Basis and Summary of Significant Accounting Policies - Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Accounts Payable	$ 56,680	$ 89,959
Accrued Insurance Costs	54,314	44,032
Accrued Salaries and Benefits	53,636	43,972
Accrued Real Estate and Sales Taxes	34,394	32,763
Other Accrued Expenses and Liabilities	50,158	62,090
Accounts Payable and Accrued Expenses	$ 249,182	$ 272,816