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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
participant
item
Dec. 31, 2012
Defined contribution plan    
Employer contribution to the plan $ 1,900  
Pension Plan
    
Employee benefit plans    
Minimum age for eligibility under the Pension Plan 21  
Minimum period of service for eligibility under the Pension Plan 5 years  
Normal retirement benefit (as a percent) 2.00%  
Number of highest consecutive years' average earnings used in computing retirement benefit 5 years  
Maximum number of years of credited service considered in determining retirement benefit 40 years  
Number of participants in the Pension Plan 985  
Defined contribution plan    
Percentage of participant's eligible pay contributed to the plan by the employer 5.25%  
Eligibility for employer matching contributions, period of service 3 years  
Employer contribution to the plan $ 394 $ 254