Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) in operating activities	$ 1,286,279	$ 1,218,974	$ 690,750
Provisional income tax expense			23,900
Remeasurement of deferred taxes			23,900
Deferred taxes valuation allowance reduction			$ 24,300
Operating lease liabilities	130,393
Operating lease, right-of-use asset	$ 128,529
Minimum | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities				$ 143,900
Operating lease, right-of-use asset				145,000
Maximum | ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset				$ 155,000