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Equity Incentive Plans (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Summary of the activity of stock option awards    
Options outstanding, Beginning Balance, Shares 664  
Options outstanding, Beginning Balance, Wtd. Avg. Exercise Price $ 23.89  
Options outstanding, Beginning Balance, Wtd. Avg., Remaining Contractual Term 7 years 14 days 6 years 9 months 7 days
Options outstanding, Beginning Balance, Aggregate Intrinsic Value $ 10,935  
Options granted, Shares 256  
Options granted, Wtd. Avg. Exercise Price $ 43.15  
Options exercised, Shares (109)  
Options exercised, Wtd. Avg. Exercise Price $ 22.63  
Options forfeited/canceled/expired, Shares (35)  
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price $ 37.76  
Options outstanding, Ending Balance, Shares 776 664
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price $ 29.90 $ 23.89
Options outstanding, Ending Balance, Wtd. Avg., Remaining Contractual Term 7 years 14 days 6 years 9 months 7 days
Options outstanding, Ending Balance, Aggregate Intrinsic Value $ 3,506 $ 10,935
Options vested and expected to vest at September 30, 2015, Shares 737  
Options vested and expected to vest at September 30, 2015, Wtd. Avg. Exercise Price $ 29.41  
Options vested and expected to vest at September 30, 2015, Wtd. Avg., Remaining Contractual Term 6 years 11 months 9 days  
Options vested and expected to vest at September 30, 2015, Aggregate Intrinsic Value $ 3,498  
Options exercisable at September 30, 2015, Shares 454  
Options exercisable at September 30, 2015, Wtd. Avg. Exercise Price $ 23.98  
Options exercisable at September 30, 2015, Wtd. Avg. Remaining Contractual Term 5 years 8 months 12 days  
Options exercisable at September 30, 2015, Aggregate Intrinsic Value $ 3,390