Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020		Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	$ 675,460	$ 697,480	$ 640,510	$ 620,450	$ 697,480		$ 620,450
Total other comprehensive income (loss)	(660)	(3,680)	(1,530)	3,020	(4,340)		1,490
Balances	661,100	675,460	647,360	640,510	661,100		647,360
Other Comprehensive Income (Loss), Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax					(800)		500
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax					100		100
Defined Benefit Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances		(9,930)		(7,200)	(9,930)		(7,200)
Net unrealized gains (losses) arising during the period					0		0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax					(310)	[1]	(200)	[2]
Total other comprehensive income (loss)					310		200
Reclassification of stranded tax effects							(1,260)
Balances	(9,620)		(8,260)		(9,620)		(8,260)
Accumulated Net Gain (Loss) from Hedges Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances		4,230		940	4,230		940
Net unrealized gains (losses) arising during the period					2,300	[3]	1,490	[4]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax					0		0
Total other comprehensive income (loss)					2,300		1,490
Reclassification of stranded tax effects							(10)
Balances	6,530		2,420		6,530		2,420
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances		(300)		(10,590)	(300)		(10,590)
Net unrealized gains (losses) arising during the period					(6,950)		(200)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax					0		0
Total other comprehensive income (loss)					(6,950)		(200)
Reclassification of stranded tax effects							0
Balances	(7,250)		(10,790)		(7,250)		(10,790)
Accumulated Other Comprehensive Income [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	(9,680)	(6,000)	(15,100)	(16,850)	(6,000)		(16,850)
Net unrealized gains (losses) arising during the period					(4,650)		1,290
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax					(310)		(200)
Total other comprehensive income (loss)	(660)	(3,680)	(1,530)	3,020	(4,340)		1,490
Reclassification of stranded tax effects							(1,270)
Balances	$ (10,340)	$ (9,680)	$ (16,630)	$ (15,100)	$ (10,340)		$ (16,630)

[1] Defined benefit plans, net of income tax of approximately $0.1 million. See Note 18, "Defined Benefit Plans," for further details.

[2] Defined benefit plans, net of income tax of approximately $0.1 million. See Note 18, "Defined Benefit Plans," for further details.

[3] Derivative instruments, net of income tax of approximately $0.8 million. See Note 11, "Derivative Instruments," for further details.

[4] Derivative instruments, net of income tax of approximately $0.5 million. See Note 11, "Derivative Instruments," for further details.