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Derivatives (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Derivatives          
Deferred losses included in AOCI (pretax) $ 13,425   $ 13,425   $ 15,932
Interest rate swaps
         
Derivatives          
Deferred losses included in AOCI (pretax) 13,400   13,400   15,900
Interest rate swaps | Cash flow hedges
         
Derivatives          
Loss/(gain) recognized in accumulated other comprehensive income (loss) ("AOCI") (581) (953) (1,584) (5,614)  
Loss/(gain) arising from ineffectiveness increasing/(reducing) interest expense (15) (24) (31) (59)  
Deferred losses/(gains) reclassed from AOCI to interest expense (14) 402 (1) 885  
Fair value of derivatives     13,443   15,981
Deferred losses included in AOCI (pretax) 13,425   13,425   15,932
Losses included in AOCI to be recognized in the next 12 months     41   65
Number of months over which loss in OCI is to be recognized     9 months   15 months
Current derivatives | Cash flow hedges
         
Derivatives          
Aggregate notional value of derivatives outstanding 630,000   630,000   530,000
Forward derivatives | Cash flow hedges
         
Derivatives          
Aggregate notional value of derivatives outstanding $ 175,000   $ 175,000   $ 200,000