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Financial Instruments (Schedule of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011
Debt Instrument [Line Items] |  |
Long-term debt | $ 319,153 | $ 374,388
Less: current portion | (83,276) | (1,263)
Long-term debt, net of current portion | 235,877 | 373,125
Convertible Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 28,261 | 27,228
Debt issued | 28,437 |
Interest rate | 2.25% |
Year of maturity | 2026 |
Private Placement, Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 150,000 | 150,000
Debt issued | 150,000 |
Interest rate | 6.84% |
Maturity date | Oct. 25, 2017 |
Maturity date range, start | Jan. 01, 2013 |
Maturity date range, end | Dec. 31, 2017 |
Credit Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 132,000 | 187,000
Interest rate at end of period | 3.92% | 3.61%
Year of maturity | 2015 |
Various Notes and Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 8,892 | $ 10,160
Interest rate at end of period | 3.06% | 3.05%
Maturity date range, end | Dec. 31, 2021 |

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