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Lease Obligations (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
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 $ 560,000 $ 1,022,000 $ 552,000
Rent expense, net sublease income 3,700,000 3,600,000  
Adjustment for accretion and changes in lease assumptions 600,000 1,000,000  
Tenant improvement allowance 3,200,000    
Rent expense 700,000 1,100,000 1,200,000
Deferred rent 350,000 334,000  
Contract Termination
      
Operating Leased Assets [Line Items]      
Lease exit costs $ 5,900,000 $ 9,000,000