Stock Options, Employee Stock Purchase Plan and Restricted Stock - Stock Option Activity (Details) - 2014 and 2003 Stock Option Plan - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Number of Options
Options outstanding, beginning balance (in Shares)	4,766
Granted (in Shares)	66
Exercised (in Shares)	(88)
Forfeited (in Shares)	(38)
Options outstanding, ending balance (in Shares)	4,706	4,766
Options, exercisable (in Shares)	1,688
Weighted Average Exercise Price
Weighted average exercise price, beginning balance (in Dollars per share)	$ 27.27
Granted (in Dollars per share)	21.28
Exercised (in Dollars per share)	12.68
Forfeited (in Dollars per share)	31.83
Weighted average exercise price, ending balance (in Dollars per share)	27.43	$ 27.27
Weighted average exercise price, exercisable (in Dollars per share)	$ 25.09
Weighted Average Remaining Contractual Term	4 years 10 months 20 days	5 years 11 days
Weighted Average Remaining Contractual Term, exercisable	3 years 5 months 15 days
Aggregate Intrinsic Value	$ 7,034	$ 5,714
Aggregate Intrinsic Value, exercisable	$ 5,800