Debt instrument, face amount				$ 250,000,000.0
Aggregate principal amount			250,000,000
Interest rate, percentage				7.125%
Bonds \| U.S. Dollar Bonds due through 2022
Debt Instrument [Line Items]
Debt instrument, face amount	$ 300,000,000
Fixed interest rate	6.00%
Debt instrument term (in years)	5 years
Aggregate principal amount			$ 300,000,000