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Subsequent Event (Notes)
 6 Months Ended
Jun. 30, 2018
Subsequent Events [Abstract]  
Subsequent Events [Text Block]
(8)
Subsequent Event
On July 2, 2018, the Company declared a quarterly dividend of $0.26 per share or $188,400,000, payable August 1, 2018 to stockholders of record as of the close of business July 13, 2018.