Basis and Summary of Significant Accounting Policies - Components of Prepaid Expenses and Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Prepaid Expenses	$ 27,467	$ 30,763
Prepaid Insurance	24,072	27,948
Assets Held for Sale	8,974	6,589
Deferred Tax Asset	8,761	8,761
Other Assets	23,207	24,161
Prepaid Expenses and Other Assets	$ 92,481	$ 98,222