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Share-Based Compensation and Benefit Plans (Deferred Compensation Plan Shares Table) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share Based Compensation Awards (Deferred Compensation Plan Awards) Table [Abstract]      
Non-qualified deferred compensation share awards $ 79,364 $ 68,134  
Change in classification 13,956 10,999 $ 7,702
Change in redemption value 9,145 3,788 17,921
Diversification of share awards (25,428) (3,557) (4,669)
Non-qualified deferred compensation share awards $ 77,037 $ 79,364 $ 68,134