Income Tax Provision (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Income Tax Provision [Abstract]
Income tax expense	$ 618,000	$ 4,835,000
Effective tax rate	10.00%	19.00%	16.00%
Domestic pre-tax income	(7,000,000)	(6,000,000)
Foreign pre-tax income	13,000,000	31,000,000
Tax holidays	2,000,000	2,000,000
Tax holidays basic EPS	$ 0.04	$ 0.05
Tax holidays diluted EPS	$ 0.04	$ 0.05
Unrecognized tax benefits	$ 10,000,000