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Shareholders' equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 1,340,924	$ 995,041	$ 2,553,005
Other comprehensive loss before reclassifications	(10,920)	(14,182)	17,438
Amounts reclassified from AOCL	4,834	9,439	37,212
Other comprehensive (loss) income, net of tax	(6,086)	(4,743)	54,209
Reclassification of stranded tax effects to retained earnings		(24,845)
Ending Balance	1,590,377	1,340,924	995,041
Retirement Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(136,893)	(107,037)	(124,978)
Other comprehensive loss before reclassifications	(10,339)	(14,450)	12,496
Amounts reclassified from AOCL	4,834	9,439	5,445
Other comprehensive (loss) income, net of tax		(5,011)
Reclassification of stranded tax effects to retained earnings		(24,845)
Ending Balance	(142,398)	(136,893)	(107,037)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	382	114	(28,560)
Other comprehensive loss before reclassifications	(581)	268	6,649
Amounts reclassified from AOCL	0	0	22,025
Other comprehensive (loss) income, net of tax		268
Reclassification of stranded tax effects to retained earnings		0
Ending Balance	(199)	382	114
Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance		0	(8,035)
Other comprehensive loss before reclassifications			(1,707)
Amounts reclassified from AOCL			9,742
Ending Balance			0
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(136,511)	(106,923)	(161,573)
Ending Balance	$ (142,597)	$ (136,511)	$ (106,923)

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Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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