Stockholders' Equity (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 1,381,008	$ 1,092,875	$ 908,326
Net foreign currency translation adjustment	8,532	(20,920)	(9,697)
Actuarial (loss) gain on pension plans	(964)	28,125	2,107
Net current-period other comprehensive income (loss)	7,568	7,205
Ending Balance	1,355,036	1,381,008	1,092,875
Accumulated Other Comprehensive (Loss) Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	6,704	(501)	7,089
Ending Balance	14,272	6,704	(501)
Foreign currency items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(23,321)	(2,401)
Net foreign currency translation adjustment	8,532	(20,920)
Actuarial (loss) gain on pension plans	0	0
Net current-period other comprehensive income (loss)	8,532	(20,920)
Ending Balance	(14,789)	(23,321)	(2,401)
Pension items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	30,025	1,900
Net foreign currency translation adjustment	0	0
Actuarial (loss) gain on pension plans	(964)	28,125
Net current-period other comprehensive income (loss)	(964)	28,125
Ending Balance	$ 29,061	$ 30,025	$ 1,900