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Nature Of Operations And Significant Accounting Policies (Summary Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Amortization Period of Finite Lived Assets (in years) | 14 years |  |
Gross Asset | $ 291,106 | $ 299,889 |
Accumulated Amortization | 165,193 | 153,662 |
Finite-Lived Intangible Assets, Net | 125,913 | 146,227 | 162,636
Intellectual property rights [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Amortization Period of Finite Lived Assets (in years) | 18 years 10 months 24 days |  |
Gross Asset | 88,614 | 89,619 |
Accumulated Amortization | 47,202 | 46,286 |
Finite-Lived Intangible Assets, Net | 41,412 | 43,333 |
Customer relationships and backlog [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Amortization Period of Finite Lived Assets (in years) | 11 years 7 months 6 days |  |
Gross Asset | 140,250 | 146,291 |
Accumulated Amortization | 73,630 | 66,256 |
Finite-Lived Intangible Assets, Net | 66,620 | 80,035 |
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 | 11,824 |
Accumulated Amortization | 9,850 | 10,423 |
Finite-Lived Intangible Assets, Net | 1,299 | 1,401 |
Other [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted Average Amortization Period of Finite Lived Assets (in years) | 14 years 1 month 6 days |  |
Gross Asset | 51,093 | 52,155 |
Accumulated Amortization | 34,511 | 30,697 |
Finite-Lived Intangible Assets, Net | $ 16,582 | $ 21,458 |

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