Equity and Accumulated Other Comprehensive Loss (Changes in Accumulated Other Comprehensive Loss by Component) (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		Dec. 31, 2019	Dec. 31, 2018
Equity and Accumulated Other Comprehensive Loss [Abstract]
Foreign currency translation, Beginning balance	$ (106,770)			$ (91,472)	$ (87,537)			$ (86,044)	$ (91,472)		$ (86,044)
Foreign currency translation, Other comprehensive income (loss) before reclassifications	5,975				(11,727)				(9,323)		(13,220)
Foreign currency translation, Net other comprehensive income (loss), net of tax	5,975				(11,727)				(9,323)		(13,220)
Foreign currency translation, Ending balance	(100,795)		$ (106,770)		(99,264)		$ (87,537)		(100,795)		(99,264)
Unrealized gain (loss) on on derivatives, Beginning balance	(2,445)				222			292			292
Unrealized gain (loss) on on derivatives, Other comprehensive income (loss) before reclassifications	505				(23)				(2,905)		313
Unrealized gain (loss) on on derivatives, Amounts reclassified from accumulated other comprehensive loss	517				(103)				1,482		(509)
Unrealized gain (loss) on on derivatives, Net other comprehensive income (loss), net of tax	1,022	[1]	1,210	$ (3,655)	(126)	[1]	(112)	$ 42	(1,423)	[1]	(196)	[1]
Unrealized gain (loss) on on derivatives, Ending balance	(1,423)		(2,445)		96		222		(1,423)		96
Total, Other comprehensive income (loss) before reclassifications	6,480				(11,750)				(12,228)		(12,907)
Total, Amounts reclassified from accumulated other comprehensive loss	517				(103)				1,482		(509)
Total, Net other comprehensive income (loss), net of tax	6,997				(11,853)				(10,746)		(13,416)
Accumulated other comprehensive income (loss), net of tax, total	$ (102,218)		$ (109,215)		$ (99,168)		$ (87,315)		$ (102,218)		$ (99,168)		$ (91,472)	$ (85,752)

[1] Net of tax expense (benefit) of $272 and $(34) for the three months ended September 30, 2020 and 2019, respectively. Net of tax benefit of $(378) and $(53) for the nine months ended September 30, 2020 and 2019, respectively.