Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Activities:
Net earnings	$ 332,969	$ 386,243	$ 344,205
Adjustments to reconcile net earnings to net cash provided by operating activities:
(Recoveries) provision for losses on accounts receivable	(90)	1,327	3,414
Deferred income tax expense (benefit)	11,639	(4,065)	10,569
Excess tax benefits from stock plans	(5,401)	(5,300)	(23,863)
Stock compensation expense	44,058	44,278	43,743
Depreciation and amortization	39,940	36,776	36,900
Other	4,864	2,496	1,215
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(89,856)	46,915	(188,823)
Increase (decrease) in accounts payable and accrued expenses	30,625	(40,819)	130,138
Increase (decrease) in income taxes payable, net	1,441	(3,237)	39,495
(Increase) decrease in other current assets	(63)	(7,483)	(1,475)
Net cash from operating activities	370,126	457,131	395,518
Investing Activities:
Purchase of property and equipment	(47,626)	(78,115)	(42,408)
Prepayment on long-term leases, net	0	(936)	0
Other	632	(1,288)	229
Net cash from investing activities	(46,994)	(80,339)	(42,179)
Financing Activities:
Proceeds from issuance of common stock	52,511	56,646	99,784
Repurchases of common stock	(302,414)	(112,071)	(246,312)
Excess tax benefits from stock plans	5,401	5,300	23,863
Dividends paid	(117,263)	(106,011)	(84,872)
Distributions to noncontrolling interest	(1,282)	(955)	(1,051)
Net cash from financing activities	(363,047)	(157,091)	(208,588)
Effect of exchange rate changes on cash and cash equivalents	6,401	(9,810)	13,785
(Decrease) increase in cash and cash equivalents	(33,514)	209,891	158,536
Cash and cash equivalents at beginning of year	1,294,356	1,084,465	925,929
Cash and cash equivalents at end of year	1,260,842	1,294,356	1,084,465
Interest and Taxes Paid:
Interest	515	296	110
Income taxes	$ 207,174	$ 266,621	$ 171,618