Leases Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Operating lease liabilities	$ 493,977
Lease assets	570,215
Lease liabilities	564,718
Accounting Standards Update 2016-02 [Member]
Operating lease assets		$ 495,000
Operating lease liabilities		$ 495,000
Other assets [Member]
Operating lease assets	495,399
Property and equipment, net [Member]
Finance lease assets, net	74,816
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	25,600
Accrued expenses [Member]
Operating lease liabilities, current	62,759
Current portion of long-term debt [Member]
Finance lease liabilities, current	9,786
Other long-term liabilities [Member]
Operating lease liabilities, non-current	431,218
Long-term debt, less current portion [Member]
Finance lease liabilities, non-current	$ 60,955