Share-Based Compensation (Details 2) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended		0 Months Ended					3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Options	Sep. 30, 2013 Options	Sep. 30, 2014 Options	Sep. 30, 2013 Options	Sep. 30, 2014 Options Maximum	Sep. 30, 2014 Options Minimum	Sep. 30, 2014 Restricted Stock Units	Sep. 30, 2013 Restricted Stock Units	Sep. 30, 2014 Restricted Stock Units	Sep. 30, 2013 Restricted Stock Units	Jun. 11, 2014 Director Stock Option [Member]	Mar. 12, 2014 Director Stock Option [Member]	Sep. 10, 2014 Employee Stock Option [Member]	Jun. 11, 2014 Employee Stock Option [Member]	Feb. 18, 2014 Incentive Plan Chief Executive Officer [Member] Common Stock	Jun. 30, 2014 Incentive Plan Chief Executive Officer [Member] Common Stock	Jun. 30, 2013 Incentive Plan Chief Executive Officer [Member] Common Stock	Jun. 30, 2014 Incentive Plan Chief Executive Officer [Member] Common Stock	Jun. 30, 2013 Incentive Plan Chief Executive Officer [Member] Common Stock	Sep. 30, 2014 Incentive Plan Chief Executive Officer [Member] Common Stock
Shares Under Options
Outstanding at the beginning of the period (in shares)							467,500
Granted (in shares)							35,193								14,616	577	5,000	15,000
Exercised (in shares)							(162,586)
Outstanding at the end of the period (in shares)					340,107		340,107
Exercisable at the end of the period (in shares)					257,608		257,608
Vested and expected to vest at the end of the period (in shares)					340,107		340,107
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)							$ 9.00
Granted (in dollars per share)							$ 24.69									$ 25.48	$ 22.55	$ 25.04
Exercised (in dollars per share)							$ 4.36
Outstanding at the end of the period (in dollars per share)					$ 12.84		$ 12.84
Exercisable at the end of the period (in dollars per share)					$ 10.35		$ 10.35
Vested and expected to vest at the end of the period (in dollars per share)					$ 12.84		$ 12.84
Weighted Average Remaining Contractual Life
Outstanding at the end of the period							4 years 29 days
Exercisable at the end of the period							4 years 2 months 1 day
Vested and expected to vest at the end of the period							4 years 29 days
Aggregate Intrinsic Value
Outstanding at the end of the period					$ 3,204,000		$ 3,204,000
Exercisable at the end of the period					3,044,000		3,044,000
Vested and expected to vest at the end of the period					3,204,000		3,204,000
Assumptions used to determine the intrinsic fair market value of options using Black Scholes option pricing model
Expected volatility (as a percent)									37.90%	32.30%
Expected dividends (as a percent)							0.00%
Risk free interest rate (as a percent)									0.90%	0.70%
Expected term									5 years	3 years 9 months 18 days
Weighted average grant date fair value of options granted (in dollars per share)							$ 7.24
The total intrinsic value of all options exercised				2,000,000			3,400,000	2.0
Restricted Stock Units
Unvested at the beginning of the period (in shares)													50,900
Awards																			400,000					300,000
Awarded (in shares)													22,338
Shares vested (in shares)													(30,253)
Unvested at the end of the period (in shares)											42,985		42,985
Weighted Average Award Date Fair Value
Unvested at the beginning of the period (in dollars per share)													$ 11.94
Awarded (in dollars per share)													$ 25.94
Shares vested (in dollars per share)													$ 10.11
Unvested at the end of the period (in dollars per share)											$ 18.59		$ 18.59
Additional share-based compensation disclosures
Total amount of consideration received from the exercised options							709,000	334,000
Compensation expense	215,000	200,000	945,000	707,000	44,000	40,000	310,000	165,000			71,000	60,000	207,000	182,000						100,000	100,000	300,000	300,000
Net-share settlement (in shares)							17,233						9,878	37,796
Net-share settlement, market price per share													$ 25.88	$ 19.81
Unrecognized compensation expense	$ 915,000		$ 915,000								$ 915,000		$ 915,000
Weighted average period of recognition of unrecognized compensation expense													3 years 9 months
Shares surrendered in lieu of payment of exercise price and withholding taxes							32,164
Shares surrendered in lieu of payment of exercise price of awards							14,931
Average market price of shares surrendered in lieu of payment of exercise price and withholding taxes (in dollars per share)							$ 25.42