Basis Of Presentation and Significant Accounting Policies Basis Of Presentation and Significant Accounting Policies- Components of Cash (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Aug. 22, 2016
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 3,474,000	$ 2,319,000
Restricted cash and cash equivalents	8,612,000	10,431,000
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	12,086,000	12,750,000	$ 2,159,000	$ 5,962,000
Corporate Credit Cards
Cash and Cash Equivalents [Line Items]
Restricted cash and cash equivalents	200,000	200,000
Amendment Agreement | Secured Debt
Cash and Cash Equivalents [Line Items]
Maximum prepayment of principle if demanded					$ 18,500,000.0
Restricted cash	$ 8,400,000	$ 10,200,000