Goodwill and Intangible Assets (Schedule of Carrying Amount of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Goodwill
Gross Goodwill Balance		$ 1,072,991us-gaap_GoodwillGross
Accumulated Impairment		(487,985)
Current activity
Goodwill	585,006us-gaap_Goodwill	585,006us-gaap_Goodwill
Civil [Member]
Goodwill
Gross Goodwill Balance		492,074
Accumulated Impairment		(76,716)
Goodwill	415,358	415,358
Building [Member]
Goodwill
Gross Goodwill Balance		424,724
Accumulated Impairment		(411,269)
Goodwill	13,455	13,455
Specialty Contractors [Member]
Goodwill
Gross Goodwill Balance		156,193
Goodwill	$ 156,193	$ 156,193

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Subparagraph (b)

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