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Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Intangible assets included operating costs and expenses        
Cost of net revenues $ 79,195 $ 91,839 $ 158,357 $ 147,629
General and administrative expenses 5,702 5,714 11,236 10,307
Total amortization expenses 227 527 664 1,055
Intangible Assets, Amortization Period [Member]
        
Intangible assets included operating costs and expenses        
Cost of net revenues 289 1,120 1,250 2,439
General and administrative expenses 227 527 664 1,055
Total amortization expenses $ 516 $ 1,647 $ 1,914 $ 3,494