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Consolidated Statements Of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income $ 38,156,000 $ 34,441,000 $ 30,342,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 4,387,000 3,764,000 3,229,000
Bad debt provision 2,450,000 2,200,000 2,404,000
Stock-based compensation expense 2,152,000 1,332,000 1,074,000
Amortization of premium on marketable securities 999,000 840,000 956,000
Unrealized (gain) loss on marketable securities 486,000 1,083,000 (505,000)
Unrealized (gain) loss on deferred compensation fund investments 104,000 (1,325,000) (1,797,000)
Changes in operating assets and liabilities:      
Accounts and notes receivable (24,769,000) (6,270,000) (10,202,000)
Prepaid income taxes 3,574,000 (4,014,000) 2,838,000
Inventories and supplies (4,531,000) (3,639,000) (620,000)
Notes receivable - long term 3,572,000 (432,000) (1,422,000)
Deferred compensation funding (1,804,000) 29,000 (700,000)
Accounts payable and other accrued expenses (1,079,000) 1,306,000 1,934,000
Accrued payroll, accrued and withheld payroll taxes 6,319,000 4,437,000 2,800,000
Accrued insurance claims 732,000 775,000 3,002,000
Deferred compensation liability 2,145,000 1,697,000 2,817,000
Income taxes payable     35,000
Prepaid expenses and other assets (220,000) 1,006,000 4,512,000
Net cash provided by operating activities 32,948,000 37,747,000 38,307,000
Cash flows from investing activities:      
Disposals of fixed assets 22,000 44,000 220,000
Additions to property and equipment (5,545,000) (4,174,000) (2,154,000)
Purchases of marketable securities (18,934,000) (38,873,000) (3,686,000)
Sales of marketable securities 29,971,000 46,083,000  
Cash paid for acquisition (1,000,000)   (4,613,000)
Net cash provided by (used in) investing activities 4,514,000 3,080,000 (10,233,000)
Cash flows from financing activities:      
Dividends paid (42,228,000) (39,285,000) (32,246,000)
Repayment of debt assumed in acquisition     (4,718,000)
Reissuance of treasury stock pursuant to Dividend Reinvestment Plan 128,000 121,000 88,000
Tax benefit from equity compensation plans 1,222,000 1,938,000 722,000
Proceeds from the exercise of stock options 2,363,000 4,790,000 1,880,000
Net cash used in financing activities (38,515,000) (32,436,000) (34,274,000)
Net increase (decrease) in cash and cash equivalents (1,053,000) 8,391,000 (6,200,000)
Cash and cash equivalents at beginning of the period 39,692,000 31,301,000 37,501,000
Cash and cash equivalents at end of the period 38,639,000 39,692,000 31,301,000
Supplementary Cash Flow Information:      
Issuance of 27,000 and 99,000 shares of Common Stock related to acquisition in 2011 and 2009, respectively     4,494,000
Issuance of 76,000, 73,000 and 73,000 shares of Common Stock in 2011, 2010 and 2009, respectively, pursuant to Employee Stock Plans $ 1,233,000 $ 1,047,000 $ 777,000