Summary of Significant Accounting Policies Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Assets [Abstract]
Other Receivables	$ 22,237	$ 16,083
Servicing Asset	9,237	9,614
Prepaid Expense	15,918	13,841
Prepaid Land Acquisition Costs	10,092	5,688
Other Assets, Miscellaneous	37,691	25,085
Other Assets	$ 95,175	$ 70,311