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Stock-Based Compensation - NSOs (Details) - NSOs - USD ($)
$ / shares in Units, shares in Thousands, $ 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, Options, Outstanding [Roll Forward]        
Outstanding, shares 2,431 [1] 2,847 [1] 2,396 1,375
Outstanding, Weighted Average Exercise Price $ 36.54 [1] $ 39.00 [1] $ 45.82 [1] $ 60.62
Outstanding, Weighted Average Fair Value $ 12.79 [1] $ 15.49 [1] $ 19.15 [1] $ 30.47
Outstanding, Weighted Average Remaining Contractual Term (in years) 7 years 20 days [1] 6 years 6 months 26 days [1] 8 years 2 months 12 days [1] 8 years 3 months 15 days
Outstanding, Aggregate Intrinsic Value $ 25,908 [1] $ 21,897 [1] $ 6,163 [1] $ 0
Grants in period, shares 202 932 1,363  
Grants in period, Weighted Average Exercise Price $ 42.85 $ 32.12 $ 30.43  
Grants in period, Weighted Average Fair Value $ 11.33 $ 7.97 $ 7.46  
Cancelled in period, shares (504) (87) (67)  
Cancelled in period, Weighted Average Exercise Price $ 54.57 $ 48.48 $ 60.45  
Cancelled in Period, Weighted Average Fair Value $ 28.53 $ 23.91 $ 30.55  
Forfeitures in period, shares (49) (447) (275)  
Forfeitures in period, Weighted Average Exercise Price $ 30.04 $ 29.24 $ 39.89  
Forfeitures in period, Weighted Average Fair Value $ 8.05 $ 8.31 $ 15.04  
Exercised in period, shares (65) (400)    
Exercised in period, Weighted Average Exercise Price $ 28.62 $ 28.31    
Exercised in period, Weighted Average Fair Value $ 7.92 $ 8.54    
Adjustment due to Special Cash Dividend, shares   453    
Vested and exercisable, shares [1] 1,270      
Vested and exercisable, Weighted Average Exercise Price [1] $ 40.43      
Vested and exercisable, Weighted Average Fair Value [1] $ 16.60      
Vested and exercisable, Weighted Average Remaining Contractual Term (in years) [1] 6 years 3 months 25 days      
Vested and exercisable, Aggregate Intrinsic Value [1] $ 10,682      
[1] (1)The weighted average exercise price and weighted-average fair value of options outstanding as of the end of each reporting period reflect the adjustments to the awards as a result of the special cash dividend.