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Financial Instruments (Schedule of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |
Long-term debt | $ 333,636 | $ 319,153
Less: current portion | (55,014) | (83,276)
Long-term debt, net of current portion | 278,622 | 235,877
Convertible Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt |  | 28,261
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 | 176,000 | 132,000
Interest rate at end of period | 2.68% | 3.92%
Year of maturity | 2018 |
Various Notes and Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 7,636 | $ 8,892
Interest rate at end of period | 3.06% | 3.06%
Maturity date range, end | Dec. 31, 2021 |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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