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Income Tax Components of income tax (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income (loss) from continuing operations before income taxes      
United States $ (34,690) $ (5,100) $ 14,269
Canada (9,290) (976) 2,427
Income (loss) from continuing operations before income taxes (43,980) (6,076) 16,696
Current income tax expense (benefit):      
U.S. Federal 62 464 3,681
U.S. state 215 295 987
Canada 1,016 (190) 366
Total 1,293 569 5,034
Deferred income tax expense (benefit):      
U.S. Federal 16,159 (2,187) 1,648
U.S. state 1,160 (155) 217
Canada 125 86 207
Total 17,444 (2,256) 2,072
Total income tax expense (benefit):      
U.S. Federal 16,221 (1,723) 5,329
U.S. state 1,375 140 1,204
Canada 1,141 (104) 573
Total $ 18,737 $ (1,687) $ 7,106