Derivative Instruments, Fair Values Derivatives, Balance Sheet Location (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Asset derivatives	$ 145	$ 43
Liability derivatives	(128)	(103)
Net fair value	17	(60)
Foreign Exchange Contracts [Member] | Prepaid Expenses and Other Current Assets [Member]
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Asset derivatives	145	43
Interest Rate Swaps [Member] | Other Liabilities [Member]
Estimated fair value of the contracts in the consolidated balance sheets [Abstract]
Liability derivatives	$ (128)	$ (103)