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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, 2016
Dec. 31, 2015
Shares    
Options outstanding, Beginning Balance, Shares 749  
Options granted (in shares) 295  
Options exercised, Shares (108)  
Options forfeited/canceled/expired, Shares (62)  
Options outstanding, Ending Balance, Shares 874 749
Options vested and expected to vest, ending balance, Shares 827  
Options exercisable, ending balance, Shares 469  
Wtd. Avg. Exercise Price    
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) 21.25  
Options forfeited/canceled/expired, Wtd. Avg. Exercise Price (in dollars per share) 34.84  
Options outstanding, Ending Balance, Wtd. Avg. Exercise Price (in dollars per share) 30.50 $ 29.98
Options vested and expected to vest, ending balance, Wtd. Avg. Exercise Price (in dollars per share) 30.33  
Options exercisable, ending balance, Wtd. Avg. Exercise Price (in dollars per share) $ 27.37  
Options, Additional Disclosures    
Options outstanding, Remaining Contractual Term 7 years 2 months 16 days 6 years 10 months 6 days
Options vested and expected to vest, ending balance, Wtd. Avg., Remaining Contractual Term 7 years 1 month 10 days  
Options exercisable, ending balance, Wtd. Avg. Remaining Contractual Term 5 years 10 months 2 days  
Options outstanding, Aggregate Intrinsic Value $ 876 $ 3,057
Options vested and expected to vest, ending balance, Aggregate Intrinsic Value 876  
Options exercisable, ending balance, Aggregate Intrinsic Value $ 876