Income Tax (Details 1) (PRC [Member])	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
PRC [Member]
Summary of the income tax rates for PRC subsidiaries
PRC statutory rate	25.00%	25.00%	25.00%	25.00%
Non-taxable or non-deductible items	(2.30%)	(1.80%)	(1.90%)	(1.90%)
Effect of foreign income tax rates	(8.50%)	(16.50%)	(7.90%)	(7.60%)
Income tax exemption		(0.10%)	0.10%	(0.10%)
Other	(2.20%)	2.10%	0.60%	0.10%
Effective income tax rate	12.00%	8.70%	15.90%	15.50%