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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of contractual obligation due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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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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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

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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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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Carrying amount as of the balance sheet date of expenditures made in advance of when the economic benefit of the cost will be realized, and which will be expensed in future periods with the passage of time or when a triggering event occurs.

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Commitments and Contingencies - Additional Information - ALP (Details) $ in Thousands	1 Months Ended	12 Months Ended			14 Months Ended
	Mar. 31, 2014 USD ($) vessel	Dec. 31, 2017 USD ($) newbuilding	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Oct. 31, 2017 vessel
Loss Contingencies [Line Items]
Payments due to delay in delivery of unit		$ 533,260	$ 294,581	$ 664,667
Aggregate principal amount		3,173,229	3,237,703
ALP Maritime Services B.V.
Loss Contingencies [Line Items]
Percentage of ownership interest acquired	100.00%
Number of vessels \| vessel					3
Expected cost of newbuildings	$ 258,000
Payments made towards the commitment		233,900
Payments due in 2018		23,700
ALP Maritime Services B.V. \| Newbuildings
Loss Contingencies [Line Items]
Number of vessels \| vessel	4
Undrawn borrowings		22,600
ALP Maritime Services B.V. \| Newbuildings \| Long-term debt
Loss Contingencies [Line Items]
Aggregate principal amount		$ 185,000
ALP Maritime Services B.V. \| Newbuildings \| Reimbursements
Loss Contingencies [Line Items]
Number of vessels \| newbuilding		3
Payments due to delay in delivery of unit		$ 24,600	$ 7,000