Income Taxes (Details 1) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
U.S. federal, state and local - current									$ (8,491,000)	$ 9,037,000	$ 952,000
Foreign - current									4,881,000	3,326,000	5,512,000
(Reduction in) tax benefit on stock based compensation - federal, state and local									0	(4,427,000)	6,212,000
Total current tax expense (benefit)									(3,610,000)	7,936,000	12,676,000
Deferred:
U.S. federal, state and local - deferred									0	(708,160,000)	245,005,000
Foreign - deferred									(6,000)	11,000	(11,000)
Total deferred tax expense (benefit)									(6,000)	(708,149,000)	244,994,000
Total income tax(benefit) provision	$ (6,856,000)	$ 381,000	$ 1,491,000	$ 1,368,000	$ 8,765,000	$ 175,000	$ (754,642,000)	$ 45,489,000	$ (3,616,000)	$ (700,213,000)	$ 257,670,000