Income Taxes (Details Textual) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Effective tax rate	32.10%	32.50%	31.60%	32.00%
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		0		5,600,000
Accrued income tax interest and penalties					$ 6,200,000