Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021		Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	$ 595,970	$ 584,250	$ 675,460	$ 697,480	$ 584,250		$ 697,480
Total other comprehensive income (loss)	990	630	(660)	(3,680)	1,620		(4,340)
Balances	597,600	595,970	661,100	675,460	597,600		661,100
Other Comprehensive Income (Loss), Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax					(1,100)		800
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		(8,620)		(9,930)	(8,620)		(9,930)
Net unrealized gains (losses) arising during the period					0		0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax					(310)	[1]	(310)	[2]
Total other comprehensive income (loss)					310		310
Balances	(8,310)		(9,620)		(8,310)		(9,620)
Accumulated Net Gain (Loss) from Hedges Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances		(3,580)		4,230	(3,580)		4,230
Net unrealized gains (losses) arising during the period					3,330	[3]	2,300	[4]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax					0		0
Total other comprehensive income (loss)					3,330		2,300
Balances	(250)		6,530		(250)		6,530
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances		6,580		(300)	6,580		(300)
Net unrealized gains (losses) arising during the period					(2,020)		(6,950)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax					0		0
Total other comprehensive income (loss)					(2,020)		(6,950)
Balances	4,560		(7,250)		4,560		(7,250)
Accumulated Other Comprehensive Income [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	(4,990)	(5,620)	(9,680)	(6,000)	(5,620)		(6,000)
Net unrealized gains (losses) arising during the period					1,310		(4,650)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax					(310)		(310)
Total other comprehensive income (loss)	990	630	(660)	(3,680)	1,620		(4,340)
Balances	$ (4,000)	$ (4,990)	$ (10,340)	$ (9,680)	$ (4,000)		$ (10,340)

[1] Defined benefit plans, net of income tax of approximately $0.1 million. See Note 17, "Defined Benefit Plans," for further details.

[2] Defined benefit plans, net of income tax of approximately $0.1 million. See Note 17, "Defined Benefit Plans," for further details.

[3] Derivative instruments, net of income tax of approximately $1.1 million. See Note 10, "Derivative Instruments," for further details

[4] Derivative instruments, net of income tax of approximately $0.8 million. See Note 10, "Derivative Instruments," for further details.