|**Fair Value Measurements and Disclosures Concentration of Risk (Details) (USD $)**                                                                    | Sep. 30, 2013                                                             
|------------------------------------------------------------------------------------------------------------------------------------------------------ | --------------------------------------------------------------------------
|**Concentration Risk [Line Items]**                                                                                                                    |                                                                           
|Fair Value of Derivative Assets                                                                                                                        | $ 15,582,000                                                              
|Number of derivative counterparties not lenders in our revolving credit facility                                                                       | 20                                                                        
|JPMorgan Chase Bank                                                                                                                                    |                                                                           
|**Concentration Risk [Line Items]**                                                                                                                    |                                                                           
|Fair Value of Derivative Assets                                                                                                                        | 4,163,000                                                                 
|Wells Fargo Bank                                                                                                                                       |                                                                           
|**Concentration Risk [Line Items]**                                                                                                                    |                                                                           
|Fair Value of Derivative Assets                                                                                                                        | 3,830,000                                                                 
|Natixis                                                                                                                                                |                                                                           
|**Concentration Risk [Line Items]**                                                                                                                    |                                                                           
|Fair Value of Derivative Assets                                                                                                                        | 1,637,000                                                                 
|Bank of Montreal                                                                                                                                       |                                                                           
|**Concentration Risk [Line Items]**                                                                                                                    |                                                                           
|Fair Value of Derivative Assets                                                                                                                        | 1,885,000                                                                 
|BNP Paribas                                                                                                                                            |                                                                           
|**Concentration Risk [Line Items]**                                                                                                                    |                                                                           
|Fair Value of Derivative Assets                                                                                                                        | 1,285,000                                                                 
|Other Lenders in Our Credit Facility                                                                                                                   |                                                                           
|**Concentration Risk [Line Items]**                                                                                                                    |                                                                           
|Fair Value of Derivative Assets                                                                                                                        | 2,624,000                                                                 
|Various                                                                                                                                                |                                                                           
|**Concentration Risk [Line Items]**                                                                                                                    |                                                                           
|Fair Value of Derivative Assets                                                                                                                        | $ 158,000                                                                 
|                                                                                                                                                      
|[1]
              Major lender in our revolving credit facility. See Note 7, Long-Term Debt.[2]
              Represents a total of 20 counterparties. | [1]                                                                       
|[1]                                                                                                                                                    | Major lender in our revolving credit facility. See Note 7, Long-Term Debt.
|[2]                                                                                                                                                    | Represents a total of 20 counterparties.                                  

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