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Share-based Compensation - Summary of Stock Option Plans, by Exercise Price Range (Details) - $ / shares
shares in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices $ 19.30 $ 21.81 $ 26.12 $ 25.84
Options Outstanding, Number of Shares (in shares) 9,903 10,928 11,427 10,919
Options Exercisable, Number of Shares (in shares) 8,606 9,004 8,293  
$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      
$18.36 - $19.56        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares)   3,601 3,790  
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)   9 months 18 days 1 year 9 months 18 days  
Options Exercisable, Number of Shares (in shares)   3,601 3,790  
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)   9 months 18 days 1 year 9 months 18 days  
Risk-Free Interest Rate, Minimum   0.32% 0.32%  
Risk-Free Interest Rate, Maximum   4.20% 4.20%  
Expected Volatility, Minimum   26.85% 26.85%  
Expected Volatility, Maximum   52.47% 52.47%  
$18.36 - $19.56 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices   $ 18.36 $ 18.36  
Expected Terms in Years   1 year 10 months 24 days 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 $ 19.56  
Expected Terms in Years   6 years 11 months 12 days 6 years 11 months 12 days  
$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      
$20.16 - $21.28        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares)   353 353  
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)   1 year 7 months 28 days 2 years 8 months 12 days  
Options Exercisable, Number of Shares (in shares)   353 353  
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)   1 year 7 months 28 days 2 years 8 months 12 days  
Risk-Free Interest Rate, Minimum   0.42% 0.42%  
Risk-Free Interest Rate, Maximum   3.60% 3.60%  
Expected Volatility, Minimum   33.24% 33.24%  
Expected Volatility, Maximum   52.47% 52.47%  
$20.16 - $21.28 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices   $ 20.16 $ 20.16  
Expected Terms in Years   2 years 1 month 9 days 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 $ 21.28  
Expected Terms in Years   6 years 6 months 7 days 6 years 6 months 7 days  
$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      
$21.48 - $21.52        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares)   438 516  
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)   3 years 9 months 22 days 4 years 9 months 18 days  
Options Exercisable, Number of Shares (in shares)   438 512  
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)   3 years 9 months 22 days 4 years 9 months 18 days  
Risk-Free Interest Rate, Minimum   0.68% 0.68%  
Risk-Free Interest Rate, Maximum   2.63% 2.63%  
Expected Volatility, Minimum   38.16% 38.16%  
Expected Volatility, Maximum   52.47% 52.47%  
$21.48 - $21.52 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices   $ 21.48 $ 21.48  
Expected Terms in Years   3 years 4 months 17 days 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 $ 21.52  
Expected Terms in Years   6 years 6 months 29 days 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) 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      
$21.68 - $22.32        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares)   320 344  
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)   3 years 1 month 6 days 4 years 1 month 6 days  
Options Exercisable, Number of Shares (in shares)   320 344  
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)   3 years 1 month 6 days 4 years 1 month 6 days  
Risk-Free Interest Rate, Minimum   0.57% 0.57%  
Risk-Free Interest Rate, Maximum   3.03% 3.03%  
Expected Volatility, Minimum   36.78% 36.78%  
Expected Volatility, Maximum   52.47% 52.47%  
$21.68 - $22.32 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices   $ 21.68 $ 21.68  
Expected Terms in Years   2 years 2 months 4 days 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 $ 22.32  
Expected Terms in Years   6 years 6 months 7 days 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      
$22.40 - $31.92        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Number of Shares (in shares)   6,216 2,634  
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)   7 years 26 days 8 years 2 months 12 days  
Options Exercisable, Number of Shares (in shares)   4,291 1,108  
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)   6 years 8 months 16 days 7 years 1 month 21 days  
Risk-Free Interest Rate, Minimum   0.73% 0.73%  
Risk-Free Interest Rate, Maximum   2.86% 2.86%  
Expected Volatility, Minimum   39.03% 39.03%  
Expected Volatility, Maximum   58.84% 58.84%  
$22.40 - $31.92 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices   $ 22.40 $ 22.40  
Expected Terms in Years   4 years 4 years  
$22.40 - $31.92 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices   $ 31.92 $ 31.92  
Expected Terms in Years   7 years 1 month 13 days 6 years 6 months 7 days  
34.52        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise Prices     $ 34.52  
Options Outstanding, Number of Shares (in shares)     3,788  
Options Outstanding, Weighted Average Remaining Contractual Terms (Years)     7 years 9 months 18 days  
Options Exercisable, Number of Shares (in shares)     2,184  
Options Exercisable, Weighted Average Remaining Contractual Terms (Years)     7 years 9 months 18 days  
Risk-Free Interest Rate, Minimum     1.76%  
Risk-Free Interest Rate, Maximum     2.07%  
Expected Volatility, Minimum     51.51%  
Expected Volatility, Maximum     53.51%  
34.52 | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected Terms in Years     6 years 7 days  
34.52 | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected Terms in Years     7 years 1 month 13 days  
Employee Time Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected dividend yield 0.00% 0.00% 0.00%