Income Taxes (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Effective tax rate	30.50%	31.00%
Unrecognized tax benefits			$ 31,000,000
Unrecognized tax benefits adjusted			27,800,000
Amount of unrecognized tax benefits where significant change is reasonably possible	0		5,600,000
Accrued income tax interest and penalties			$ 6,200,000