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Consolidated Statements Of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Cash flows from operating activities:    
Net income $ 17,595,000 $ 16,149,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,049,000 1,840,000
Bad debt provision 1,500,000 1,050,000
Deferred income tax benefits (1,494,000) (1,474,000)
Stock-based compensation expense 1,093,000 609,000
Amortization of premium on marketable securities 479,000 426,000
Unrealized (gain) loss on marketable securities 252,000 658,000
Unrealized (gain) loss on deferred compensation fund investments (548,000) 370,000
Changes in operating assets and liabilities:    
Accounts and notes receivable (10,279,000) (3,947,000)
Inventories and supplies (803,000) (1,372,000)
Prepaid income taxes 4,165,000  
Prepaid expenses and other assets (518,000) 1,772,000
Notes receivable - long term portion 1,262,000 (1,542,000)
Deferred compensation funding (834,000) (825,000)
Accounts payable and other accrued expenses (2,160,000) (1,342,000)
Accrued payroll, accrued and withheld payroll taxes (561,000) (801,000)
Income taxes payable   409,000
Accrued insurance claims 2,671,000 1,536,000
Deferred compensation liability 1,649,000 696,000
Net cash provided by operating activities 15,518,000 14,212,000
Cash flows from investing activities:    
Proceeds from disposals of fixed assets 18,000 44,000
Additions to property and equipment (2,653,000) (1,459,000)
Purchases of marketable securities, net (8,603,000) (26,089,000)
Sales of marketable securities, net 10,902,000 33,584,000
Net cash provided by (used in) investing activities (336,000) 6,080,000
Cash flows from financing activities:    
Dividends paid (20,902,000) (18,901,000)
Reissuance of treasury stock pursuant to Dividend Reinvestment Plan 66,000 56,000
Tax benefit from equity compensation plans 119,000 827,000
Proceeds from the exercise of stock options 1,341,000 1,393,000
Net cash used in financing activities (19,376,000) (16,625,000)
Net increase (decrease) in cash and cash equivalents (4,194,000) 3,667,000
Cash and cash equivalents at beginning of the period 39,692,000 31,301,000
Cash and cash equivalents at end of the period 35,498,000 34,968,000
Supplementary Cash Flow Information:    
Income taxes cash payments, net of refunds 6,683,000 10,347,000
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