Equity Incentive Plans (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Summary of the activity of stock option awards
Options outstanding, Beginning Balance, Shares	749
Options granted, Shares	295
Options exercised, Shares	(93)
Options forfeited/canceled/expired, Shares	(46)
Options outstanding, Ending Balance, Shares	905	749
Options vested and expected to vest, ending balance, Shares	848
Options exercisable, ending balance, Shares	472
Options outstanding, Beginning Balance, Wtd. Avg. Exercise Price (in dollars per share)	$ 29.98
Options granted, Wtd. Avg. Exercise Price (in dollars per share)	29.39
Options exercised, Wtd. Avg. Exercise Price (in dollars per share)	21.20
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price (in dollars per share)	35.14
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price (in dollars per share)	30.42	$ 29.98
Options vested and expected to vest, ending balance, Wtd. Avg. Exercise Price (in dollars per share)	30.23
Options exercisable, ending balance, Wtd. Avg. Exercise Price (in dollars per share)	$ 27.45
Options outstanding, Remaining Contractual Term	7 years 5 months 12 days	6 years 10 months 6 days
Options vested and expected to vest, ending balance, Wtd. Avg., Remaining Contractual Term	7 years 4 months 2 days
Options exercisable, ending balance, Wtd. Avg. Remaining Contractual Term	6 years 1 month 2 days
Options outstanding, Aggregate Intrinsic Value	$ 5,323	$ 3,057
Options vested and expected to vest, ending balance, Aggregate Intrinsic Value	5,136
Options exercisable, ending balance, Aggregate Intrinsic Value	$ 3,955