Summary of Significant Accounting Policies Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Assets [Abstract]
Other Receivables	$ 15,698	$ 13,421
Servicing Asset	11,443	7,526
Prepaid Expense	11,227	6,036
Prepaid Land Acquisition Costs	4,740	4,144
Other Assets, Miscellaneous	19,818	15,015
Other Assets	$ 62,926	$ 46,142