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Income taxes (Reconciliation of statutory income tax expense to provision for income taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory income tax rate	12.50%	12.50%	12.50%
Income tax expense at statutory income tax rate of 12.5%	$ 143,866	$ 154,484	$ 150,050
Permanent differences	1,016	23,737	29,057
Foreign rate differential	(803)	(13,503)	(5,611)
Differences between statutory and actual income tax expense	213	10,234	23,446
Provision for income taxes	$ 144,079	$ 164,718	$ 173,496

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).

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