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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net earnings $ 384,673 $ 404,457
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation of property and equipment 74,471 60,500
Gain on sale of property and equipment (312) (659)
Bad debt expense 6,626 6,768
Deferred income taxes 2,658 2,822
Stock-based compensation 2,900 4,641
Excess tax benefits from stock-based compensation (5,537) (1,756)
Amortization of non-compete agreements 395 395
Changes in operating assets and liabilities:    
Trade accounts receivable (80,406) (88,420)
Inventories (51,041) (24,623)
Other current assets 11,557 (1,984)
Accounts payable (8,208) 28,070
Accrued expenses 3,869 20,789
Income taxes 39,773 (8,525)
Other (100) (490)
Net cash provided by operating activities 381,318 401,985
Cash flows from investing activities:    
Purchases of property and equipment (161,975) (119,462)
Proceeds from sale of property and equipment 4,577 6,696
Other (203) (82)
Net cash used in investing activities (157,601) (112,848)
Cash flows from financing activities:    
Borrowings under debt obligations 760,000 965,000
Payments against debt obligations (680,000) (740,000)
Proceeds from exercise of stock options 24,957 9,289
Excess tax benefits from stock-based compensation 5,537 1,756
Purchases of common stock (59,440) (273,490)
Payments of dividends (259,878) (245,983)
Net cash used in financing activities (208,824) (283,428)
Effect of exchange rate changes on cash and cash equivalents 3,071 (8,430)
Net increase (decrease) in cash and cash equivalents 17,964 (2,721)
Cash and cash equivalents at beginning of period 129,019 114,496
Cash and cash equivalents at end of period 146,983 111,775
Supplemental disclosure of cash flow information:    
Cash paid for interest 4,372 2,096
Net cash paid for income taxes $ 181,247 $ 248,473