Summary of Significant Accounting Policies (Deferred Financing Costs, Net of Accumulated Amortization) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred financing costs	$ 11,530	$ 9,775
Accumulated amortization	(3,859)	(1,908)
Deferred financing costs, net	7,671	7,867
Fixed debt arrangements
Deferred financing costs	14,501	12,675
Accumulated amortization	(2,944)	(1,039)
Deferred financing costs, net	$ 11,557	$ 11,636