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Earnings (Loss) Before Income Taxes Composition in Each Tax Jurisdiction (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings (Loss) Before Income Taxes Composition in Each Tax Jurisdiction [Abstract]      
United States $ 38,900 $ 111,278 $ 72,156
Canada (666) 313 (1,236)
Earnings before income taxes $ 38,234 $ 111,591 $ 70,920