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Benefit Plans (Details 3) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Activities for unvested stock option awards      
Weighted average Exercise Price, Ending balance $ 25.35 $ 28.28 $ 29.02
Weighted average Exercise Price, Beginning balance $ 28.28 $ 29.02 $ 41.97
Weighted-average grant-date fair value, granted $ 5.63 $ 5.30 $ 2.21
Nonvested Stock Option Awards [Member]
     
Activities for unvested stock option awards      
Number of Options Outstanding, Beginning Balance 323    
Weighted average Exercise Price, Ending balance $ 5.34    
Weighted average Exercise Price, Beginning balance $ 5.22    
Number of Options, Granted 276    
Weighted-average grant-date fair value, granted $ 5.42    
Number of options, vested (104)    
Weighted-average grant-date fair value, vested $ 5.23    
Number of Options, Forfeited (42)    
Weighted-average grant-date fair value, forfeited $ 5.23    
Number of Options Outstanding, Ending Balance 453