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Lease Obligations (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Operating Leased Assets [Line Items]          
Lease expiration year, minimum     2016    
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 $ 345 $ 182 $ 786 $ 522  
Rent expense, net sublease income 800 800 2,700 2,600  
Adjustment for accretion and changes in lease assumptions $ 300 $ 200 800 $ 400  
Contract Termination          
Operating Leased Assets [Line Items]          
Lease exit costs     $ 1,300   $ 3,300