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Real Estate - Sales (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Real Estate [Abstract]      
Proceeds from sales of real estate $ 864,347 $ 1,607,806 $ 390,943
Gain on sale of real estate $ 167,231 $ 137,370 $ 73,616