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Long-term debt - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jul. 31, 2018	May 31, 2018	Feb. 28, 2018	Sep. 30, 2016
Debt Instrument [Line Items]
Loan reference interest rate	LIBOR
Cash and cash equivalents	$ 117,819	$ 204,921	$ 257,911
Restricted cash	$ 7,422	$ 6,435	$ 7,169
Weighted average interest rate	5.28%	5.59%	4.72%
Unused credit facilities, commitment fee	$ 806	$ 1,049	$ 6
Write off of unamortized issuance costs	3,526	2,383	1,257
Prepayment fees incurred	2,297
Write off of unamortized issuance costs excluding prepayment fees incurred
Debt Instrument [Line Items]
Write off of unamortized issuance costs	1,229
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
Legally restricted
Debt Instrument [Line Items]
Restricted cash	8,443	8,956
Not legally restricted
Debt Instrument [Line Items]
Cash and cash equivalents	$ 58,000	$ 53,500

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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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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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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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 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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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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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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