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Geographical Operating Information (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Geographic Operating Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) | $ 115,678,000 | $ 113,174,000 | $ 98,590,000 | $ 84,009,000 | $ 81,325,000 | [1] | $ 108,310,000 | $ 79,073,000 | $ 87,578,000 | $ 411,451,000 | $ 356,286,000 | $ 281,951,000
Assets | 3,122,951,000 |  |  |  | 2,569,348,000 |  |  |  |  | 3,122,951,000 | 2,569,348,000 |
United States |  |  |  |  |  |  |  |  |  |  |  |
Geographic Operating Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  | 1,467,000,000 | 1,378,000,000 | 1,228,000,000
Operating Income (Loss) |  |  |  |  |  |  |  |  |  | 409,000,000 | 350,000,000 | 268,000,000
Assets | 3,022,000,000 |  |  |  | 2,473,000,000 |  |  |  |  | 3,022,000,000 | 2,473,000,000 |
New Zealand |  |  |  |  |  |  |  |  |  |  |  |
Geographic Operating Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  | 104,000,000 | 111,000,000 | 87,000,000
Operating Income (Loss) |  |  |  |  |  |  |  |  |  | 2,000,000 | 6,000,000 | 14,000,000
Assets | 101,000,000 |  |  |  | 95,000,000 |  |  |  |  | 101,000,000 | 95,000,000 |
All other countries |  |  |  |  |  |  |  |  |  |  |  |
Geographic Operating Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Income (Loss) |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Assets | $ 0 |  |  |  | $ 1,000,000 |  |  |  |  | $ 0 | $ 1,000,000 |
[1] | Fourth quarter 2011 included a pre-tax expense of $6.5 million ($4.1 million after tax) due to an increase in a disposition reserve.

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