Stock Options and Restricted Stock - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Options
Beginning Balance (In Shares)	872
Granted (In Shares)	634	338	351
Exercised (In Shares)	(35)
Forfeited/expired (In Shares)	(64)
Ending Balance (In Shares)	1,407	872
Expected to Vest (In Shares)	818
Exercisable (In Shares)	490
Weighted Average Exercise Price
Beginning Balance (in dollars per share)	$ 25.05
Granted (in dollars per share)	22.64
Exercised (in dollars per share)	15.47
Forfeited/expired (in dollars per share)	24.96
Ending Balance (in dollars per share)	24.21	$ 25.05
Expected to Vest (in dollars per share)	25.01
Exercisable (in dollars per share)	$ 22.73
Weighted Average Remaining Contractual Term (in Years)
Outstanding	7 years 6 months 7 days
Expected to Vest	8 years 9 months
Exercisable	5 years 2 months 16 days
Aggregate Intrinsic Value
Outstanding	$ 10,945
Expected	5,710
Exercisable	$ 4,541
Weighted Average Fair Value
Outstanding (in dollars per share)	$ 7.81
Expected to Vest (in dollars per share)	7.77
Exercisable (in dollars per share)	$ 7.92