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Consolidated Statements of Equity (Parentheticals) - $ / shares
4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2017
Aug. 31, 2017
Dec. 31, 2018
Dec. 31, 2016
Predecessor [Member]        
Dividends declared   $ 1.14   $ 1.52
$4.50 Series Preferred Stock [Member] | Predecessor [Member]        
Preferred Stock, Dividends Per Share, Declared   3.375   4.50
$4.50 Series Preferred Stock [Member] | Successor [Member]        
Preferred Stock, Dividends Per Share, Declared $ 1.125   $ 4.50  
$3.50 Series Preferred Stock [Member] | Predecessor [Member]        
Preferred Stock, Dividends Per Share, Declared   $ 2.625   $ 3.500
$3.50 Series Preferred Stock [Member] | Successor [Member]        
Preferred Stock, Dividends Per Share, Declared $ 0.875   $ 3.500