Basis of Presentation and Accounting Policies (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting Standards Update		us-gaap:AccountingStandardsUpdate201613Member
Retained earnings	$ 3,625,291	$ 3,652,244
Allowance for doubtful accounts	76,061	53,412
Increase to allowance for credit loss	15,800
Accounts receivable, noncurrent	108,200	118,500
Allowance for credit loss, noncurrent	97,900	101,400
ASU No. 2016-13 - Measurement of Credit Losses on Financial Instruments (Topic 326)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ 7,300
Allowance for doubtful accounts	$ 6,900