| **Fair Value Measurements and Disclosures Concentration of Risk (Details) $ in Thousands** | Jun. 30, 2015 USD ($) |
|--------------------------------------------------------------------------------------------|-----------------------|
| **Concentration Risk [Line Items]**                                                        |                       |   |
| Fair Value of Derivative Assets                                                            |                       | $ 225,779 |
| Canadian Imperial Bank of Commerce [Member]                                                |                       |   |
| **Concentration Risk [Line Items]**                                                        |                       |   |
| Fair Value of Derivative Assets                                                            | [1]                   | 53,050 |
| JPMorgan Chase Bank [Member]                                                               |                       |   |
| **Concentration Risk [Line Items]**                                                        |                       |   |
| Fair Value of Derivative Assets                                                            | [1]                   | 63,200 |
| Wells Fargo Bank [Member]                                                                  |                       |   |
| **Concentration Risk [Line Items]**                                                        |                       |   |
| Fair Value of Derivative Assets                                                            | [1]                   | 34,072 |
| Natixis [Member]                                                                           |                       |   |
| **Concentration Risk [Line Items]**                                                        |                       |   |
| Fair Value of Derivative Assets                                                            | [1]                   | 28,169 |
| Bank of Nova Scotia [Member]                                                               |                       |   |
| **Concentration Risk [Line Items]**                                                        |                       |   |
| Fair Value of Derivative Assets                                                            | [1]                   | 26,938 |
| Key Bank [Member]                                                                          |                       |   |
| **Concentration Risk [Line Items]**                                                        |                       |   |
| Fair Value of Derivative Assets                                                            | [1]                   | 14,962 |
| Other Lenders in Our Credit Facility [Member]                                              |                       |   |
| **Concentration Risk [Line Items]**                                                        |                       |   |
| Fair Value of Derivative Assets                                                            |                       | $ 5,388 |
|                                                                                            |
| [1]Major lender in our revolving credit facility. See Note 7, Long-Term Debt.              |

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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 15 -Paragraph 83 -URI http://asc.fasb.org/extlink&oid=39740004&loc=d3e34841-113949
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| X                                                                                                                                                                                         |
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