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Financial Instruments (Details) (Recurring [Member], USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Restricted investments:    
Guaranteed Investment Contract $ 5,742 $ 5,742
Rabbi Trust 11,066 9,534
Fixed income securities 2,076 1,993
Liabilities:    
Interest rate swap derivative liabilities 361 390
Quoted Prices in Active Markets (Level 1)
   
Restricted investments:    
Guaranteed Investment Contract 0 0
Rabbi Trust 0 0
Fixed income securities 0 0
Liabilities:    
Interest rate swap derivative liabilities 0 0
Significant Other Observable Inputs (Level 2)
   
Restricted investments:    
Guaranteed Investment Contract 5,742 5,742
Rabbi Trust 11,066 9,534
Fixed income securities 2,076 1,993
Liabilities:    
Interest rate swap derivative liabilities 361 390
Significant Unobservable Inputs (Level 3)
   
Restricted investments:    
Guaranteed Investment Contract 0 0
Rabbi Trust 0 0
Fixed income securities 0 0
Liabilities:    
Interest rate swap derivative liabilities $ 0 $ 0