Basis of Presentation and Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($) $ in Thousands		6 Months Ended
	Jan. 01, 2020	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 13,026	$ 13,026
Adjustments due to adoption of ASU 2016-13		10,388,258	$ 8,749,229	$ 8,669,294	$ 8,840,382	$ 8,424,788	$ 7,219,279
Provision for allowance for doubtful accounts		11,496	7,097
Net write-offs and recoveries		(4,519)
Ending balance		20,903
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Retained Earnings
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Adjustments due to adoption of ASU 2016-13		1,642,621	$ 1,145,580	$ 1,509,317	1,391,425	$ 1,002,053	889,948
Accounting Standards Update 2016-13
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Ending balance	$ 900
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)
COVID-19
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Ending balance		$ 6,300