Equity Incentive Plans (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Summary of the activity of stock option awards
Options outstanding, Beginning Balance, Shares	749
Options outstanding, Beginning Balance, Wtd. Avg. Exercise Price	$ 29.98
Options outstanding, Beginning Balance, Wtd. Avg., Remaining Contractual Term	7 years 7 months 2 days	6 years 10 months 6 days
Options outstanding, Beginning Balance, Aggregate Intrinsic Value	$ 3,057
Options granted, Shares	295
Options granted, Wtd. Avg. Exercise Price	$ 29.39
Options exercised, Shares	(50)
Options exercised, Wtd. Avg. Exercise Price	$ 19.57
Options forfeited/canceled/expired, Shares	(22)
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price	$ 35.62
Options outstanding, Ending Balance, Shares	972	749
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price	$ 30.22	$ 29.98
Options outstanding, Ending Balance, Wtd. Avg., Remaining Contractual Term	7 years 7 months 2 days	6 years 10 months 6 days
Options outstanding, Ending Balance, Aggregate Intrinsic Value	$ 6,226	$ 3,057
Options vested and expected to vest, ending balance, Shares	905
Options vested and expected to vest, ending balance, Wtd. Avg. Exercise Price	$ 29.98
Options vested and expected to vest, ending balance, Wtd. Avg., Remaining Contractual Term	7 years 5 months 19 days
Options vested and expected to vest, ending balance, Aggregate Intrinsic Value	$ 5,981
Options exercisable, ending balance, Shares	521
Options exercisable, ending balance, Wtd. Avg. Exercise Price	$ 27.24
Options exercisable, ending balance, Wtd. Avg. Remaining Contractual Term	6 years 3 months 11 days
Options exercisable, ending balance, Aggregate Intrinsic Value	$ 4,644