Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation (Schedule of Cash-Settleable RSUs Outstanding) (Details)

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Share-Based Compensation (Schedule of Cash-Settleable RSUs Outstanding) (Details) - Cash-settleable RSU awards
shares in Thousands
 12 Months Ended
Dec. 31, 2019
shares
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs base units outstanding 689
Minimum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 24
Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 1,355
Vesting in 2020  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs base units outstanding 292
Vesting in 2020 | Minimum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 0
Vesting in 2020 | Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 586
Vesting in 2021  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs base units outstanding 373
Vesting in 2021 | Minimum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 0
Vesting in 2021 | Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 745
Vesting in 2022  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs base units outstanding 0
Vesting in 2022 | Minimum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 0
Vesting in 2022 | Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 0
Other  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs base units outstanding 24
Other | Minimum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 24
Other | Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 24