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Financial Instruments - Notional Amounts (Details) (Interest rate swaps, USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Interest rate swaps
   
Derivatives designated as cash flow hedges:    
Notional Amount $ 75,000 $ 75,000
Fair Value, Asset 0 0
Fair Value, Liability $ 541 [1] $ 1,619 [1]
[1] (1) Balance recorded in "Other liabilities"