Restatement of Financial Statements (Impact of Restatement on Consolidated Statement of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities
Net Loss	$ (2,135)	$ (4,014)
Adjustments to reconcile net loss to net cash provided by (used for) operating activities:
Depreciation and amortization	2,462	2,673
Deferred income taxes	(786)	(1,619)
Changes in working capital and other operating assets and liabilities, net
Other accrued expenses	595	$ 3,428
Previously Reported [Member]
Operating Activities
Net Loss	(3,012)
Adjustments to reconcile net loss to net cash provided by (used for) operating activities:
Depreciation and amortization	2,586
Deferred income taxes	(303)
Changes in working capital and other operating assets and liabilities, net
Other accrued expenses	865
Adjustment [Member]
Operating Activities
Net Loss	877
Adjustments to reconcile net loss to net cash provided by (used for) operating activities:
Depreciation and amortization	(124)
Deferred income taxes	(483)
Changes in working capital and other operating assets and liabilities, net
Other accrued expenses	$ (270)