Detail of Selected Balance Sheet Accounts (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018
Goodwill [Roll Forward]
Balance at beginning of year	$ 22,353		$ 22,353
Less purchase price adjustment
Balance at end of year	$ 22,353	[1]	$ 22,353

[1] The balance is net of $12.6 million of accumulated impairment losses, of which none were recorded in 2019 or 2018.