Summary of Significant Accounting Policies (Deferred Financing Costs, Net of Accumulated Amortization) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Deferred financing costs	$ 7,132	$ 7,128
Accumulated amortization	(1,453)	(145)
Deferred financing costs, net	5,679	6,983
Fixed debt arrangements
Deferred financing costs	12,943	12,779
Accumulated amortization	(4,089)	(2,660)
Deferred financing costs, net	$ 8,854	$ 10,119