Stock Incentive Plans - Summary of Restricted Stock Activity (Details) - 6 months ended Jun. 30, 2015 - Restricted Stock - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Total
Number of Restricted Stock
Outstanding, as of beginning of period (in shares)	982
Granted (in shares)	519
Forfeited (in shares)	(32)
Vested (in shares)	(107)
Outstanding, as of end of period (in shares)	1,362
Weighted Average Grant Date Fair Value
Outstanding, as of beginning of period (in dollars per share)	$ 18.55
Granted (in dollars per share)	23.83
Forfeited/Canceled (in dollars per share)	19.43
Vested (in dollars per share)	17.52
Outstanding, as of end of period (in dollars per share)	$ 20.61
Vested, total intrinsic value of restricted stock vested	$ 2,509