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Long-term Debt (Details) $ in Thousands	2 Months Ended	12 Months Ended
	Feb. 28, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Aug. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2014 USD ($)
Long-term debt [Line Items]
Cash and cash equivalents		$ 257,911	$ 181,758	$ 208,056			$ 86,000
Restricted cash		$ 7,169	$ 5,121
Weighted average interest rate		4.72%	4.13%	3.69%
Unused credit facilities, commitment fee		$ 6	$ 472	$ 3,157
Number of vessels		71
Loan reference interest rate		LIBOR
Write off of unamortized deferred financing fees		$ 1,257	2,375	$ 974
Subsequent Event
Long-term debt [Line Items]
Excess Cash	$ 35,632
Not legally restricted
Long-term debt [Line Items]
Cash and cash equivalents		51,359	47,566
Legally restricted
Long-term debt [Line Items]
Restricted cash		15,589	$ 14,004
8.30% 2022 Notes
Long-term debt [Line Items]
Unamortized debt issuance costs		$ 2,000
First-priority mortgage
Long-term debt [Line Items]
Number of vessels		63
Amount of vessels pledged as collateral		$ 1,449,547
Cross collateral, Bareboat vessels
Long-term debt [Line Items]
Capital leased assets, Number of vessels		8
Capital leased assets, Net book value		$ 325,301
Restructuring letter agreements
Long-term debt [Line Items]
Amount of equity to be raised under debt instrument covenants						$ 50,000
Prepayment amount					$ 3,635
Percentage of the equity used for acquisition of vessels					20.00%
Excess Cash		$ 6,133
Restructuring letter agreements | Subsequent Event
Long-term debt [Line Items]
Excess Cash	$ 35,632

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The total gross amount less the charge for the use of the long-lived depreciable assets subject to a lease meeting the criteria for capitalization.

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Amount of assets pledged to secure a debt instrument.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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