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Revenues (Schedule of Changes in Contract Asset and Contract Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Contract with Customer, Asset, Net [Abstract]
Accrued revenue	$ 862	$ 3,235	$ 0
Costs and estimated profits in excess of billings	9,159	9,584	9,584
Contract assets	10,021	12,819
Increase (decrease) in contract with customer assets	$ (2,798)
Increase (Decrease) in contract with customer assets, percent	(22.00%)
Contract with Customer, Liability [Abstract]
Deferred revenue	$ 8,335	8,819	8,819
Billings in excess of costs and profits recognized	3,210	1,881	$ 1,881
Contract liabilities	11,545	$ 10,700
Increase (decrease) in contract with customer liabilities	$ 845
Increase (Decrease) in contract with customer liabilities, percent	8.00%

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Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress, Percent

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Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in measure of progress which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in measure of progress which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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