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Stock-based Compensation and Other Employee Benefit Plans RSU and RSAs (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 148,434      
Award with service conditions [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Unvested RSUs and RSAs outstanding at January 1 (in shares) 207,771      
Granted (in shares) 343,912      
Vested (in shares) (110,500)      
Forfeited (in shares) (16,502)      
Unvested RSUs and RSAs outstanding at December 31 (in shares) 424,681 207,771    
Unvested and expected to vest RSUs and RSAs outstanding at December 31 (in shares) 361,250      
Awards with performance and service conditions [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Unvested RSUs and RSAs outstanding at January 1 (in shares) 652,202      
Granted (in shares) 389,480      
Vested (in shares) (107,941)      
Forfeited (in shares) (40,475)      
Unvested RSUs and RSAs outstanding at December 31 (in shares) 893,266 652,202    
Unvested and expected to vest RSUs and RSAs outstanding at December 31 (in shares) 859,007      
Restricted Stock Units and Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 927,572      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]        
Unvested RSUs and RSAs outstanding at January 1 (in shares) 859,973      
Granted (in shares) 733,392      
Vested (in shares) (218,441)      
Forfeited (in shares) (56,977)      
Unvested RSUs and RSAs outstanding at December 31 (in shares) 1,317,947 859,973    
Unvested and expected to vest RSUs and RSAs outstanding at December 31 (in shares) 1,220,257      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]        
Unvested RSUs and RSAs outstanding at January 1, weighted average grant date fair value (in dollars per share) $ 44.29      
Granted, weighted average grant date fair value (in dollars per share) 74.61 $ 49.62 $ 36.07  
Vested, weighted average grant date fair value (in dollars per share) $ 43.71      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures 53.23      
Unvested RSUs and RSAs outstanding at December 31, weighted average grant date fair value (in dollars per share) $ 60.87 $ 44.29    
Unvested and expected to vest RSUs and RSAs outstanding at December 31, weighted average grant date fair value (in dollars per share) $ 60.49      
Liability Award [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent $ 497 $ 0 $ 465 $ 0