Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020		Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	$ 697,480		$ 620,450
Total other comprehensive income (loss)	(3,680)		3,020
Balances	675,460		640,510
Other Comprehensive Income (Loss), Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(1,500)		700
Defined Benefit Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	(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	(150)		(100)
Total other comprehensive income (loss)	150		100
Reclassification of stranded tax effects			(1,260)
Balances	(9,780)		(8,360)
Accumulated Net Gain (Loss) from Hedges Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	4,230		940
Net unrealized gains (losses) arising during the period	4,430	[1]	2,220	[2]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0		0
Total other comprehensive income (loss)	4,430		2,220
Reclassification of stranded tax effects			(10)
Balances	8,660		3,150
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	(300)		(10,590)
Net unrealized gains (losses) arising during the period	(8,260)		700
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0		0
Total other comprehensive income (loss)	(8,260)		700
Reclassification of stranded tax effects			0
Balances	(8,560)		(9,890)
Accumulated Other Comprehensive Income [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balances	(6,000)		(16,850)
Net unrealized gains (losses) arising during the period	(3,830)		2,920
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(150)		(100)
Total other comprehensive income (loss)	(3,680)		3,020
Reclassification of stranded tax effects			(1,270)
Balances	$ (9,680)		$ (15,100)

[1] Derivative instruments, net of income tax of approximately $1.5 million. See Note 10, "Derivative Instruments," for further details.

[2] Derivative instruments, net of income tax of approximately $0.7 million. See Note 10, "Derivative Instruments," for further details.