Income Taxes (Details) - Income Before Income Tax Provision (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Domestic									$ 64,238	$ 64,281	$ 61,983
International									44	14	86
Total income before income tax provision	$ 16,247	$ 17,258	$ 14,965	$ 15,812	$ 10,945	$ 13,260	$ 16,988	$ 23,102	$ 64,282	$ 64,295	$ 62,069