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Basis and Summary of Significant Accounting Policies - Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Accounts Payable $ 57,414 $ 88,369
Accrued Insurance Costs 40,745 40,423
Accrued Salaries and Benefits 40,125 40,790
Accrued Real Estate and Sales Taxes 27,379 30,332
Deferred Rent   27,270
Other Accrued Expenses and Liabilities 61,250 65,969
Accounts Payable and Accrued Expenses $ 226,913 $ 293,153