Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value Assets and Liabilities Measured On Recurring and Nonrecurring Basis
Notes payable including related party, gross	$ 865,657	$ 545,824
Significant Other Observable Inputs (Level 2) | Fair Value Measurements Nonrecurring
Fair Value Assets and Liabilities Measured On Recurring and Nonrecurring Basis
Notes payable including related party, gross	865,700	545,800
Notes payable, fair value	$ 864,100	$ 540,300