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Segment and Geographic Information (Details 4) (USD $)
In Thousands, unless otherwise specified
 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
Revenues from external customers and long lived assets                      
Net sales $ 391,389 $ 404,354 $ 384,693 $ 397,352 $ 391,905 $ 416,493 $ 397,985 $ 396,771 $ 1,577,788 $ 1,603,154 $ 1,455,331
Plant, equipment and timberlands, net 621,186       601,950       621,186 601,950 608,200
United States [Member]
                      
Revenues from external customers and long lived assets                      
Net sales                 952,195 933,357 880,089
Plant, equipment and timberlands, net 248,185       250,217       248,185 250,217 251,318
Germany [Member]
                      
Revenues from external customers and long lived assets                      
Net sales                 358,442 410,183 327,952
Plant, equipment and timberlands, net 191,559       181,537       191,559 181,537 198,585
United Kingdom [Member]
                      
Revenues from external customers and long lived assets                      
Net sales                 119,092 122,218 128,598
Plant, equipment and timberlands, net 59,131       57,634       59,131 57,634 55,672
Canada [Member]
                      
Revenues from external customers and long lived assets                      
Net sales                 106,702 88,018 75,195
Plant, equipment and timberlands, net 83,796       86,079       83,796 86,079 80,177
Other [Member]
                      
Revenues from external customers and long lived assets                      
Net sales                 41,357 49,378 43,497
Plant, equipment and timberlands, net $ 38,515       $ 26,483       $ 38,515 $ 26,483 $ 22,418