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Lines Of Credit (Details) (Line of Credit [Member])
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2013
2012 Credit Facility [Member]
USD ($)
Dec. 31, 2013
2012 Credit Facility [Member]
London Interbank Offered Rate (LIBOR) [Member]
Dec. 31, 2013
Canadian Subsidiary Credit Facility [Member]
CAD
Line of Credit Facility [Line Items]            
Debt Instrument, Term       5 years    
Credit facility       $ 300,000   2,000
Credit facility, expiration date       Feb. 02, 2017    
Credit facility interest accrued, percentage above LIBOR         1.25%  
Credit facility, commitment fee per annum on daily unused portion, percent       0.15%    
Aggregate amount that may increase under credit facility       100,000    
Interest Expense and Commitment Fees $ 458 $ 585 $ 1,478