Stock-based Compensation - Stock Option Activity (Details) - 2008 LTIP - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Stock-based compensation
Shares authorized to be granted under stock compensation plan	2,000,000		2,000,000
Shares available for future awards	1,293,109		1,293,109
Stock Options
Number Outstanding
Outstanding at beginning of period (in shares)			537,500	540,625
Granted during period (in shares)	0	0	0	0
Exercised during period (in shares)			0	0
Forfeited or expired during period (in shares)			0	0
Outstanding at end of period (in shares)	537,500	540,625	537,500	540,625
Exercisable at end of period (in shares)	267,500	180,625	267,500	180,625
Weighted Average Exercise Price
Outstanding at beginning of period (in dollars per share)			$ 2.19	$ 2.18
Outstanding at end of period (in dollars per share)	$ 2.19	$ 2.18	2.19	2.18
Exercisable at end of period (in dollars per share)	$ 2.71	$ 3.29	$ 2.71	$ 3.29
Additional disclosures
Stock based compensation expense (reversal of expense)	$ 10	$ 10	$ 29	$ 29
Unrecognized compensation cost, options	$ 94		$ 94
Period for recognizing unrecognized compensation cost			2 years 4 months 24 days