Comprehensive Income (Changes in Accumulated Other Comprehensive Loss by Component) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 112,143	$ 837,656	$ 551,519
Other comprehensive income (loss) before reclassifications	3,455
Amounts reclassified from accumulated other comprehensive loss	(2,702)
Other comprehensive income	753	1,478	3,027
Ending balance	547,257	112,143	837,656
Foreign currency
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(2,946)
Other comprehensive income (loss) before reclassifications	0
Amounts reclassified from accumulated other comprehensive loss	0
Other comprehensive income	0
Ending balance	(2,946)	(2,946)
Unrealized loss on available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(18)
Other comprehensive income (loss) before reclassifications	16
Amounts reclassified from accumulated other comprehensive loss	0
Other comprehensive income	16
Ending balance	(2)	(18)
Unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	3,562
Other comprehensive income (loss) before reclassifications	(1,459)
Amounts reclassified from accumulated other comprehensive loss	(2,702)
Other comprehensive income	(4,161)
Ending balance	(599)	3,562
Other comprehensive (loss) gain on pension liability
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(4,247)
Other comprehensive income (loss) before reclassifications	4,898
Amounts reclassified from accumulated other comprehensive loss	0
Other comprehensive income	4,898
Ending balance	651	(4,247)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(3,649)	(5,127)	(8,154)
Other comprehensive income	753	1,478	3,027
Ending balance	$ (2,896)	$ (3,649)	$ (5,127)