Costs And Estimated Earnings On Uncompleted Contracts (Summary Of Costs And Estimated Earnings On Uncompleted Contracts) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Costs And Estimated Earnings On Uncompleted Contracts [Abstract]
Costs incurred on uncompleted contracts	$ 65,088	$ 78,849
Estimated earnings	24,958	29,333
Billings to date	(77,916)	(95,055)
Costs and estimated earnings on uncompleted contracts	$ 12,130	$ 13,127

Amount of receivable reflecting the cost incurred on uncompleted contracts in excess of related billings.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 310
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6471842&loc=d3e55302-109406

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3(c)(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 35
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57795-111642

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 35
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57807-111642

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 3
-Subparagraph c(2), c(3), c(4)
-Article 5

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