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Accounts Receivable, Net (Allowance for Doubtful Accounts) (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Accounts Receivable, Net [Abstract]        
Balance as of January 1 ¥ 58,846 $ 8,476 ¥ 23,767 ¥ 20,584
Additional provision charged to bad debt expenses 47,762 6,879 46,990 9,229
Write-off of bad debt provision (15,260) (2,198) (11,911) (1,526)
Attributable to disposal of a subsidiary 0 0 0 (4,520)
Balance as of December 31 ¥ 91,348 $ 13,157 ¥ 58,846 ¥ 23,767