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 expense (benefit)	$ 1,284,000	$ (1,383,000)	$ 5,026,000	$ (8,181,000)
Effective tax rate (as a percent)			40.00%	43.60%
Income tax benefit related to extraterritorial income				$ 8,600,000