Organization and Accounting Policies (Rollforward of the Allowance for Bad Debt) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Organization and Accounting Policies [Abstract]
Balance at beginning of period	$ (1,725)	$ (1,854)	$ (1,508)	$ (2,535)
Bad debt recovery (charge)	(179)	(5)	(989)	24
Adjustment associated with reversal of allowance on Mutamba			593
Adjustment associated with settlement of customs audit				623
Foreign currency gain (loss)		(17)		12
Balance at end of period	$ (1,904)	$ (1,876)	$ (1,904)	$ (1,876)