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New Accounting Pronouncements (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Jan. 01, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reduction to retained earnings due to adoption of new guidance		$ (2,477,291)				$ (2,191,059)				$ (2,477,291)	$ (2,191,059)
Additional revenues that would have been recognized under previous guidance		$ 3,112,218	$ 2,985,281	$ 2,656,348	$ 2,417,576	$ 2,478,627	$ 2,609,307	$ 2,200,374	$ 2,178,170	11,171,423	$ 9,466,478	$ 7,651,319
Accounting Standards Update 2014-09 \| Adjustment Due to Adoption of New Guidance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reduction to retained earnings due to adoption of new guidance													$ 1,300
Reduction to retained earnings due to adoption of new guidance, gross adjustment	$ 1,800
Reduction to retained earnings due to adoption of new guidance, tax	500
Additional revenues that would have been recognized under previous guidance										$ 2,000
Accounting Standards Update 2016-02 \| Minimum \| Subsequent Event \| Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease right-of-use asset	280,000
Lease liabilities	280,000
Accounting Standards Update 2016-02 \| Maximum \| Subsequent Event \| Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease right-of-use asset	320,000
Lease liabilities	$ 320,000