|**Fair Value Measurements and Disclosures Concentration of Risk (Details) (USD $)**                                                                    | Mar. 31, 2014                                                             
|------------------------------------------------------------------------------------------------------------------------------------------------------ | --------------------------------------------------------------------------
|**Concentration Risk [Line Items]**                                                                                                                    |                                                                           
|Fair Value of Derivative Assets                                                                                                                        | $ 3,393,000                                                               
|Number of derivative counterparties not lenders in our revolving credit facility                                                                       | 30                                                                        
|Wells Fargo Bank [Member]                                                                                                                              |                                                                           
|**Concentration Risk [Line Items]**                                                                                                                    |                                                                           
|Fair Value of Derivative Assets                                                                                                                        | 904,000                                                                   
|Bank of Montreal [Member]                                                                                                                              |                                                                           
|**Concentration Risk [Line Items]**                                                                                                                    |                                                                           
|Fair Value of Derivative Assets                                                                                                                        | 716,000                                                                   
|Bank of Nova Scotia [Member]                                                                                                                           |                                                                           
|**Concentration Risk [Line Items]**                                                                                                                    |                                                                           
|Fair Value of Derivative Assets                                                                                                                        | 425,000                                                                   
|JPMorgan Chase Bank [Member]                                                                                                                           |                                                                           
|**Concentration Risk [Line Items]**                                                                                                                    |                                                                           
|Fair Value of Derivative Assets                                                                                                                        | 380,000                                                                   
|Other Lenders in Our Credit Facility [Member]                                                                                                          |                                                                           
|**Concentration Risk [Line Items]**                                                                                                                    |                                                                           
|Fair Value of Derivative Assets                                                                                                                        | 756,000                                                                   
|Various [Member]                                                                                                                                       |                                                                           
|**Concentration Risk [Line Items]**                                                                                                                    |                                                                           
|Fair Value of Derivative Assets                                                                                                                        | $ 212,000                                                                 
|                                                                                                                                                      
|[1]
              Major lender in our revolving credit facility. See Note 7, Long-Term Debt.[2]
              Represents a total of 30 counterparties. | [1]                                                                       
|[1]                                                                                                                                                    | Major lender in our revolving credit facility. See Note 7, Long-Term Debt.
|[2]                                                                                                                                                    | Represents a total of 30 counterparties.                                  

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