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Background and Significant Accounting Policies (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2011 BusinessLine | Dec. 31, 2010 | Dec. 31, 2009
Basis Of Presentation And Significant Accounting Policies (Textual) [Abstract] |  |  |
Duration of production and processing equipment fabrication project | between three and 36 months |  |
Number of business lines operate | 3 |  |
Investments in affiliated entities | More than a 20% |  |
Percentage interest in affiliated entities | 20.00% |  |
Original maturities of Cash equivalents | Three months or less |  |
Significant balances aged | Greater than 90 days |  |
Number of days for evaluating Significant balances | 90 days |  |
Bad debt expense | $ 1,610,000 | $ 4,750,000 | $ 5,929,000
Gain from non-income tax based tax receivables | 9,500,000 |  |
Importation penalties | 700,000 | 5,100,000 |
Amount of tax recognized upon settlement, Description | greater than 50 percent |  |
Amount of tax recognized upon settlement | 50.00% |  |
Change in fair value of derivative financial instruments | (2,126,000) | 8,797,000 | 13,088,000
Net of tax | $ 12,100,000 | $ 5,600,000 | $ 4,800,000
Computer Software, Intangible Asset [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Estimated useful life of computer software, minimum | 3 |  |
Estimated useful life of computer software, Maximum | 5 |  |
On conversion of 4.25% convertible senior notes due 2014 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.25% |  |
On conversion of 4.75% convertible senior notes due 2014 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.75% |  |

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