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Net Earnings Per Common Share Computation of Basic and Diluted Net Earnings Per Common Share (Details) (USD $)
In Thousands, except Per Share data, 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
Earnings Per Share [Abstract]                      
Income (Loss) from Continuing Operations, Per Diluted Share $ (0.34) $ 0.04 $ (0.14) $ 0.18 $ (1.25) $ 0.28 $ 0.23 $ 0.14 $ (0.26) $ (0.58) $ 0.35
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share $ 0.11 $ 0.05 $ 0.07 $ 0.08 $ 0.15 $ 0.12 $ 0.09 $ 0.08 $ 0.32 $ 0.45 $ 0.42
Income (Loss) from Continuing Operations, Per Basic Share $ (0.34) $ 0.04 $ (0.14) $ 0.18 $ (1.25) $ 0.28 $ 0.24 $ 0.15 $ (0.26) $ (0.58) $ 0.36
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share $ 0.11 $ 0.05 $ 0.07 $ 0.08 $ 0.15 $ 0.12 $ 0.10 $ 0.09 $ 0.32 $ 0.45 $ 0.42
Income (Loss) from Continuing Operations Attributable to Parent $ (10,777) $ 1,208 $ (4,305) $ 5,605 $ (39,678) $ 8,891 $ 7,579 $ 4,690 $ (8,269) $ (18,518) $ 11,604
Basic                      
Average common shares outstanding                 31,641 31,958 32,393
Net Earnings (loss) (7,295) 2,864 (1,977) 8,235 (35,028) 12,800 10,661 7,454 1,827 (4,113) 25,341
Net earnings per common share $ (0.23) $ 0.09 $ (0.06) $ 0.26 $ (1.10) $ 0.40 $ 0.33 $ 0.23 $ 0.06 $ (0.13) $ 0.78
Diluted                      
Average common shares outstanding                 31,641 31,958 32,393
Shares related to convertible debt                 0 0 163
Stock options and awards                 230 397 138
Average common shares assuming dilution                 31,871 32,355 32,694
Net Earnings (loss) (7,295) 2,864 (1,977) 8,235 (35,028) 12,800 10,661 7,454 1,827 (4,113) 25,341
Net Earnings (loss) per Share - Assuming Dilution $ (0.23) $ 0.09 $ (0.06) $ 0.26 $ (1.10) $ 0.40 $ 0.32 $ 0.23 $ 0.06 $ (0.13) $ 0.78
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent $ 3,482 $ 1,656 $ 2,328 $ 2,630 $ 4,650 $ 3,909 $ 3,082 $ 2,764 $ 10,096 $ 14,405 $ 13,737