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Summary of Significant Accounting Policies (Details Textual) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Customer
Dec. 31, 2011
Dec. 31, 2010
Summary of Significant Accounting Policies (Additional Textual) [Abstract]      
Major customer revenue 1 billion-plus    
Original maturities 90 days    
Number of customers accounted for revenues or accounts receivable greater than 2% of total 0    
Percentage of revenue represent by single customer maximum threshold 2.00%    
Annual goodwill impairment test, period November 30    
Non-current deferred rent liabilities $ 6,936,000 $ 6,671,000  
Foreign exchange losses 400,000 1,300,000 1,400,000
Remeasurement gains on deferred tax liability 100,000 100,000 400,000
Special dividend declared per common share     $ 3.00
Unamortized fair value stock based compensation 9,000,000    
Weighted average remaining recognition period 1 year 10 months 24 days    
Indefinite-lived intangible assets $ 0    
Stock Options [Member]
      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Options to purchase shares 0.8 0.3 0.4