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Employee Benefit Plans (Details 7) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Defined Benefit Plan, Fair Value of Plan Assets $ 26,868 $ 24,769 $ 25,045
Corporate Bond Securities [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 6,215 6,426  
Mutual Funds [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 8,172 7,173  
Foreign Stock [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 635 545  
Common Stock [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 9,826 9,981  
Fair Value, Inputs, Level 1 [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 18,739 17,781  
Fair Value, Inputs, Level 1 [Member] | Corporate Bond Securities [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 8,172 7,173  
Fair Value, Inputs, Level 1 [Member] | Foreign Stock [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 635 545  
Fair Value, Inputs, Level 1 [Member] | Common Stock [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 9,826 9,981  
Fair Value, Inputs, Level 2 [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 8,129 6,988  
Fair Value, Inputs, Level 2 [Member] | Corporate Bond Securities [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 6,215 6,426  
Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Foreign Stock [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Common Stock [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Corporate Bond Securities [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Mutual Funds [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Foreign Stock [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 0     
Fair Value, Inputs, Level 3 [Member] | Common Stock [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 0 0  
Money Market Funds [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 2,020 644  
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 106 82  
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets 1,914 562  
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
     
Defined Benefit Plan, Fair Value of Plan Assets $ 0 $ 0