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Basis of Presentation and Accounting Policies (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ 3,643,868		$ 3,695,862
Allowance for doubtful accounts	72,084		53,412
Increase to allowance for credit loss	11,800
Accounts receivable, noncurrent	110,700		118,500
Allowance for credit loss, noncurrent	99,000		$ 101,400
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ 7,300
Allowance for doubtful accounts	$ 6,900

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