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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Costs and estimated earnings in excess of billings beyond one year | $ 443,700,000 |  |
Contract Receivable Retainage, Estimated Collection After One Year, Percentage | 30.00% |  |
Contract Payable Retainage, Estimated Remittance After One Year, Percentage | 19.00% |  |
Goodwill impairment charge | $ 0 |  |
Indefinite lived intangible assets impairment charge | 0 |  |
Net Cash Provided by (Used in) Investing Activities | (41,409,000) | $ (18,495,000) | $ (32,415,000)
Accounting Standards Update 2016-18 [Member] |  |  |
Net Cash Provided by (Used in) Investing Activities | $ 45,700,000 | $ (4,700,000) | $ (1,500,000)
Minimum [Member] |  |  |
Estimated useful lives | 3 years |  |
Maximum [Member] |  |  |
Estimated useful lives | 40 years |  |

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