Income Taxes (Schedule of Components of Provision for Income Taxes) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
Current federal	$ 77,000,000	$ 48,700,000	$ 21,900,000
Current foreign	1,700,000	300,000	100,000
Current state and local	10,900,000	12,400,000	1,300,000
Total current income tax expense	89,600,000	61,400,000	23,300,000
Deferred:
Deferred federal	500,000	15,200,000	35,000,000
Deferred foreign	(1,500,000)	1,100,000	(1,700,000)
Deferred state and local	3,900,000	(1,600,000)	5,200,000
Total deferred income tax expense	6,533,000	5,127,000	40,280,000
Provision for income taxes	92,542,000	76,080,000	61,824,000
Continuing Operations [Member]
Deferred:
Total deferred income tax expense	$ 2,900,000	$ 14,700,000	$ 38,500,000