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Stock-Based Compensation, Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Stock-Based Compensation [Abstract]      
Shares, Outstanding, Beginning Balance (in shares) 3,572,116    
Shares, Granted (in shares) 199,438    
Shares, Exercised (in shares) (276,700)    
Shares, Forfeited or expired (in shares) (31,874)    
Shares, Outstanding, Ending Balance (in shares) 3,462,980   3,572,116
Shares, Exercisable (in shares) 1,898,382    
Shares, Vested and expected to vest (in shares) 3,261,836    
Weighted- Average Exercise Price, Outstanding, Beginning Balance (in dollars per share) $ 11.40    
Weighted- Average Exercise Price, Granted (in dollars per share) 32.98    
Weighted- Average Exercise Price, Exercised (in dollars per share) 2.40    
Weighted- Average Exercise Price, Forfeited or expired (in dollars per share) 22.25    
Weighted- Average Exercise Price, Outstanding, Ending Balance (in dollars per share) 13.26   $ 11.40
Weighted- Average Exercise Price, Exercisable (in dollars per share) 6.58    
Weighted- Average Exercise Price, Vested and expected to vest (in dollars per share) $ 12.89    
Weighted- Average Remaining Contractual Term, Outstanding 6 years 10 months 24 days   7 years 3 months 18 days
Weighted- Average Remaining Contractual Term, Exercisable 5 years 7 months 6 days    
Weighted- Average Remaining Contractual Term, Vested and expected to vest 6 years 10 months 24 days    
Aggregate Intrinsic Value, Outstanding, Ending Balance $ 37,397    
Aggregate Intrinsic Value, Exercisable 29,810    
Aggregate Intrinsic Value, Vested and expected to vest $ 36,179    
Weighted-average grant-date fair value of options granted (in dollars per share) $ 21.95    
Intrinsic value of options exercised $ 8,600    
Cash received for options exercised 632 $ 486  
Fair value of shares vested 4,900    
Unrecognized compensation expense related to non-vested stock-options, net of related forfeiture estimates $ 17,800    
Unrecognized compensation expense recognition period 3 years