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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