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Share-Based Compensation and Benefit Plans (Deferred Compensation Plan Shares Table) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share Based Compensation Awards (Deferred Compensation Plan Awards) Table [Abstract]      
Non-qualified deferred compensation share awards $ 77,230 $ 77,037  
Change in classification 16,407 13,388 $ 13,956
Change in redemption value (669) 10,038 9,145
Diversification of share awards (40,294) (23,233) (25,428)
Non-qualified deferred compensation share awards $ 52,674 $ 77,230 $ 77,037