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Financial Instruments (Schedule of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |
Long-term debt | $ 301,622 | $ 303,875
Less: current portion | (2,514) | (3,764)
Long-term debt, net of current portion | 299,108 | 300,111
Private Placement, Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 100,000 | 100,000
Interest rate | 6.84% |
Maturity date | Oct. 25, 2017 |
Maturity date range, start | Jan. 01, 2015 |
Maturity date range, end | Dec. 31, 2017 |
Credit Agreement [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 199,000 | 200,000
Interest rate at end of period | 2.53% | 2.53%
Year of maturity | 2018 |
Various Notes and Mortgages [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 2,622 | $ 3,875
Interest rate at end of period | 3.14% | 3.10%
Maturity date range, end | Dec. 31, 2021 |

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