Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Amounts reclassified from AOCL	$ 1,591	$ 969	$ 2,660	$ 6,593
Other comprehensive income, net of tax	1,238	1,252	2,317	7,026
Retirement Plans
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(135,824)	(126,257)	(136,893)	(107,037)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from AOCL	1,591	969	2,660	6,593
Other comprehensive income, net of tax	1,591	969	2,660	6,593
Reclassification of stranded tax effects to retained earnings				(24,844)
Ending Balance	(134,233)	(125,288)	(134,233)	(125,288)
Foreign Currency Translation
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	392	264	382	114
Other comprehensive income (loss) before reclassifications	(353)	283	(343)	433
Amounts reclassified from AOCL	0	0	0	0
Other comprehensive income, net of tax	(353)	283	(343)	433
Reclassification of stranded tax effects to retained earnings				0
Ending Balance	39	547	39	547
Total
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(135,432)	(125,993)	(136,511)	(106,923)
Other comprehensive income (loss) before reclassifications	(353)	283	(343)	433
Amounts reclassified from AOCL	1,591	969	2,660	6,593
Other comprehensive income, net of tax	1,238	1,252	2,317	7,026
Reclassification of stranded tax effects to retained earnings				(24,844)
Ending Balance	$ (134,194)	$ (124,741)	$ (134,194)	$ (124,741)

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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