Stock Incentive Plans - Summary of Restricted Stock Activity (Details) - Restricted Stock $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Number of Restricted Stock
Outstanding, as of beginning of period (in shares) | shares	982
Granted (in shares) | shares	533
Forfeited (in shares) | shares	(59)
Vested (in shares) | shares	(145)
Outstanding, as of end of period (in shares) | shares	1,311
Weighted Average Grant Date Fair Value
Outstanding, as of beginning of period (in dollars per share)	$ 18.55
Granted (in dollars per share)	23.92
Forfeited/Canceled (in dollars per share)	19.37
Vested (in dollars per share)	18.08
Outstanding, as of end of period (in dollars per share)	$ 20.73
Vested, total intrinsic value of restricted stock vested | $	$ 3,484