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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.

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Face (par) amount of debt instrument at time of issuance.

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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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Fair value amount of debt instrument that was repurchased.

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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.

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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.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Long-Term Debt - Additional Information - Senior Bonds (Details)	1 Months Ended	3 Months Ended	6 Months Ended
	May 31, 2014 USD ($)	Nov. 30, 2013 USD ($)	Jun. 30, 2018 USD ($) vessel	Jul. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Aug. 31, 2017 USD ($)	Feb. 28, 2015 USD ($)
Debt Instrument [Line Items]
Carrying amount of debt			$ 2,966,208,000		$ 3,123,728,000
Total principal			3,014,628,000		3,173,229,000
U.S. Dollar Bonds due through 2022
Debt Instrument [Line Items]
Debt issued	$ 300,000,000		300,000,000
Bonds \| Senior Bonds due in June 2024
Debt Instrument [Line Items]
Debt instrument, face amount							$ 30,000,000
Carrying amount of debt			$ 20,300,000
Fixed interest rate			4.27%
Bonds \| Ten Year Senior Secured Bonds
Debt Instrument [Line Items]
Debt instrument, face amount		$ 174,200,000
Carrying amount of debt			$ 137,900,000
Fixed interest rate		4.96%
Debt instrument, term		10 years
Number of vessels \| vessel			2
Bonds \| Senior Unsecured Bonds Due In August 2022
Debt Instrument [Line Items]
Debt instrument, face amount						$ 250.0
Total principal			$ 250,000,000
Interest rate, percentage						7.125%
Bonds \| U.S. Dollar Bonds due through 2022
Debt Instrument [Line Items]
Fixed interest rate	6.00%
Debt instrument, term	5 years
Total principal					$ 550,000,000
Subsequent Event \| Bonds \| U.S. Dollar Bonds due through 2022
Debt Instrument [Line Items]
Debt repurchase amount				$ 225,200,000