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Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Change in Projected Benefit Obligation          
Projected benefit obligation, beginning of period     $ 20,032 $ 19,761 $ 19,761
Service cost 205 231 409 462 925
Interest cost 234 207 468 415 829
Actuarial gain     0   (1,229)
Benefits paid     (141)   (254)
Projected benefit obligation, end of period 20,768   20,768   20,032
Change in Plan Assets          
Plan assets at fair value, beginning of period     0 0 0
Company contributions     141   254
Benefits paid     (141)   (254)
Plan assets at fair value, end of period 0   0   0
Unfunded Status of the Plan $ (20,768)   $ (20,768)   $ (20,032)