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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net earnings $ 111,931 $ 109,048
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation of property and equipment 17,281 15,152
Gain on sale of property and equipment (216) (213)
Bad debt expense 2,796 2,045
Deferred income taxes 356 379
Stock-based compensation 1,380 1,350
Excess tax benefits from stock-based compensation (550) (954)
Amortization of non-compete agreements 132 26
Changes in operating assets and liabilities:    
Trade accounts receivable (61,646) (48,619)
Inventories (9,919) 14,899
Other current assets 7,031 13,478
Accounts payable 6,444 (2,692)
Accrued expenses (10) (64)
Income taxes 72,679 60,001
Other (4,391) (3,592)
Net cash provided by operating activities 143,298 160,244
Cash flows from investing activities:    
Purchases of property and equipment (32,564) (55,513)
Proceeds from sale of property and equipment 1,054 1,267
Increase in marketable securities (2) (63)
Net decrease (increase) in other assets 22 (3)
Net cash used in investing activities (31,490) (54,312)
Cash flows from financing activities:    
Borrowings under line of credit 140,000 20,000
Payments against line of credit (140,000) (20,000)
Proceeds from exercise of stock options 1,641 2,821
Excess tax benefits from stock-based compensation 550 954
Purchases of common stock (8,847) 0
Payment of dividends (74,193) (29,662)
Net cash used in financing activities (80,849) (25,887)
Effect of exchange rate changes on cash (444) (416)
Net increase in cash and cash equivalents 30,515 79,629
Cash and cash equivalents at beginning of period 58,506 79,611
Cash and cash equivalents at end of period 89,021 159,240
Supplemental disclosure of cash flow information:    
Cash paid during each period for interest 70 34
Net cash (received) paid during each period for income taxes $ (6,216) $ 6,502