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Share-Based Compensation (Summarized Information About RSU MSPs Outstanding) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
RSU Outstanding, RSUs 381,561  
Share-based Payment Arrangement, Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 712,500 742,658
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 43.76 $ 50.26
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 4,042  
Weighted average contractual term for stock-options outstanding 4 years 1 month 6 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (457,778,000)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 46.12  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 1,874 $ 1,900
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 3 years 2 months 12 days  
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding $ 12,714  
RSU Outstanding, RSUs 274,959  
RSU Awards Outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 8 months 12 days  
RSU Outstanding, Weighted Average Exercise Price $ 38.51 $ 45.66
RSU Vested, RSUs (5,689,000)  
RSU Vested, Weighted Average Exercise Price $ 51.71  
Aggregate intrinsic value of RSU awards exercisable $ 263 $ 300
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Exercisable, Weighted Average Remaining Contractual Term 6 months  
RSU MSPs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding $ 1,938  
RSU Outstanding, RSUs 106,602  
RSU Awards Outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 4 months 24 days  
RSU Outstanding, Weighted Average Exercise Price $ 28.06 $ 32.25
RSU Vested, RSUs (5,446,000) (7,972,000)
RSU Vested, Weighted Average Exercise Price $ 31.90  
Aggregate intrinsic value of RSU awards exercisable $ 78  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Exercisable, Weighted Average Remaining Contractual Term 1 month 6 days  
$32.25 - $71.56 | Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, Lower Range Limit $ 32.25  
Range of Exercise Prices, Upper Range Limit $ 71.56  
RSU Awards Outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 9 months 18 days  
$32.25 - $71.56 | RSU MSPs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
RSU Awards Outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 10 months 24 days  
$26.06 - 33.99 | RSU MSPs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, Lower Range Limit $ 26.06  
Range of Exercise Prices, Upper Range Limit 33.99  
34.00 - 39.99 | RSU MSPs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, Lower Range Limit 34.00  
Range of Exercise Prices, Upper Range Limit 39.99  
40.00 - 40.86 | RSU MSPs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, Lower Range Limit 40.00  
Range of Exercise Prices, Upper Range Limit 40.86  
$26.06 - $40.86 | RSU MSPs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of Exercise Prices, Lower Range Limit 26.06  
Range of Exercise Prices, Upper Range Limit $ 40.86