Income Taxes (Schedule of Provision for Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ (4,500)	$ 47,300	$ 77,000
State and local	3,300	6,600	10,900
Total current income tax expense	8,200	57,800	89,600
Deferred:
Federal	25,700	14,900	500
Foreign	(19,900)	2,700	(1,500)
State and local	(2,000)	1,000	3,900
Total deferred income tax expense	3,925	13,756	6,533
Provision for income taxes	11,957	76,429	92,542
Foreign	9,400	3,900	1,700
Continuing Operations [Member]
Deferred:
Total deferred income tax expense	$ 3,800	$ 18,600	$ 2,900