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Income Taxes (Reconciliation of the differences between PRC statutory income tax rate and the Group's effective income tax rate for PRC operations) (Details) - PRC [Member]
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Income Taxes [Line Items]      
Statutory income tax rate 25.00% 25.00% 25.00%
Permanent differences (9.30%) (2.70%) (1.70%)
Change in valuation allowance 7.80% (0.90%) 0.40%
Effect of preferential tax benefits (11.40%) (6.30%) (11.50%)
Uncertain tax positions 3.80% 0.90% 1.30%
Effective income tax rate 15.90% 16.00% 13.50%