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Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Intangible assets included operating costs and expenses        
Cost of net revenues $ 56,371 $ 86,573 $ 214,728 $ 234,202
General and administrative expenses 4,825 6,243 16,061 16,550
Total amortization expenses 227 644 891 1,699
Intangible Assets, Amortization Period [Member]
       
Intangible assets included operating costs and expenses        
Cost of net revenues 289 705 1,539 3,144
General and administrative expenses 227 644 891 1,699
Total amortization expenses $ 516 $ 1,349 $ 2,430 $ 4,843