Share-Based Compensation - Summary of Non-vested Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) - 2012 Plan	9 Months Ended
	Sep. 30, 2015 $ / shares shares
2012 Plan Restricted Stock Units [Roll Forward]
Outstanding, beginning balance (in shares)	279,000
Granted (in shares)	124,700
Vested (in shares)	(106,400)
Canceled (in shares)	(25,400)
Outstanding, ending balance (in shares)	271,900
Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 33.76
Granted (in dollars per share) | $ / shares	40.85
Vested (in dollars per share) | $ / shares	31.58
Canceled (in dollars per share) | $ / shares	35.15
Outstanding, ending balance (in dollars per share) | $ / shares	$ 37.74