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Consolidated Statements Of Cash Flows (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net income $ 8,578,000 $ 7,767,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 1,248,000 1,004,000
Bad debt provision 750,000 1,160,000
Deferred income tax benefits (1,001,000) (419,000)
Share-based compensation expense 560,000 560,000
Amortization of premium on marketable securities 198,000 232,000
Unrealized gain on marketable securities 56,000 145,000
Unrealized (gain) on deferred compensation fund investments (1,297,000) (429,000)
Changes in operating assets and liabilities:    
Accounts and notes receivable (831,000) (3,975,000)
Prepaid income taxes 405,000 4,659,000
Inventories and supplies (822,000) (230,000)
Deferred compensation funding (464,000) (439,000)
Accounts payable and other accrued expenses 11,338,000 319,000
Accrued payroll, accrued and withheld payroll taxes (12,516,000) (6,391,000)
Accrued insurance claims 1,601,000 1,860,000
Deferred compensation liability 1,952,000 1,016,000
Income taxes payable 2,655,000  
Prepaid expenses and other assets (2,969,000) (897,000)
Net cash provided by operating activities 9,441,000 5,942,000
Cash flows from investing activities:    
Disposals of fixed assets   15,000
Additions to property and equipment (813,000) (1,488,000)
Purchases of marketable securities, net (1,223,000) (4,708,000)
Sales of marketable securities, net 10,895,000 6,658,000
Net cash provided by investing activities 8,859,000 477,000
Cash flows from financing activities:    
Dividends paid (10,847,000) (10,402,000)
Reissuance of treasury stock pursuant to Dividend Reinvestment Plan 30,000 35,000
Tax benefits transactions in equity compensation plans 294,000 27,000
Proceeds from the exercise of stock options 1,840,000 921,000
Net cash used in financing activities (8,683,000) (9,419,000)
Net increase/(decrease) in cash and cash equivalents 9,617,000 (3,000,000)
Cash and cash equivalents at beginning of the period 38,639,000 39,692,000
Cash and cash equivalents at end of the period 48,256,000 36,692,000
Supplementary Cash Flow Information:    
Income taxes cash payments, net of refunds 2,852,000 311,000
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