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Long-term debt (Additional Required Disclosures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Interest cost	$ 52,079	$ 52,868	$ 68,357
2027 Notes
Debt Instrument [Line Items]
Interest Expense	15,569	15,569	11,547
DFC Amortization	299	299	224
Amortization of Discount, net	0	0	0
2023 Notes
Debt Instrument [Line Items]
Interest Expense	23,060	23,060	23,885
DFC Amortization	323	323	610
Amortization of Discount, net	402	397	752
Subsidiaries | Secured Debt
Debt Instrument [Line Items]
Interest Expense	0	0	2,570
DFC Amortization	0	0	3,251
Amortization of Discount, net	$ 0	$ 0	2,249
Cross-Currency Interest Rate Swaps | Subsidiaries | Secured Debt
Debt Instrument [Line Items]
Loss not including effect of cross-currency interest rate swap agreements			6,921
Interest cost			$ 9,491

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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