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Derivative Instruments (Details) (USD $)
12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2010
Sep. 28, 2009
Sep. 30, 2004
Dec. 31, 2010
Other Liabilities [Member]
Dec. 31, 2009
Other Liabilities [Member]
Dec. 31, 2010
Realized Loss [Member]
Interest Rate Swap [Member]
Cash Flow Hedging [Member]
Dec. 31, 2009
Realized Loss [Member]
Interest Rate Swap [Member]
Cash Flow Hedging [Member]
Dec. 31, 2008
Realized Loss [Member]
Interest Rate Swap [Member]
Cash Flow Hedging [Member]
Dec. 31, 2010
Interest Expense [Member]
Interest Rate Swap [Member]
Cash Flow Hedging [Member]
Dec. 31, 2008
Interest Expense [Member]
Interest Rate Swap [Member]
Cash Flow Hedging [Member]
Dec. 31, 2009
Interest Expense [Member]
Cash Flow Hedging [Member]
Sep. 28, 2009
Interest Rate Swap [Member]
Sep. 30, 2004
Interest Rate Swap [Member]
Dec. 31, 2010
Interest Rate Swap [Member]
Cash Flow Hedging [Member]
Dec. 31, 2009
Interest Rate Swap [Member]
Cash Flow Hedging [Member]
Dec. 31, 2008
Interest Rate Swap [Member]
Cash Flow Hedging [Member]
Sep. 30, 2010
August 2009 Swap [Member]
Sep. 30, 2010
September 2009 Swap [Member]
Fair value of derivative instruments                                    
Cash flow hedge interest rate swaps       $ 482,000 $ 2,381,000                          
Impact of derivative instruments on the statement of operations and OCI                                    
Gain (loss) on interest rate swap recognized in OCI (effective portion)                           (10,307,000) (3,513,000) 7,669,000    
Gain (loss) reclassified from AOCI into income (effective portion)                 (2,244,000) (160,000) (971,000)              
Gain (loss) recognized in income (ineffective portion and amount excluded from effectiveness testing)           0 0 (23,393,000)                    
Derivative Instruments (Textuals) [Abstract]                                    
Hedging losses included in accumulated other comprehensive income 1,643,000                                  
Notional amount of interest rate swap 12,650,000                     48,155,000 52,198,000          
Term of interest payments Hedged 7 Years                                  
Cash payment for termination interest rate swap                                 6,645,000 4,365,000
Interest Rate swap Effective Date Sep. 30, 2009 Aug. 12, 2009
Interest Rate swap maturity Date Oct. 01, 2016 Sep. 01, 2016
Amount of long-term debt to be offset by Interest rate Cash Flow Hedge $ 12,650,000 $ 48,155,000 $ 52,198,000                              
Fixed rate of swap 0.0550                     0.032675 0.0393