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Income taxes (Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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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