Restatement of Financial Statements (Impact of Restatement on Consolidated Balance Sheet) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Assets
Intangible assets, net	$ 228	$ 304
Goodwill
Deferred income taxes, net	4,358	3,572
Total Assets	136,251	122,560
Liabilities and Shareholders' Equity
Other accrued expense	6,297	5,586
Total current liabilities	28,800	31,663
Other liabilities	4,764	7,045
Total liabilities	89,585	71,762
Accumulated deficit	(397,437)	(393,582)
Total shareholders' equity	46,666	50,798	$ 92,124	$ 97,699
Total liabilities and shareholders’ equity	136,251	$ 122,560
Previously Reported [Member]
Assets
Intangible assets, net	3,074
Goodwill	13,973
Deferred income taxes, net	6,720
Total Assets	155,432
Liabilities and Shareholders' Equity
Other accrued expense	6,635
Total current liabilities	29,138
Other liabilities	4,696
Total liabilities	89,855
Accumulated deficit	(378,526)
Total shareholders' equity	65,577
Total liabilities and shareholders’ equity	155,432
Adjustment [Member]
Assets
Intangible assets, net	(2,846)
Goodwill	(13,973)
Deferred income taxes, net	(2,362)
Total Assets	(19,181)
Liabilities and Shareholders' Equity
Other accrued expense	(338)
Total current liabilities	(338)
Other liabilities	68
Total liabilities	(270)
Accumulated deficit	(18,911)
Total shareholders' equity	(18,911)
Total liabilities and shareholders’ equity	$ (19,181)