Recent Accounting Developments Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 1,059,766			$ 0
Current maturities of operating leases	117,376			0
Operating leases, less current maturities	$ 915,977			$ 0
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		$ 1,000,000
Current maturities of operating leases		128,100
Operating leases, less current maturities		$ 895,100
Restatement Adjustment [Member] | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ (5,500)