Income Taxes (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Income tax provision	$ 10,251	$ 10,348	$ 49,837	$ 36,907
Effective tax rate	34.70%	36.50%	34.50%	37.70%