Basis and Summary of Significant Accounting Policies - Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Accounts Payable	$ 72,190	$ 88,369
Accrued Insurance Costs	41,872	40,423
Accrued Salaries and Benefits	49,052	40,790
Accrued Real Estate and Sales Taxes	32,337	30,332
Deferred Rent	0	27,270
Other Accrued Expenses and Liabilities	58,783	65,969
Accounts Payable and Accrued Expenses	$ 254,234	$ 293,153