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Employee Benefit Plans (Details 6) (Pension Plan, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Pension Plan
 
Year ending December 31, 2013 $ 723
Year ending December 31, 2014 860
Year ending December 31, 2015 968
Year ending December 31, 2016 1,160
Year ending December 31, 2017 1,302
Years ending December 31, 2018-2022 $ 9,013