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Financial Instruments (Schedule of Long-Term Debt) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |
Long-term debt | $ 265,096 | $ 272,111
Less: current portion | (16) | (50,015)
Long-term debt, net of current portion | 265,080 | 222,096
Private Placement, Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 50,000 | 100,000
Interest rate | 6.84% |
Maturity date range, end | Dec. 31, 2017 |
Revolving Credit Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 215,000 | $ 172,000
Interest rate at end of period | 2.27% | 2.69%
Year of maturity | 2020 |
Various Notes and Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 96 | $ 111
Interest rate at end of period | 5.50% | 5.50%
Maturity date range, end | Dec. 31, 2021 |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: 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 Reference 2: 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 + Details
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