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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net earnings $ 230,057 $ 212,500
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation of property and equipment 30,969 25,712
Gain on sale of property and equipment (456) (108)
Bad debt expense 4,336 4,791
Deferred income taxes (220) 4,154
Stock based compensation 2,700 2,100
Excess tax benefits from stock based compensation (2,093) (8,103)
Amortization of non-compete agreements 158 297
Changes in operating assets and liabilities:    
Trade accounts receivable (68,629) (66,190)
Inventories (9,724) (16,537)
Other current assets (8,515) 1,242
Accounts payable 11,734 7,464
Accrued expenses 13,135 7,317
Income taxes 16,558 16,023
Other (6,145) (231)
Net cash provided by operating activities 213,865 190,431
Cash flows from investing activities:    
Purchase of property and equipment (92,561) (50,980)
Proceeds from sale of property and equipment 2,904 1,325
Net increase in marketable securities (83) (1)
Decrease (increase) in other assets 37 (87)
Net cash used in investing activities (89,703) (49,743)
Cash flows from financing activities:    
Borrowings under line of credit 30,000 0
Payments against line of credit (30,000) 0
Proceeds from exercise of stock options 7,118 20,201
Excess tax benefits from stock based compensation 2,093 8,103
Payment of dividends (89,000) (100,529)
Net cash used in financing activities (79,789) (72,225)
Effect of exchange rate changes on cash (1,131) (223)
Net increase in cash and cash equivalents 43,242 68,240
Cash and cash equivalents at beginning of period 79,611 117,676
Cash and cash equivalents at end of period 122,853 185,916
Supplemental disclosure of cash flow information:    
Cash paid during each period for interest 37 0
Cash paid during each period for income taxes $ 120,716 $ 113,810