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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.