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Commitments And Contingencies (Leases) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Mar. 31, 2007
Commitments and Contingencies Disclosure [Abstract]        
Operating Leases, 2012 $ 14,931,000      
Operating Leases, 2013 11,202,000      
Operating Leases, 2014 7,810,000      
Operating Leases, 2015 6,487,000      
Operating Leases, 2016 3,626,000      
Operating Leases, Thereafter 5,557,000      
Operating Leases, Future Minimum Payments Due, Total 49,613,000      
Minimum Sublease Income, 2012 309,000      
Minimum Sublease Income, 2013 139,000      
Minimum Sublease Income, 2014 0      
Minimum Sublease Income, 2015 0      
Minimum Sublease Income, 2016 0      
Minimum Sublease Income, Thereafter 0      
Minimum Sublease Income, Total minimum lease payments 448,000      
Operating Leases Net, 2012 14,622,000      
Operating Leases Net, 2013 11,063,000      
Operating Leases Net, 2014 7,810,000      
Operating Leases Net, 2015 6,487,000      
Operating Leases Net, 2016 3,626,000      
Operating Leases Net, Thereafter 5,557,000      
Operating Leases Net, Total minimum lease payments 49,165,000      
Rental expense 26,700,000 27,100,000 24,600,000  
Airplane Operating Lease Period Years       7 years
Airplane, fair value       22,100,000
Residual value guarantee liability $ 5,200,000     $ 14,100,000