Number of Carrier Newbuildings

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Working Capital Surplus (Deficit)

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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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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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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The cash outflow from construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service.

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Commitments and Contingencies - Presentation of Financial Statements (Narrative) (Details) $ in Thousands	9 Months Ended		48 Months Ended
	Sep. 30, 2018 USD ($) newbuilding	Sep. 30, 2017 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Net operating cash flow	$ 74,545	$ 196,107
Working capital deficit	426,000
Scheduled maturities and repayments of outstanding debt	$ 556,498			$ 589,767
Number of newbuildings \| newbuilding	6
Scenario, Forecast
Loss Contingencies [Line Items]
Payments related to commitments to fund vessels under construction during 2018 through 2021			$ 795,000