Stock Incentive Plans - Summary of Restricted Stock Activity (Details) - Restricted Stock $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) $ / shares shares
Number of Restricted Stock
Outstanding, at beginning of period (in shares) | shares	1,320
Granted (in shares) | shares	56
Forfeited (in shares) | shares	(47)
Vested (in shares) | shares	(105)
Outstanding, at end of period (in shares) | shares	1,224
Weighted Average Grant Date Fair Value
Outstanding, as of beginning of period (in dollars per share) | $ / shares	$ 24.94
Granted (in dollars per share) | $ / shares	34.04
Forfeited (in dollars per share) | $ / shares	23.03
Vested (in dollars per share) | $ / shares	24.72
Outstanding, as of end of period (in dollars per share) | $ / shares	$ 25.44
Total Intrinsic Value of Restricted Stock Vested
Vested | $	$ 3,521