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CONSOLIDATED CASH FLOWS (Parenthetical)
 12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2009
GBP (£)
Supplemental Schedule of Noncash Investing and Financing Activities        
Cash dividends declared, but not yet paid $ 2,700,000 $ 2,600,000    
Capital expenditure accrual 900,000      
Issuance of equity awards to employees in grant     5,800,000  
Equity-based compensation current accrual 1,500,000   4,500,000  
Equity-based compensation noncurrent accrual     1,300,000  
Noncontrolling interest upon consolidation of joint venture 600,000      
Less: Promissory notes issued 9,028,000 26,500,000 4,300,000  
Equity issued for acquisition 27,500,000 21,100,000    
Reduction in promissory note payable related to a purchase price adjustment 1,400,000      
Extinguishment of receivables related to acquisition   6,400,000    
Extinguishment of receivables related to funding arrangement   3,300,000    
Long-term liability and goodwill related to Earn-out     6,200,000 4,200,000
Assets acquired, net of cash 208,419,000 365,890,000 71,225,000  
Liabilities assumed $ 54,296,000 $ 127,642,000 $ 13,287,000