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Consolidated Statements Of Cash Flows (USD $)
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Cash flows from operating activities:  
Net income$ 27,591,000$ 25,318,000
Adjustments to reconcile net income to net cash provided by operating activities:  
Depreciation and amortization3,123,0002,725,000
Bad debt provision2,100,0001,550,000
Change in deferred income taxes(774,000)(2,685,000)
Share-based compensation expense1,630,000947,000
Amortization of premium on marketable securities735,000623,000
Unrealized loss on marketable securities377,000849,000
Unrealized (gain) loss on deferred compensation fund investments984,000(476,000)
Changes in operating assets and liabilities:  
Accounts and notes receivable(10,967,000)(5,557,000)
Inventories and supplies(1,582,000)(1,883,000)
Prepaid income taxes2,843,000 
Prepaid expenses and other assets(1,177,000)1,809,000
Notes receivable - long term portion2,613,000(1,461,000)
Deferred compensation funding(1,291,000)(1,250,000)
Accounts payable and other accrued expenses(1,664,000)(2,529,000)
Accrued payroll, accrued and withheld payroll taxes(8,484,000)(8,499,000)
Income taxes payable 180,000
Accrued insurance claims2,623,0003,960,000
Deferred compensation liability707,0002,055,000
Net cash provided by operating activities19,387,00015,676,000
Cash flows from investing activities:  
Proceeds from disposals of fixed assets20,00044,000
Additions to property and equipment(4,431,000)(2,537,000)
Purchases of marketable securities(17,276,000)(33,963,000)
Sales of marketable securities18,877,00040,792,000
Cash paid for acquisition(1,000,000) 
Net cash provided by (used in) investing activities(3,810,000)4,336,000
Cash flows from financing activities:  
Dividends paid(31,494,000)(29,025,000)
Reissuance of treasury stock pursuant to Dividend Reinvestment Plan98,00089,000
Tax benefit from equity compensation plans1,175,0001,262,000
Proceeds from the exercise of stock options2,080,0002,470,000
Net cash used in financing activities(28,141,000)(25,204,000)
Net decrease in cash and cash equivalents(12,564,000)(5,192,000)
Cash and cash equivalents at beginning of the period39,692,00031,301,000
Cash and cash equivalents at end of the period27,128,00026,109,000
Supplementary Cash Flow Information:  
Income taxes cash payments, net of refunds11,440,00015,607,000
Issuance of 76,000 and 73,000 shares in 2011 and 2010, respectively, of Common Stock pursuant to Employee Stock Plans$ 1,233,000$ 1,047,000