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Long-term Debt - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 08, 2019	Jul. 31, 2018	May 31, 2018	Feb. 28, 2018	Sep. 30, 2016
Debt Instrument [Line Items]
Loan reference interest rate	LIBOR
Write off of unamortized issuance costs	$ 2,383	$ 1,257	$ 2,375
Cash and cash equivalents	204,921	257,911	181,758
Restricted cash	$ 6,435	$ 7,169	$ 5,121
Weighted average interest rate	5.59%	4.72%	4.13%
Unused credit facilities, commitment fee	$ 1,049	$ 6	$ 472
Not legally restricted
Debt Instrument [Line Items]
Cash and cash equivalents	53,500	51,359
Legally restricted
Debt Instrument [Line Items]
Restricted cash	$ 8,956	15,589
Restructuring Letter Agreements
Debt Instrument [Line Items]
Prepayment amount		$ 9,768			$ 22,723	$ 30,000	$ 35,632
Amount of equity to be raised under debt instrument covenants								$ 50,000
NBG $30,000 Facility | Star Delta | Subsequent Event
Debt Instrument [Line Items]
Prepayment amount				$ 3,537

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States the amount of equity that the company is obliged to raise under the debt instrument covenants.

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Amount of debt prepaid.

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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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Amount of commitment fees for the unused borrowing capacity under the long-term financing arrangement that is available to the entity.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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