| **Derivative Financial Instruments - Effect of Derivative Financial Instruments on Income Statement (Details) (USD $)In Thousands, unless otherwise specified** | 3 Months Ended | 9 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|----------------|
||
| Not Designated as Hedging Instrument | Interest rate contracts | Other Income                                                                                   |           |           |   |   |
| **Derivative [Line Items]**                                                                                                                                     |           |           |   |   |
| Amount of Gain (Loss) Recognized Income on Derivative                                                                                                           | $ (16)         | $ (70)         | $ 249 | $ (125) |
| Designated as Hedging Instrument | Cash Flow Hedging | Interest expense                                                                                         |           |           |   |   |
| **Derivative [Line Items]**                                                                                                                                     |           |           |   |   |
| Amount of Gain (Loss) Reclassified from Other Comprehensive Income into Income (Effective Portion)                                                              | (207)          |           | (587) |   |
| Designated as Hedging Instrument | Cash Flow Hedging | Interest rate contracts                                                                                  |           |           |   |   |
| **Derivative [Line Items]**                                                                                                                                     |           |           |   |   |
| Amount of Gain Recognized in Other Comprehensive Income on Derivative (Effective Portion)                                                                       | $ (248)        | $ (376)        | $ 1,550 | $ (1,529) |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.
+ References
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| X                                                                                                                                                       |
|---------------------------------------------------------------------------------------------------------------------------------------------------------|
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