Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Taxes
Income tax benefit (expense)	$ (6,975,000)	$ 47,378,000	$ (8,072,000)	$ 51,766,000
Effective Income Tax Rate, Continuing Operations	47.50%	50.10%	25.10%	26.70%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%
Valuation Allowance, Deferred Tax Asset, Change in Amount			$ 3,000,000