Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Share-Based Compensation (Schedule of Cash-Settleable RSUs Outstanding) (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2017
shares
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs base units outstanding 568
Minimum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 233
Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 903
Vesting in 2018  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs base units outstanding 165
Vesting in 2018 | Minimum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 13
Vesting in 2018 | Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 316
Vesting in 2019  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs base units outstanding 200
Vesting in 2019 | Minimum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 17
Vesting in 2019 | Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 384
Vesting in 2020  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs base units outstanding 0
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 0
Other  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs base units outstanding 203
Other | Minimum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 203
Other | Maximum  
Defined Benefit Plan Disclosure [Line Items]  
Cash-settleable RSUs potential units vesting 203