Income Taxes (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Taxes
Income tax expense (benefit)	$ (1,383,000)		$ (3,486,000)	$ (8,181,000)	$ 405,000
Effective tax rate (as a percent)				43.60%	149.40%
Income tax benefit related to extraterritorial income		8,600,000
Tax benefit due to debt extinguishment and derivative termination					$ 5,300,000