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Consolidated Statements of Cash Flows (Parenthetical) (USD $) | 9 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Supplemental Schedule of Noncash Investing and Financing Activities |  |
Cash dividends declared, but not yet paid | $ 2,600,000 | $ 2,700,000
Accrued capital expenditures |  | 2,800,000
Assets acquired, net of cash | 542,143,000 | 54,998,000
Liabilities assumed | 317,932,000 | 30,286,000
Promissory notes issued for acquisition | 9,000,000 | 3,000,000
Purchase price adjustment |  | $ 2,000,000

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