Commitments And Contingencies (Narrative) (Details) - USD ($)			3 Months Ended
	Feb. 05, 2016	Jan. 14, 2015	Mar. 31, 2016
Commitments And Contingencies [Line Items]
Outstanding performance bonds			$ 1,093,262,000
Revenue value remaining from outstanding performance bonds			579,451,000
Tentative settlement subject to final documentation	$ 275,000
Proceeds from Legal Settlements		$ 5,309,000
Discontinued Operations [Member]
Commitments And Contingencies [Line Items]
Outstanding performance bonds			41,082,000
Minimum [Member]
Commitments And Contingencies [Line Items]
Bids bond range			$ 1,000,000
Warranty periods			1 year
Maximum [Member]
Commitments And Contingencies [Line Items]
Bids bond range			$ 10,000,000
Warranty periods			3 years