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Fair Value Measurements (Details) (Fair value measured on a recurring basis, USD $)
In Thousands, unless otherwise specified |
Sep. 28, 2013
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Dec. 31, 2012
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Sep. 29, 2012
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|---|---|---|---|
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Estimated Fair Value
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| Fair value measurements | |||
| Cash and cash equivalents | $ 32,734 | $ 63,862 | $ 37,124 |
| Auction rate security | 10,162 | 9,485 | 8,130 |
| Available-for-sale securities excluding the auction rate security | 123,391 | 84,568 | 84,437 |
| Trading securities | 58,968 | 49,378 | 48,382 |
| Total assets measured at fair value | 225,381 | 207,181 | 178,221 |
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Estimated Fair Value | Foreign currency forward contracts
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| Fair value measurements | |||
| Derivative instruments, net | 29 | ||
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Estimated Fair Value | Commodity futures contracts, net
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| Fair value measurements | |||
| Derivative instruments, net | 97 | (112) | 48 |
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Estimated Fair Value | Commodity option contracts
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| Fair value measurements | |||
| Derivative instruments, net | 100 | ||
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Level 1
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| Fair value measurements | |||
| Cash and cash equivalents | 32,734 | 63,862 | 37,124 |
| Trading securities | 58,968 | 49,378 | 48,382 |
| Total assets measured at fair value | 91,799 | 113,128 | 85,654 |
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Level 1 | Commodity futures contracts, net
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| Fair value measurements | |||
| Derivative instruments, net | 97 | (112) | 48 |
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Level 1 | Commodity option contracts
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| Fair value measurements | |||
| Derivative instruments, net | 100 | ||
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Level 2
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| Fair value measurements | |||
| Available-for-sale securities excluding the auction rate security | 123,391 | 84,568 | 84,437 |
| Total assets measured at fair value | 123,420 | 84,568 | 84,437 |
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Level 2 | Foreign currency forward contracts
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| Fair value measurements | |||
| Derivative instruments, net | 29 | ||
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Level 3
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| Fair value measurements | |||
| Auction rate security | 10,162 | 9,485 | 8,130 |
| Total assets measured at fair value | $ 10,162 | $ 9,485 | $ 8,130 |