Nature Of Operations And Significant Accounting Policies (Summary Of Intangible Assets) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 219,400,000
Weighted Average Amortization Period of Finite Lived Assets (in years)	14 years 8 months 12 days
Gross Asset	591,952,000	291,106,000
Accumulated Amortization	183,029,000	165,193,000
Finite-Lived Intangible Assets, Net	408,923,000	125,913,000	146,227,000
Intellectual property rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	18 years 2 months 12 days
Gross Asset	95,052,000	88,614,000
Accumulated Amortization	48,960,000	47,202,000
Finite-Lived Intangible Assets, Net	46,092,000	41,412,000
Customer relationships and backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	13 years 10 months 24 days
Gross Asset	420,951,000	140,250,000
Accumulated Amortization	86,556,000	73,630,000
Finite-Lived Intangible Assets, Net	334,395,000	66,620,000
Drawings [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	37 years 10 months 24 days
Gross Asset	11,149,000	11,149,000
Accumulated Amortization	9,951,000	9,850,000
Finite-Lived Intangible Assets, Net	1,198,000	1,299,000
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	12 years 8 months 12 days
Gross Asset	64,800,000	51,093,000
Accumulated Amortization	37,562,000	34,511,000
Finite-Lived Intangible Assets, Net	$ 27,238,000	$ 16,582,000