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Fair Value Measurements (Narrative) (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Fair Value Measurements    
Business Acquisition, Preacquisition Contingency, Amount of Settlement $ 2,744,000  
Debt Instrument [Line Items]    
Long-term Debt gross 616,036,000 638,112,000
Fixed Interest Rate [Member]
   
Debt Instrument [Line Items]    
Long-term Debt gross 352,685,000  
Long-term Debt, Fair Value 360,921,000  
Variable Interest Rate [Member]
   
Debt Instrument [Line Items]    
Long-term Debt gross 263,351,000  
Long-term Debt, Fair Value $ 263,351,000