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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Consolidated Statements of Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 10,412 |  | $ 1,300 | $ 23,500 | $ 15,047 |  | $ 1,700 | $ (13,800) | [1] | $ (3,700) | $ (9,900) | $ (19,000) | [2] | $ 91,248 |  | $ 16,715 |  | $ 41,496 | $ (46,363) | $ (33,297)
Defined benefit pension plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of actuarial loss | 1,411 |  |  |  | 1,958 |  |  |  |  |  |  |  |  | 2,806 |  | 3,984 |  | 7,632 | 2,703 | 556
Amortization of prior service costs and other | 14 |  |  |  | 42 |  |  |  |  |  |  |  |  | 28 |  | 83 |  | 416 | 175 | 178
Other comprehensive loss | 1,425 | [3] |  |  | 2,000 | [3] |  |  |  |  |  |  |  | 2,834 | [3] | 4,067 | [3] | (384) | (80,650) | (3,293)
Comprehensive income (loss) | $ 11,837 |  |  |  | $ 17,047 |  |  |  |  |  |  |  |  | $ 94,082 |  | $ 20,782 |  | $ 41,112 | $ (127,013) | $ (36,590)
[1] | Included $0.9 million in noncash asset write-downs.
[2] | Included $1.5 million of expense related to the closure of a laminated beam plant in Emmett, Idaho. Included $1.2 million in noncash asset write-downs.
[3] | Represents amounts reclassified from accumulated other comprehensive loss. These amounts are included in the computation of net periodic pension cost. For additional information, see Note 6, Retirement and Benefit Plans.

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