Summary of Significant Accounting Policies Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Assets [Abstract]
Other Receivables	$ 13,632	$ 14,981
Servicing Asset	6,477	7,821
Prepaid Expense	8,605	9,022
Prepaid Land Acquisition Costs	7,873	5,634
Other Assets, Miscellaneous	24,207	23,677
Other Assets	$ 60,794	$ 61,135