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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Costs and estimated earnings in excess of billings beyond one year | $ 353,200 |
Indefinite lived intangible assets impairment charge | 0 |
Current deferred tax asset | 26,306 | $ 17,962
Current deferred tax liabilities | $ 24,900 |
Minimum [Member] |  |
Estimated useful lives | 3 years |
Maximum [Member] |  |
Estimated useful lives | 40 years |

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