Stock Options, Employee Stock Purchase Plan and Restricted Stock - Non-vested Restricted Stock Activity (Details) - Restricted stock units shares in Thousands	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Number of Units
Non-vested shares, beginning balance (in Shares) | shares	416
Granted (in Shares) | shares	0
Vested (in Shares) | shares	0
Forfeited (in Shares) | shares	(6)
Non-vested shares, ending balance (in Shares) | shares	410
Weighted Average Per Share Grant Date Fair Value
Weighted average grant date fair value, beginning balance (in Dollars per share) | $ / shares	$ 31.52
Granted (in Dollars per share) | $ / shares	0.00
Vested (in Dollars per share) | $ / shares	0.00
Forfeited (in Dollars per share) | $ / shares	29.50
Weighted average grant date fair value, ending balance (in Dollars per share) | $ / shares	$ 31.55