BUSINESS COMBINATIONS QUANTUM RESEARCH GROUP (DETAILS) (USD $)	1 Months Ended		12 Months Ended
	Mar. 31, 2010	Mar. 31, 2008	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Business Acquisition [Line Items]
Goodwill			$ 104,430,000	$ 67,662,000
Quantum Research Group Ltd.
Business Acquisition [Line Items]
Amortization of intangible assets			4,075,000	4,192,000	4,466,000
Goodwill			54,800,000	54,300,000
Business Acquisition, Agreed Compensation Period		3 years
Business Acquisition, Maximum Executive Compensation Payable in Cash		15,100,000
Business Acquisition, Executive Compensation Payable in Shares, Number of Shares		5,300,000
Business Acquisition, Executive Compensation Payable in Shares, Value of Shares		17,300,000
Common stock issued to former employees of Quantum (See Note 3) (in shares)	3,200,000
Stock Issued During Period, Shares, Share-based Compensation, Forfeited	2,200,000
Business Acquisition, Reversal of Previous Share Based Compensation Expense Due to Forfeitures					4,500,000
Business Acquisition, Cash Compensation Payments					$ 3,800,000