Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Cumulative effect of new accounting pronouncement
Trade accounts receivable and contract assets, net	$ 196,629	$ 183,379
Other current assets, net	179,531	185,699
Other investments, net	325,405	275,873
Other non-current assets, net	334,841	340,904
Total assets	7,154,298	6,976,190
Deferred tax liabilities, net	351,692	349,973
Accumulated earnings	632,809	558,034
Non-controlling interests	75,748	58,425
Total stockholders’ equity	3,745,553	3,584,268	$ 3,605,575		$ 4,242,951	$ 4,179,536	$ 4,155,474
Total liabilities and stockholders’ equity	$ 7,154,298	6,976,190
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Accumulated Earnings (Losses)
Cumulative effect of new accounting pronouncement
Total stockholders’ equity	$ 632,809	$ 558,034	$ 569,446		$ 704,236	$ 709,928	$ 694,129
Adoption of ASC 326 Increase (Decrease)
Cumulative effect of new accounting pronouncement
Trade accounts receivable and contract assets, net				$ (13,672)
Other current assets, net				6,723
Other investments, net				(7,381)
Other non-current assets, net				4,050
Total assets				(10,280)
Deferred tax liabilities, net				(972)
Accumulated earnings				(9,068)
Non-controlling interests				(240)
Total stockholders’ equity	(9,308)			(9,308)
Total liabilities and stockholders’ equity				(10,280)
Adoption of ASC 326 Increase (Decrease) | Accumulated Earnings (Losses)
Cumulative effect of new accounting pronouncement
Total stockholders’ equity	(9,068)			(9,100)
Balance at January 1, 2020
Cumulative effect of new accounting pronouncement
Trade accounts receivable and contract assets, net				182,957
Other current assets, net				186,254
Other investments, net				318,024
Other non-current assets, net				338,891
Total assets				7,144,018
Deferred tax liabilities, net				350,720
Accumulated earnings				623,741
Non-controlling interests				75,508
Total stockholders’ equity	3,736,245			3,736,245
Total liabilities and stockholders’ equity				$ 7,144,018
Balance at January 1, 2020 | Accumulated Earnings (Losses)
Cumulative effect of new accounting pronouncement
Total stockholders’ equity	$ 623,741