Basis of Presentation and Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 13,026
Adjustments due to adoption of ASU 2016-13	10,555,966	$ 8,761,031	$ 10,388,258	$ 8,669,294		$ 8,840,382	$ 8,749,229	$ 8,424,788	$ 7,219,279
Provision for allowance for doubtful accounts	6,466	8,588
Net write-offs and recoveries	(5,181)
Accounts Receivable, Allowance For Credit Losses, Foreign Currency Translation	218
Ending balance	15,429
Retained Earnings
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Adjustments due to adoption of ASU 2016-13	$ 1,709,308	$ 1,266,430	$ 1,642,621	$ 1,509,317		1,391,425	$ 1,145,580	$ 1,002,053	889,948
Cumulative adjustment due to adoption of ASU
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Adjustments due to adoption of ASU 2016-13						(900)			(5,973)
Cumulative adjustment due to adoption of ASU | Retained Earnings
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Adjustments due to adoption of ASU 2016-13					$ (900)	$ (900)			$ (5,973)