Equity-Based Compensation (Details 3) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Equity-based compensation
Cash received related to exercise of stock options			$ 2,032,000	$ 54,000
Excess tax benefit realized on exercise of stock options and delivery of vested restricted stock units			$ 2,411,000
Additional shares available to grant under plan (in shares)	1,930,704		1,930,704
Restricted Stock Units (RSUs)
Equity-based compensation
Excess tax benefit realized on exercise of stock options and delivery of vested restricted stock units			$ 2,411,000
Restricted Stock Units, Unvested	111,988		111,988
Equity-based compensation (in dollars)	$ 430,000	$ 200,000	$ 1,098,000	$ 532,000
Estimated value of withheld shares			$ 88,000
President Emeritus [Member] | Restricted Stock Units (RSUs)
Equity-based compensation
Restricted Stock Units, Unvested	7,576		7,576
Equity-based compensation (in dollars)	$ 109,000		$ 216,000