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Costs and Estimated Earnings on Uncompleted Contracts (Summary of Costs and Estimated Earnings on Uncompleted Contracts) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Costs and Estimated Earnings on Uncompleted Contracts [Abstract] |  |
Costs incurred on uncompleted contracts | $ 38,464 | $ 31,404
Estimated earnings | 16,655 | 10,541
Billings to date | (31,952) | (24,771)
Costs and estimated earnings on uncompleted contracts | $ 23,167 | $ 17,174

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