Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020		Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	$ 661,100	$ 675,460	$ 697,480	$ 647,360	$ 640,510	$ 620,450	$ 697,480		$ 620,450
Total other comprehensive income (loss)	1,320	(660)	(3,680)	180	(1,530)	3,020	(3,020)		1,670
Balances	557,970	661,100	675,460	662,060	647,360	640,510	557,970		662,060
Other Comprehensive Income (Loss), Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax							(700)		1,800
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			(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							(470)	[1]	(300)	[2]
Total other comprehensive income (loss)							470		300
Reclassification of stranded tax effects									(1,260)
Balances	(9,460)			(8,160)			(9,460)		(8,160)
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							(2,280)	[3]	5,750	[4]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax							0		0
Total other comprehensive income (loss)							(2,280)		5,750
Reclassification of stranded tax effects									(10)
Balances	1,950			6,680			1,950		6,680
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							(1,210)		(4,380)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax							0		0
Total other comprehensive income (loss)							(1,210)		(4,380)
Reclassification of stranded tax effects									0
Balances	(1,510)			(14,970)			(1,510)		(14,970)
Accumulated Other Comprehensive Income [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	(10,340)	(9,680)	(6,000)	(16,630)	(15,100)	(16,850)	(6,000)		(16,850)
Net unrealized gains (losses) arising during the period							(3,490)		1,370
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax							(470)		(300)
Total other comprehensive income (loss)	1,320	(660)	(3,680)	180	(1,530)	3,020	(3,020)		1,670
Reclassification of stranded tax effects									(1,270)
Balances	$ (9,020)	$ (10,340)	$ (9,680)	$ (16,450)	$ (16,630)	$ (15,100)	$ (9,020)		$ (16,450)

[1] Defined benefit plans, net of income tax of approximately $0.1 million. See Note 19, "Defined Benefit Plans," for further details.

[2] Defined benefit plans, net of income tax of approximately $0.1 million. See Note 19, "Defined Benefit Plans," for further details.

[3] Derivative instruments, net of income tax of approximately $0.7 million. See Note 12, "Derivative Instruments," for further details.

[4] Derivative instruments, net of income tax of approximately $1.8 million. See Note 12, "Derivative Instruments," for further details.