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Fair Value Measurements (Narrative) (Details) (USD $)
Sep. 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 620,755,000 638,112,000
Fixed Interest Rate [Member]
   
Debt Instrument [Line Items]    
Long-term Debt gross 351,782,000  
Long-term Debt, Fair Value 360,995,000  
Variable Interest Rate [Member]
   
Debt Instrument [Line Items]    
Long-term Debt gross 268,973,000  
Long-term Debt, Fair Value $ 268,973,000