Stock Incentive Plans - Summary of Restricted Stock Activity (Details) - Restricted Stock $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
Number of Restricted Stock
Outstanding, as of beginning of period (in shares) | shares	1,293
Granted (in shares) | shares	607
Forfeited (in shares) | shares	(117)
Vested (in shares) | shares	(204)
Outstanding, as of end of period (in shares) | shares	1,579
Weighted Average Grant Date Fair Value
Outstanding, as of beginning of period (in dollars per share) | $ / shares	$ 20.89
Granted (in dollars per share) | $ / shares	22.27
Forfeited/Canceled (in dollars per share) | $ / shares	21.69
Vested (in dollars per share) | $ / shares	21.27
Outstanding, as of end of period (in dollars per share) | $ / shares	$ 21.31
Vested, total intrinsic value of restricted stock vested | $	$ 4,874