Redeemable Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at beginning			$ 12,244
Share of profit or loss attributable to redeemable noncontrolling interests	$ 1,162	$ 2,492	3,766	$ 4,877
Dividends paid	504	1,909	543	1,909
Balance at end	13,111		13,111
Payments to Acquire Additional Interest in Subsidiaries			13,100
Redeemable Noncontrolling Interest
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at beginning			99,043	81,806
Acquired through acquisitions during 2019				26,273
Impact of foreign exchange translation			13,403	(783)
Share of profit or loss attributable to redeemable noncontrolling interests			2,358	3,371
Redemption value adjustment for the current period			(4,100)	143
Dividends paid				(432)
Measurement period adjustments			(1,426)	5,700
Exercises of redeemable noncontrolling interests			10,744	538
Balance at end	$ 98,534	$ 115,540	$ 98,534	$ 115,540