Detail of Selected Balance Sheet Accounts (Details 3) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Goodwill [Roll Forward]
Balance at beginning of year		$ 22,353	$ 22,770
Less purchase price adjustment			417
Balance at end of year	[1]	$ 22,353	$ 22,353

[1] The balance is net of $12.6 million of accumulated impairment losses.