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Severance Reserve (Details) (Employee Severance [Member], USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Employee Severance [Member]
   
Restructuring Cost and Reserve [Line Items]    
Balance at beginning of year $ 1,282 $ 3,062
Charged to earnings 6,770 1,210
Cash paid (1,672) (2,062)
Balance at end of the period $ 6,380 $ 2,210