Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Income or Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ 766,573	$ 635,786	$ 584,582
Other comprehensive income (loss) before reclassifications	(11,986)	28,457
Actuarial net loss incurred in the fiscal year	(1,678)	(1,481)
Amounts reclassified from accumulated other comprehensive loss	(15)	131
Net current-period other comprehensive income (loss)	(13,679)	27,107
Ending Balance	848,324	766,573	635,786
AOCI, Pension and other postretirement benefit plans, tax	9,984	9,563	9,160
AOCI, cumulative changes in net gain (loss) from cash flow hedges, tax	106	15	0
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(17,983)	(46,446)
Other comprehensive income (loss) before reclassifications	(12,505)	28,463	(5,081)
Actuarial net loss incurred in the fiscal year	0	0
Amounts reclassified from accumulated other comprehensive loss	0	0
Net current-period other comprehensive income (loss)	(12,505)	28,463
Ending Balance	(30,488)	(17,983)	(46,446)
Accumulated Other Comprehensive Income (Loss) Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(47,198)	(45,816)
Other comprehensive income (loss) before reclassifications	0	0
Actuarial net loss incurred in the fiscal year	(1,678)	(1,481)	1,106
Amounts reclassified from accumulated other comprehensive loss	176	99	160
Net current-period other comprehensive income (loss)	(1,502)	(1,382)
Ending Balance	(48,700)	(47,198)	(45,816)
Derivative Instruments Designated as Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	26	0
Other comprehensive income (loss) before reclassifications	519	(6)	0
Actuarial net loss incurred in the fiscal year	0	0
Amounts reclassified from accumulated other comprehensive loss	(191)	32
Net current-period other comprehensive income (loss)	328	26
Ending Balance	354	26	0
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(65,155)	(92,262)	(88,458)
Ending Balance	$ (78,834)	$ (65,155)	$ (92,262)

Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax

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Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax

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Accumulated Other Comprehensive Income (Loss) [Roll Forward]

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

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

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