Nature Of Operations And Significant Accounting Policies (Summary Of Intangible Assets) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 204,400,000
Weighted Average Amortization Period of Finite Lived Assets (in years)	15 years 9 months 18 days
Gross Asset	568,248,000	591,952,000
Accumulated Amortization	214,794,000	183,029,000
Finite-Lived Intangible Assets, Net	353,454,000us-gaap_FiniteLivedIntangibleAssetsNet	408,923,000us-gaap_FiniteLivedIntangibleAssetsNet	125,913,000us-gaap_FiniteLivedIntangibleAssetsNet
Intellectual property rights [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	16 years 6 months
Gross Asset	91,291,000	95,052,000
Accumulated Amortization	50,435,000	48,960,000
Finite-Lived Intangible Assets, Net	40,856,000	46,092,000
Customer relationships and backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	15 years 6 months
Gross Asset	402,639,000	420,951,000
Accumulated Amortization	112,527,000	86,556,000
Finite-Lived Intangible Assets, Net	290,112,000	334,395,000
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	10,052,000	9,951,000
Finite-Lived Intangible Assets, Net	1,097,000	1,198,000
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period of Finite Lived Assets (in years)	12 years 10 months 24 days
Gross Asset	63,169,000	64,800,000
Accumulated Amortization	41,780,000	37,562,000
Finite-Lived Intangible Assets, Net	$ 21,389,000	$ 27,238,000

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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