Supplemental Equity Information - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance		$ 995,041		$ 995,041	$ 2,553,005
Amounts reclassified from AOCL	$ 969		$ 11,174	6,593	12,452
Other comprehensive income, net of tax	1,252		12,599	7,026	13,847
Reclassification of stranded tax effects to retained earnings		24,800
Ending Balance	1,116,911		874,178	1,116,911	874,178
Retirement Plans
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(126,257)	(107,037)	(126,063)	(107,037)	(127,341)
Other comprehensive income (loss) before reclassifications	0		0	0	0
Amounts reclassified from AOCL	969		1,431	6,593	2,709
Other comprehensive income, net of tax	969		1,431	6,593	2,709
Reclassification of stranded tax effects to retained earnings				(24,844)
Ending Balance	(125,288)	(126,257)	(124,632)	(125,288)	(124,632)
Foreign Currency Translation
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	264	114	(27,363)	114	(28,560)
Other comprehensive income (loss) before reclassifications	283		3,755	433	4,952
Amounts reclassified from AOCL	0		0	0	0
Other comprehensive income, net of tax	283		3,755	433	4,952
Reclassification of stranded tax effects to retained earnings				0
Ending Balance	547	264	(23,608)	547	(23,608)
Other
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	0	0	(7,965)	0	(5,672)
Other comprehensive income (loss) before reclassifications	0		586	0	(1,707)
Amounts reclassified from AOCL	0		9,743	0	9,743
Other comprehensive income, net of tax	0		10,329	0	8,036
Reclassification of stranded tax effects to retained earnings				0
Ending Balance	0	0	2,364	0	2,364
Total
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(125,993)	(106,923)	(161,391)	(106,923)	(161,573)
Other comprehensive income (loss) before reclassifications	283		4,341	433	3,245
Amounts reclassified from AOCL	969		11,174	6,593	12,452
Other comprehensive income, net of tax	1,252		15,515	7,026	15,697
Reclassification of stranded tax effects to retained earnings				(24,844)
Ending Balance	$ (124,741)	$ (125,993)	$ (145,876)	$ (124,741)	$ (145,876)

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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