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Lease Obligations (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2010
Facility Closing
Jun. 30, 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%   3.00%          
Percentage of increase in annual base rent, maximum 3.50%   3.50%          
Lease exit costs $ 136,000 $ 44,000 $ 340,000 $ 132,000   $ 9,700,000 $ 4,300,000 $ 5,900,000
Property and equipment write-off           5,400,000    
Rent expense, net sublease income 900,000 900,000 1,800,000 1,900,000        
Adjustment for accretion and changes in lease assumptions 100,000 200,000            
Rent expense   200,000 400,000          
Deferred rent $ 343,000   $ 343,000   $ 350,000