Organization and Accounting Policies (Rollforward Analysis of the Allowance Against Accounts Receivable Balance) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Organization and Accounting Policies [Abstract]
Balance at beginning of year	$ (1,854)	$ (7,164)	$ (2,535)	$ (7,033)
Bad debt (recovery) expense	(5)	(145)	24	(89)
Adjustment associated with settlement of customs audit			623
Foreign currency gain (loss)	(17)	361	12	174
Balance at end of period	$ (1,876)	$ (6,948)	$ (1,876)	$ (6,948)