Income Taxes (Income Tax Provision) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ (42,718)	$ 1,079	$ (549)
State and local	(748)	1,215	323
Foreign	7,133	4,361	1,138
Total current income tax provision	(36,333)	6,655	912
Deferred:
Federal	29,158	4,409	10,073
State and local	1,127	1,925	578
Foreign	(4,211)	62	367
Total deferred income tax provision	26,074	6,396	11,018
Federal	(13,560)	5,488	9,525
State and local	379	3,140	901
Foreign	2,922	4,423	1,505
Total income tax expense	$ (10,259)	$ 13,051	$ 11,931