Summary of Significant Accounting Policies (Deferred Financing Costs, Net of Accumulated Amortization) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred financing costs	$ 13,776	$ 11,530
Accumulated amortization	(5,743)	(3,859)
Deferred financing costs, net	8,033	7,671
Fixed debt arrangements
Deferred financing costs	15,777	14,501
Accumulated amortization	(4,937)	(2,944)
Deferred financing costs, net	$ 10,840	$ 11,557