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Revenue - Schedule of Deferred Charges Activity (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Deferred charges beginning balance	$ 1,374
Additions during the period	681
Recognized as cost of sales	(691)
Deferred charges ending balance	1,364
June 30 2019 [Member]
Recognized as cost of sales	917
June 30 2020 [Member]
Recognized as cost of sales	304	[1]
June 30 2021 and Thereafter [Member]
Recognized as cost of sales	$ 143	[1]
[1] Amounts included in Other Assets in the Company's Unaudited Condensed Consolidated Balance Sheets at June 30, 2018.

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