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Lease Obligations (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2010
Facility Closing
Mar. 31, 2014
Contract Termination
Dec. 31, 2013
Contract Termination
Operating Leased Assets [Line Items]            
Lease expiration year, minimum 2014          
Lease expiration year, maximum 2019          
Percentage of increase in annual base rent, minimum 3.00%          
Percentage of increase in annual base rent, maximum 3.50%          
Lease exit costs $ 204,000 $ 89,000   $ 9,700,000 $ 5,100,000 $ 5,900,000
Property and equipment write-off       5,400,000    
Rent expense, net sublease income 900,000 1,000,000        
Adjustment for accretion and changes in lease assumptions 200,000 100,000        
Rent expense 200,000 200,000        
Deferred rent $ 346,000 $ 400,000 $ 350,000