Share-Based Compensation - Schedule of Stock Option Activity (Details) - Stock Options - 2012 Plan $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning balance (in shares)	1,124,600
Exercised (in shares)	(25,900)
Outstanding, ending balance (in shares)	1,098,700
Exercisable (in shares)	1,098,700
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 18.84
Exercised (in dollars per share) | $ / shares	20.13
Outstanding, ending balance (in dollars per share) | $ / shares	18.81
Exercisable (in dollars per share) | $ / shares	$ 18.81
Weighted Average Contractual Life [Abstract]
Outstanding weighted average contractual life	3 years 9 months 12 days
Exercisable weighted average contractual life	3 years 9 months
Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Aggregate Intrinsic Value [Abstract]
Outstanding aggregate intrinsic value | $	$ 17,125
Exercisable intrinsic value | $	$ 17,125