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Bank and Other Notes Payable: (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Future maturities of bank and other notes payable    
Bank and other notes payable $ 877,636 $ 632,595
Bank and other notes payable
   
Future maturities of bank and other notes payable    
2012 440,139  
2013 24,027  
2016 290,000  
Thereafter 125,000  
Long term debt including debt premium 879,166  
Debt discounts (1,530)  
Bank and other notes payable $ 877,636