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Stock Incentive Plan (Performance Award Transactions) (Details) - Performance Shares - shares
12 Months Ended
Jan. 23, 2018
Dec. 31, 2018
Share Activity    
Shares awarded but not earned at January 1 (in shares)   1,645,078
Shares awarded (in shares) 273,665 441,740
Shares forfeited or unearned (in shares)   (81,932)
Shares earned (in shares)   (1,066,024)
Shares awarded but not earned at December 31 (in shares)   938,862