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Noncontrolling Interests (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Noncontrolling Interests      
Net earnings attributable to noncontrolling interests $ 73,092 $ 46,048 $ 62,494
Distributions paid to noncontrolling interests 47,215 57,904 58,986
Capital contributions by noncontrolling interests $ 6,397 $ 9,072 $ 5,254