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Equipment and Leasehold Improvements (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equipment and Leasehold Improvements [Abstract]      
Depreciation and amortization expense $ 4,900,000 $ 8,600,000 $ 6,000,000
Property, Plant and Equipment [Line Items]      
Equipment and leasehold improvements 28,549,000 43,912,000  
Less accumulated depreciation and amortization 18,105,000 31,623,000  
Equipment and leasehold improvements, net 10,444,000 12,289,000  
Equipment [Member]
      
Property, Plant and Equipment [Line Items]      
Equipment and leasehold improvements 25,597,000 41,447,000  
Leasehold Improvements [Member]
      
Property, Plant and Equipment [Line Items]      
Equipment and leasehold improvements $ 2,952,000 $ 2,465,000