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Share-Based Incentives (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Service period 3 years    
Compensation expense $ 2,000    
Compensation liability 2,000    
Shares purchased by employees 11,000    
Share based compensation expense   $ 36,000 $ 42,000
Tax benefit of share-based compensation expense   40,000 7,000
Settlement of share-based awards upon change in control 0 (75,531) 0
RSUs and PSUs [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Fair value of units vested 95,000 22,000  
Additional paid-in capital      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Settlement of share-based awards upon change in control $ 0 $ 75,311 $ 0