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Related Party Transactions (Related Party Financial Information) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Related Party Transaction [Line Items]                      
Net sales $ 654,306 $ 670,824 $ 665,481 $ 629,500 $ 626,651 $ 642,764 $ 615,459 $ 550,732 $ 2,620,111 $ 2,435,606 $ 2,147,589
Gross profit (loss) 134,157 137,747 136,901 133,141 147,284 166,452 131,665 86,799 541,946 532,200 426,577
Net income (loss) 39,465 41,777 39,368 37,417 54,891 93,320 38,030 19,194 158,027 205,435 265,895
Southern Timber Venture, LLC [Member]
                      
Related Party Transaction [Line Items]                      
Net sales                 1,719 4,548 5,172
Gross profit (loss)                 (16,389) (1,219) (450)
Gain from sale of timberlands                   13,299   
Net income (loss)                 $ (22,387) $ 5,784 $ (5,912)