Supplemental Cash Flow Information (Details) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Supplemental Cash Flow Elements [Abstract]
Interest paid	$ 533,000	$ 546,000
Income taxes paid	0	$ 0
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Common stock issued	76,000
Common Stock
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Common stock issued	5,000
Additional Paid-in Capital
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Common stock issued	$ 71,000