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Fair Value (Details) (USD $)
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12 Months Ended | 1 Months Ended | 12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2012
|
Dec. 31, 2012
Cash Flow Hedges
derivative
|
Dec. 31, 2011
Cash Flow Hedges
|
Dec. 31, 2010
Cash Flow Hedges
|
Dec. 31, 2012
Cash Flow Hedges
Interest Rate Caps
|
Sep. 30, 2012
Cash Flow Hedges
Interest Rate Swaps
|
Dec. 31, 2012
Cash Flow Hedges
Interest Rate Swaps
|
Dec. 31, 2011
Fair Value Hedges
derivative
|
Dec. 31, 2012
Non-Designated Hedges
derivative
|
Dec. 31, 2012
Non-Designated Hedges
Interest Rate Caps
|
|
| Derivative instruments and Hedging Activities | ||||||||||
| Notional balance | $ 179,851,000 | $ 215,000,000 | $ 39,347,000 | |||||||
| Weighted average interest rate (as a percent) | 2.40% | 4.60% | 1.10% | |||||||
| Weighted average capped interest rate (as a percent) | 5.30% | 7.40% | ||||||||
| Number of derivative instruments held | 5 | 2 | 3 | |||||||
| Payment for settlement of forward starting interest rate swap agreement | 54,930,000 | |||||||||
| Amount of increase in comprehensive loss to adjust hedging derivatives | 22,876,000 | 85,845,000 | 108,000 | |||||||
| Estimated hedging losses to be reclassified from accumulated other comprehensive loss into earnings within the next twelve months | 5,493,000 | |||||||||
| Fair value hedge derivative fair value decrease | 1,498,000 | |||||||||
| Hedging losses reclassified from accumulated other comprehensive loss into earnings | $ 1,889,000 | |||||||||