Business and Summary of Significant Accounting Policies - Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Accounts Payable	$ 71,941	$ 98,655
Accrued Insurance Costs	47,649	55,411
Accrued Salaries and Benefits	41,612	47,939
Accrued Real Estate and Sales Taxes	32,986	32,952
Deferred Rent	31,859	25,110
Other Accrued Expenses and Liabilities	71,719	83,606
Accounts Payable and Accrued Liabilities	$ 297,766	$ 343,673