|
Fair Value (Details) (USD $)
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6 Months Ended | 6 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2012
Cash Flow Hedges
derivative
|
Jun. 30, 2011
Cash Flow Hedges
|
Jun. 30, 2012
Cash Flow Hedges
Interest Rate Caps
|
Jun. 30, 2012
Cash Flow Hedges
Interest Rate Swaps
|
Jun. 30, 2011
Fair Value Hedges
|
Dec. 31, 2011
Fair Value Hedges
derivative
|
Jun. 30, 2012
Non-Designated Hedges
derivative
|
Jun. 30, 2012
Non-Designated Hedges
Interest Rate Caps
|
|
| Derivative instruments and Hedging Activities | ||||||||
| Notional balance | $ 180,195,000 | $ 430,000,000 | $ 42,747,000 | |||||
| Weighted average interest rate (as a percent) | 2.40% | 4.50% | 1.20% | |||||
| Weighted average capped interest rate (as a percent) | 5.30% | 7.30% | ||||||
| Number of derivative instruments held | 6 | 2 | 3 | |||||
| Amount of increase (decrease) in comprehensive income to adjust hedging derivatives | $ (16,789,000) | $ (19,420,000) | $ 863,000 | |||||