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Share-based Compensation and Equity - Summary of Stock Option Plans, by Exercise Price Range (Details) - $ / shares
shares 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]        
Exercise Prices $ 18.79 $ 19.30 $ 21.81 $ 26.12
Options Outstanding, Number of Shares (in shares) 9,020 9,903 10,928 11,427
Options Exercisable, Number of Shares (in shares) 7,878 8,606 9,004  
$13.97 - $15.55        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares) 674      
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) 8 years 3 months 22 days      
Options Exercisable, Number of Shares (in shares) 250      
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) 7 years 11 months 23 days      
Risk-Free Interest Rate, Minimum 1.81%      
Risk-Free Interest Rate, Maximum 3.05%      
Expected Volatility, Minimum 49.98%      
Expected Volatility, Maximum 64.18%      
$13.97 - $15.55 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices $ 13.97      
Expected Terms in Years 3 years 3 months      
$13.97 - $15.55 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices $ 15.55      
Expected Terms in Years 5 years 10 months 28 days      
$17.00- $19.56        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares) 5,730      
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) 3 years 8 months 9 days      
Options Exercisable, Number of Shares (in shares) 5,013      
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) 3 years 6 months      
Risk-Free Interest Rate, Minimum 0.49%      
Risk-Free Interest Rate, Maximum 2.94%      
Expected Volatility, Minimum 36.04%      
Expected Volatility, Maximum 69.74%      
$17.00- $19.56 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices $ 17.00      
Expected Terms in Years 2 years 7 months 6 days      
$17.00- $19.56 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices $ 19.56      
Expected Terms in Years 10 years      
$21.00 - $21.52        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares) 1,917      
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) 1 year 4 months 21 days      
Options Exercisable, Number of Shares (in shares) 1,916      
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) 1 year 4 months 21 days      
Risk-Free Interest Rate, Minimum 0.68%      
Risk-Free Interest Rate, Maximum 2.60%      
Expected Volatility, Minimum 38.16%      
Expected Volatility, Maximum 69.74%      
$21.00 - $21.52 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices $ 21.00      
Expected Terms in Years 2 years 11 months 1 day      
$21.00 - $21.52 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices $ 21.52      
Expected Terms in Years 6 years 6 months 7 days      
$22.32 - $31.92        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares) 699      
Options Outstanding, Weighted Average Remaining Contractual Terms (Years) 2 years 6 months 11 days      
Options Exercisable, Number of Shares (in shares) 699      
Options Exercisable, Weighted Average Remaining Contractual Terms (Years) 2 years 6 months 11 days      
Risk-Free Interest Rate, Minimum 0.60%      
Risk-Free Interest Rate, Maximum 2.93%      
Expected Volatility, Minimum 36.93%      
Expected Volatility, Maximum 53.80%      
$22.32 - $31.92 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices $ 22.32      
Expected Terms in Years 4 years      
$22.32 - $31.92 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices $ 31.92      
Expected Terms in Years 6 years 6 months 7 days      
$14.58 - $19.56        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares)   6,500    
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)   4 years 6 months 29 days    
Options Exercisable, Number of Shares (in shares)   5,549    
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)   4 years 2 months 19 days    
Risk-Free Interest Rate, Minimum   0.33%    
Risk-Free Interest Rate, Maximum   3.31%    
Expected Volatility, Minimum   32.18%    
Expected Volatility, Maximum   69.74%    
$14.58 - $19.56 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices   $ 14.58    
Expected Terms in Years   2 years 11 days    
$14.58 - $19.56 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices   $ 19.56    
Expected Terms in Years   10 years    
$21.00 - $21.28        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares)   693    
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)   2 years 2 months 5 days    
Options Exercisable, Number of Shares (in shares)   347    
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)   7 months 28 days    
Risk-Free Interest Rate, Minimum   0.43%    
Risk-Free Interest Rate, Maximum   3.60%    
Expected Volatility, Minimum   33.24%    
Expected Volatility, Maximum   57.79%    
$21.00 - $21.28 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices   $ 21.00    
Expected Terms in Years   2 years 1 month 9 days    
$21.00 - $21.28 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices   $ 21.28    
Expected Terms in Years   6 years 8 months 1 day    
$21.32 - $21.52        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares)   1,776    
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)   2 years 1 month 21 days    
Options Exercisable, Number of Shares (in shares)   1,776    
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)   2 years 1 month 21 days    
Risk-Free Interest Rate, Minimum   0.68%    
Risk-Free Interest Rate, Maximum   2.61%    
Expected Volatility, Minimum   38.16%    
Expected Volatility, Maximum   69.74%    
$21.32 - $21.52 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices   $ 21.32    
Expected Terms in Years   3 years 4 months 17 days    
$21.32 - $21.52 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices   $ 21.52    
Expected Terms in Years   6 years 6 months 18 days    
$21.68 - $22.32        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares)   221    
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)   1 year 11 months 9 days    
Options Exercisable, Number of Shares (in shares)   221    
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)   1 year 11 months 9 days    
Risk-Free Interest Rate, Minimum   0.57%    
Risk-Free Interest Rate, Maximum   3.03%    
Expected Volatility, Minimum   36.78%    
Expected Volatility, Maximum   52.47%    
$21.68 - $22.32 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices   $ 21.68    
Expected Terms in Years   2 years 2 months 4 days    
$21.68 - $22.32 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices   $ 22.32    
Expected Terms in Years   6 years 6 months 7 days    
$22.88 - $31.92        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares)   713    
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)   3 years 9 months 4 days    
Options Exercisable, Number of Shares (in shares)   713    
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)   3 years 9 months 4 days    
Risk-Free Interest Rate, Minimum   0.73%    
Risk-Free Interest Rate, Maximum   2.86%    
Expected Volatility, Minimum   39.03%    
Expected Volatility, Maximum   53.80%    
$22.88 - $31.92 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices   $ 22.88    
Expected Terms in Years   4 years    
$22.88 - $31.92 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices   $ 31.92    
Expected Terms in Years   6 years 6 months 7 days    
$18.36 - $19.56        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares)     3,601  
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)     9 months 18 days  
Options Exercisable, Number of Shares (in shares)     3,601  
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)     9 months 18 days  
Risk-Free Interest Rate, Minimum     0.32%  
Risk-Free Interest Rate, Maximum     4.20%  
Expected Volatility, Minimum     26.85%  
Expected Volatility, Maximum     52.47%  
$18.36 - $19.56 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices     $ 18.36  
Expected Terms in Years     1 year 10 months 24 days  
$18.36 - $19.56 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices     $ 19.56  
Expected Terms in Years     6 years 11 months 12 days  
$20.16 - $21.28        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares)     353  
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)     1 year 7 months 28 days  
Options Exercisable, Number of Shares (in shares)     353  
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)     1 year 7 months 28 days  
Risk-Free Interest Rate, Minimum     0.42%  
Risk-Free Interest Rate, Maximum     3.60%  
Expected Volatility, Minimum     33.24%  
Expected Volatility, Maximum     52.47%  
$20.16 - $21.28 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices     $ 20.16  
Expected Terms in Years     2 years 1 month 9 days  
$20.16 - $21.28 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices     $ 21.28  
Expected Terms in Years     6 years 6 months 7 days  
$21.48 - $21.52        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares)     438  
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)     3 years 9 months 22 days  
Options Exercisable, Number of Shares (in shares)     438  
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)     3 years 9 months 22 days  
Risk-Free Interest Rate, Minimum     0.68%  
Risk-Free Interest Rate, Maximum     2.63%  
Expected Volatility, Minimum     38.16%  
Expected Volatility, Maximum     52.47%  
$21.48 - $21.52 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices     $ 21.48  
Expected Terms in Years     3 years 4 months 17 days  
$21.48 - $21.52 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices     $ 21.52  
Expected Terms in Years     6 years 6 months 29 days  
$21.68 - $22.32        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares)     320  
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)     3 years 1 month 6 days  
Options Exercisable, Number of Shares (in shares)     320  
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)     3 years 1 month 6 days  
Risk-Free Interest Rate, Minimum     0.57%  
Risk-Free Interest Rate, Maximum     3.03%  
Expected Volatility, Minimum     36.78%  
Expected Volatility, Maximum     52.47%  
$21.68 - $22.32 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices     $ 21.68  
Expected Terms in Years     2 years 2 months 4 days  
$21.68 - $22.32 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices     $ 22.32  
Expected Terms in Years     6 years 6 months 7 days  
$22.40 - $31.92        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares)     6,216  
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)     7 years 26 days  
Options Exercisable, Number of Shares (in shares)     4,291  
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)     6 years 8 months 16 days  
Risk-Free Interest Rate, Minimum     0.73%  
Risk-Free Interest Rate, Maximum     2.86%  
Expected Volatility, Minimum     39.03%  
Expected Volatility, Maximum     58.84%  
$22.40 - $31.92 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices     $ 22.40  
Expected Terms in Years     4 years  
$22.40 - $31.92 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices     $ 31.92  
Expected Terms in Years     7 years 1 month 13 days  
$34.52        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices     $ 34.52  
Employee Time Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected dividend yield 0.00% 0.00% 0.00%