Income Taxes (Summary of Income Tax Benefit (Provision)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Current:
U.S. Federal	$ (2,918)	$ 47,761
State and local	2	867
Foreign	(250)	(250)
Total current	(3,166)	48,378
Deferred:
U.S. Federal	(2,990)	(9,036)
State and local	3	6
Total deferred	(2,987)	(9,030)
Income tax benefit (provision)	$ (6,153)	$ 39,348