Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Activities:
Net earnings	$ 350,011	$ 332,969	$ 386,243
Adjustments to reconcile net earnings to net cash from operating activities:
Provision for losses (recoveries) on accounts receivable	2,116	(90)	1,327
Deferred income tax (benefit) expense	(20,975)	11,639	(4,065)
Excess tax benefits from stock plans	(2,339)	(5,401)	(5,300)
Stock compensation expense	43,813	44,058	44,278
Depreciation and amortization	48,071	39,940	36,776
Other	844	4,864	2,496
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(64,575)	(89,856)	46,915
Increase (decrease) in accounts payable and accrued expenses	44,150	30,625	(40,819)
Increase (decrease) in income taxes payable, net	8,435	1,441	(3,237)
Increase in other current assets	(2,015)	(63)	(7,483)
Net cash from operating activities	407,536	370,126	457,131
Investing Activities:
Purchase of short-term investments	(116,116)	(15,879)	0
Proceeds from maturities of short-term investments	89,915	16,221	29
Purchase of property and equipment	(53,411)	(47,626)	(78,115)
Other	2,806	290	(2,253)
Net cash from investing activities	(76,806)	(46,994)	(80,339)
Financing Activities:
Proceeds from issuance of common stock	59,752	52,511	56,646
Repurchases of common stock	(261,936)	(302,414)	(112,071)
Excess tax benefits from stock plans	2,339	5,401	5,300
Dividends paid	(123,292)	(117,263)	(106,011)
Purchase of noncontrolling interest	(7,730)	0	0
Distributions to noncontrolling interest	(1,161)	(1,282)	(955)
Net cash from financing activities	(332,028)	(363,047)	(157,091)
Effect of exchange rate changes on cash and cash equivalents	(11,892)	6,401	(9,810)
(Decrease) increase in cash and cash equivalents	(13,190)	(33,514)	209,891
Cash and cash equivalents at beginning of year	1,260,842	1,294,356	1,084,465
Cash and cash equivalents at end of year	1,247,652	1,260,842	1,294,356
Taxes Paid:
Income taxes	$ 235,368	$ 207,174	$ 266,621