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Revenue - Schedule of Deferred Charges Activity (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Deferred charges beginning balance	$ 1,374
Additions during the period	277
Recognized as cost of sales	(295)
Deferred charges ending balance	1,356
March 31 2019 [Member]
Recognized as cost of sales	963
March 31 2020 [Member]
Recognized as cost of sales	313	[1]
March 31 2021 and Thereafter [Member]
Recognized as cost of sales	$ 80	[1]
[1] Amounts included in Other Assets in the Company's Unaudited Condensed Consolidated Balance Sheets at March 31, 2018.

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