Income Taxes Components of income tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income (loss) from continuing operations before income taxes
United States	$ 10,159	$ (708)	$ 3,583
Canada	(65)	(823)	(2,431)
Income (loss) from continuing operations before income taxes	10,094	(1,531)	1,152
Current income tax expense (benefit):
U.S. Federal	296	97	(461)
U.S. state	129	(33)	75
Canada	1,209	3	1,241
Total	1,634	67	855
Deferred income tax expense (benefit):
Deferred Federal Income Tax Expense (Benefit)	(17,971)	0	0
Deferred State and Local Income Tax Expense (Benefit)	(3,257)	31	0
Deferred Foreign Income Tax Expense (Benefit)	0	0	0
Deferred Income Tax Expense (Benefit)	(21,228)	31	0
Total income tax expense (benefit):
Federal Income Tax Expense (Benefit), Continuing Operations	(17,675)	97	(461)
State and Local Income Tax Expense (Benefit), Continuing Operations	(3,128)	(2)	75
Foreign Income Tax Expense (Benefit), Continuing Operations	1,209	3	1,241
Income Tax Expense (Benefit)	$ (19,594)	$ 98	$ 855