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Financial Instruments: Derivatives and Hedging (Details) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended
Sep. 27, 2012
Feb. 28, 2011
Dec. 31, 2012
Dec. 31, 2011
Financial Instruments: Derivatives and Hedging        
Unrealized gains or losses on derivative financial instruments in accumulated other comprehensive income       $ 983,000
Payment to terminate interest rate swap       983,000
Interest Rate Swap
        
Financial Instruments: Derivatives and Hedging        
Term pursuant to interest rate swap agreement 5 years      
Notional Value     400,000,000  
Strike Rate (as a percent)     0.75%  
Fair Value     (1,219,000)  
Unrealized gains or losses on derivative financial instruments in accumulated other comprehensive income     1,200,000  
Amount estimated to be reclassified into earnings within next 12 months     300,000  
Payment to terminate interest rate swap   983,000    
Interest amortization reclassified from accumulated other comprehensive income into interest expense       983,000
Effective portion of the loss on outstanding derivative recognized in Other Comprehensive Income       $ 983,000