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Employee Termination Benefits (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]            
Cash       $ 3,802 $ 19,526 $ 2,990
Share-Based Compensation       $ 990 $ 13,131 $ 1,825
Number of Shares (in shares)       81 763 96
Total Employee Termination Benefits $ 300 $ 4,500 $ 31,600 $ 4,792 $ 32,657 $ 4,815
Executive Employee Termination Benefits            
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]            
Cash       1,194 11,945 2,500
Share-Based Compensation       $ 490 $ 9,196 $ 1,825
Number of Shares (in shares)       37 554 96
Total Employee Termination Benefits       $ 1,684 $ 21,141 $ 4,325
Other Employee Termination Benefits            
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]            
Cash       2,608 7,581 490
Share-Based Compensation       $ 500 $ 3,935 $ 0
Number of Shares (in shares)       44 209 0
Total Employee Termination Benefits       $ 3,108 $ 11,516 $ 490