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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) | 12 Months Ended
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Dec. 31, 2012 USD ($) | Dec. 31, 2012 GBP (£) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($)
Supplemental Schedule of Noncash Investing and Financing Activities |  |  |  |
Cash dividends declared, but not yet paid | $ 2,700,000 |  | $ 2,700,000 |
Issuance of equity awards to employees in grant | 2,700,000 |  | 1,500,000 |
Noncontrolling interest upon consolidation of joint venture |  |  | 600,000 |
Promissory notes issued for acquisition | 7,200,000 |  | 9,000,000 | 26,500,000
Equity issued for acquisition |  |  | 27,500,000 | 21,100,000
Reduction in promissory note payable related to a purchase price adjustment |  |  | 1,400,000 |
Current liability and other investments recorded related to contingent consideration | 16,300,000 | 10,000,000 |  |
Extinguishment of receivables related to acquisition |  |  |  | 6,400,000
Extinguishment of receivables related to funding arrangement |  |  |  | 3,300,000
Assets acquired, net of cash | 366,230,000 |  | 208,419,000 | 365,890,000
Liabilities assumed | $ 151,816,000 |  | $ 54,296,000 | $ 127,642,000

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