Income Taxes (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Effective tax rate (percent)	32.00%	30.50%
Unrecognized tax benefits			$ 31,600,000
Unrecognized tax benefits adjusted			28,200,000
Amount of unrecognized tax benefits where significant change is reasonably possible	0		4,400,000
Accrued income tax interest and penalties			$ 5,700,000