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Financial Instruments (Schedule of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |
Long-term debt | $ 307,129 | $ 319,153
Less: current portion | (55,014) | (83,276)
Long-term debt, net of current portion | 252,115 | 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 | 152,000 | 132,000
Interest rate at end of period | 2.84% | 3.92%
Year of maturity | 2018 |
Various Notes and Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 5,129 | $ 8,892
Interest rate at end of period | 3.08% | 3.06%
Maturity date range, end | Dec. 31, 2021 |

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- Definition The effective interest rate at the end of the reporting period. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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