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Reserve for Severance Activity in reserve (Details) (Employee Severance [Member], USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Employee Severance [Member]
   
Reserve for severance and related payments    
Balance at beginning of period $ 1,769 $ 4,417
Charged to earnings 1,018 0
Cash paid (1,325) (986)
Balance at end of the period $ 1,462 $ 3,431