Derivative Instruments, Fair Values Derivatives, Balance Sheet Location (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Asset derivatives	$ 49	$ 43
Liability derivatives	(160)	(103)
Net fair value	(111)	(60)
Prepaid Expenses and Other Current Assets [Member]
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Asset derivatives	49	43
Other Liabilities [Member]
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Liability derivatives	$ (160)	$ (103)