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Consolidated Statements of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net income $ 19,899,000 $ 17,595,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 2,528,000 2,049,000
Bad debt provision 1,350,000 1,500,000
Deferred income tax benefits (2,405,000) (1,494,000)
Share-based compensation expense 1,144,000 1,093,000
Amortization of premium on marketable securities 346,000 479,000
Unrealized gain on marketable securities 82,000 252,000
Unrealized (gain) on deferred compensation fund investments (937,000) (548,000)
Changes in operating assets and liabilities:    
Accounts and notes receivable (7,891,000) (9,017,000)
Prepaid income taxes 3,740,000 4,165,000
Inventories and supplies (1,906,000) (803,000)
Deferred compensation funding (1,078,000) (834,000)
Accounts payable and other accrued expenses 10,759,000 (2,160,000)
Accrued payroll, accrued and withheld payroll taxes 536,000 (561,000)
Accrued insurance claims 3,485,000 2,671,000
Deferred compensation liability 2,360,000 1,649,000
Income taxes payable      
Prepaid expenses and other assets (4,630,000) (518,000)
Net cash provided by operating activities 27,382,000 15,518,000
Cash flows from investing activities:    
Disposals of fixed assets 10,000 18,000
Additions to property and equipment (1,825,000) (2,653,000)
Purchases of marketable securities, net (6,362,000) (8,603,000)
Sales of marketable securities, net 15,784,000 10,902,000
Net cash provided (used) by investing activities 7,607,000 (336,000)
Cash flows from financing activities:    
Dividends paid (21,803,000) (20,902,000)
Reissuance of treasury stock pursuant to Dividend Reinvestment Plan 59,000 66,000
Tax benefits arising from stock option transactions 1,051,000 119,000
Proceeds from the exercise of stock options 2,664,000 1,341,000
Net cash used in financing activities (18,029,000) (19,376,000)
Net increase/(decrease) in cash and cash equivalents 16,960,000 (4,194,000)
Cash and cash equivalents at beginning of the period 38,639,000 39,692,000
Cash and cash equivalents at end of the period 55,599,000 35,498,000
Supplementary Cash Flow Information:    
Income taxes cash payments, net of refunds 9,782,000 6,683,000
Issuance of 70,000 and 76,000 shares in 2012 and 2011, respectively, of Common Stock pursuant to Employee Stock Plans $ 1,250,000 $ 1,233,000