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Financial Instruments (Schedule of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Oct. 31, 2013 Private Placement, Notes [Member] | Dec. 31, 2013 Private Placement, Notes [Member] | Dec. 31, 2012 Private Placement, Notes [Member] | Dec. 31, 2013 Credit Agreement [Member] | Dec. 31, 2012 Credit Agreement [Member] | Dec. 31, 2013 Convertible Notes [Member] | Dec. 31, 2012 Convertible Notes [Member] | Dec. 31, 2013 Various Notes and Mortgages [Member] | Dec. 31, 2012 Various Notes and Mortgages [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | $ 303,875 | $ 319,153 |  |  | $ 100,000 | $ 150,000 | $ 200,000 | $ 132,000 |  | $ 28,261 | $ 3,875 | $ 8,892
Less: current portion | (3,764) | (83,276) |  |  |  |  |  |  |  |  |  |
Long-term debt, net of current portion | 300,111 | 235,877 |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  | 150,000 |  |  |  |  | 28,437 |  |
Interest rate |  |  |  |  | 6.84% |  |  |  | 2.25% |  |  |
Interest rate at end of period |  |  |  |  |  |  | 2.53% | 3.92% |  |  | 3.10% | 3.06%
Maturity date |  |  |  |  | Oct. 25, 2017 |  |  |  |  |  |  |
Year of maturity |  |  |  |  |  |  | 2018 |  | 2026 |  |  |
Maturity date range, start |  |  |  |  | Jan. 01, 2015 |  |  |  |  |  |  |
Maturity date range, end |  |  |  |  | Dec. 31, 2017 |  |  |  |  |  | Dec. 31, 2021 |
Repayments of debt | $ 132,691 | $ 102,128 | $ 65,575 | $ 50,000 |  |  |  |  |  |  |  |

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