Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019		Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	$ 620,450		$ 544,020
Total other comprehensive income (loss)	3,020		(1,480)
Balances	640,510		565,780
Other Comprehensive Income (Loss), Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(700)		1,200
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax			100
Defined Benefit Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	(7,200)		(10,450)
Net unrealized gains (losses) arising during the period	0		0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(100)		(200)	[1]
Total other comprehensive income (loss)	100		200
Reclassification of stranded tax effects	(1,260)
Balances	(8,360)		(10,250)
Accumulated Net Gain (Loss) from Hedges Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	940		(3,170)
Net unrealized gains (losses) arising during the period	2,220	[2]	(4,040)	[3]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0		0
Total other comprehensive income (loss)	2,220		(4,040)
Reclassification of stranded tax effects	(10)
Balances	3,150		(7,210)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	(10,590)		(3,710)
Net unrealized gains (losses) arising during the period	700		2,360
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0		0
Total other comprehensive income (loss)	700		2,360
Reclassification of stranded tax effects	0
Balances	(9,890)		(1,350)
Accumulated Other Comprehensive Income [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	(16,850)		(17,330)
Net unrealized gains (losses) arising during the period	2,920		(1,680)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(100)		(200)
Total other comprehensive income (loss)	3,020		(1,480)
Reclassification of stranded tax effects	(1,270)
Balances	$ (15,100)		$ (18,810)

[1] Defined benefit plans, net of income tax of approximately $0.1 million. See Note 15, "Defined Benefit Plans," for further details.

[2] Derivative instruments, net of income tax of approximately $0.7 million. See Note 9, "Derivative Instruments," for further details.

[3] Derivative instruments, net of income tax of approximately $1.2 million. See Note 9, "Derivative Instruments," for further details.