Basis of Presentation (Schedule of Right-of-use Assets and Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019		Jan. 01, 2019
Basis of Presentation [Abstract]
Operating lease right-of-use assets, net	$ 2,549,143
Financing lease right-of-use assets, net	3,161
Right-of-use assets, net	2,552,304	[1]	$ 2,600,000
Current operating lease liabilities	227,819
Current financing lease liabilities	957
Current lease liabilities	228,776	[1]	226,000
Long-term operating lease liabilities	2,281,561
Long-term financing lease liabilities	1,242
Long-term lease liabilities	$ 2,282,803	[1]	$ 2,300,000

[1] On January 1, 2019, the Company adopted ASU 2016-02 which requires lessees to recognize a right-of-use asset and a lease liability. Upon adoption, certain assets and liabilities were reclassified to Right-of-use assets, net and lease liabilities in accordance with provisions of ASU 2016-02. See Note 1 for further discussion.