Redeemable Noncontrolling Interests Activity (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Redeemable noncontrolling interests				$ 299,558				$ 218,604	$ 299,558	$ 218,604
Net earnings									22,320	15,026
Distributions									(12,120)	(11,450)
Additions from acquisitions										77,378
Operating income	$ 41,719	$ 168,438	$ 170,257	$ 244,863	$ 137,124	$ 164,599	$ 191,531	$ 233,655	625,277	726,909	$ 722,359
Other									(307)
Redeemable noncontrolling interests	$ 309,451				$ 299,558				$ 309,451	$ 299,558	$ 218,604