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Long-Term Debt and Interest Expense (Narrative) (Details) - USD ($)
Apr. 21, 2015
Sep. 30, 2015
Apr. 20, 2015
Debt Instrument [Line Items]      
Line of credit facility, current borrowing capacity     $ 300,000,000
Modified Facility [Member]      
Debt Instrument [Line Items]      
Borrowings   $ 0  
Letters of credit outstanding under the Credit Agreement   50,300,000  
Line of credit facility, current borrowing capacity $ 250,000,000    
Available borrowing capacity   $ 111,000,000  
Maximum | Modified Facility [Member]      
Debt Instrument [Line Items]      
Aggregate commitments outstanding, percentage 25.00%    
Aggregate commitments outstanding, Value $ 62,500,000    
Leverage ratio 250.00%    
Coverage ratio 100.00%