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Income taxes (Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income tax expense (benefit) at the statutory rate									$ (48,300)	$ (47,013)	$ 84,882
State taxes, net of federal tax benefit									(1,425)	(1,157)	4,132
Non-U.S. operations									(5,791)	6,300	(15,060)
Domestic incentives									(170)	(250)	(4,412)
Prior year federal, non-U.S. and state tax									(777)	(518)	(1,692)
Nondeductible expenses									345	279	663
Goodwill impairment									0	27,210	0
Other									67	210	(368)
Provision for income tax expense (benefit)	$ (12,677)	$ (11,821)	$ (21,147)	$ (10,406)	$ (28,387)	$ 932	$ 1,911	$ 10,605	$ (56,051)	$ (14,939)	$ 68,145
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Income tax expense (benefit) at the statutory rate									35.00%	35.00%	35.00%
State taxes, net of federal tax benefit									1.00%	0.90%	1.70%
Non-U.S. operations									4.20%	(4.70%)	(6.20%)
Domestic incentives									0.10%	0.20%	(1.80%)
Prior year federal, non-U.S. and state tax									0.60%	0.40%	(0.70%)
Nondeductible expenses									(0.20%)	(0.20%)	0.30%
Goodwill impairment									0.00%	(20.30%)	0.00%
Other									(0.10%)	(0.20%)	(0.20%)
Effective income tax rate									40.60%	11.10%	28.10%

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