CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
CASH PROVIDED BY OPERATING ACTIVITIES:
Net earnings	$ 127,509	$ 148,280
Income items not affecting cash:
Depreciation and amortization	44,278	44,978
Deferred income taxes	971	(38)
Stock-based compensation arrangements	24,006	20,673
Gain on sale of certain optics assets	(4,129)	0
Other non-cash items	3,241	1,485
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	(17,422)	52,856
(Increase) decrease in inventories	(7,196)	6,481
Decrease (increase) in prepaid expenses and other current assets	10,248	(2,142)
Increase in other assets	(26,609)	(4,911)
Increase (decrease) in accounts payable	6,362	(374)
(Decrease) increase in deferred revenue	(2,194)	808
Increase (decrease) in accrued payroll and other current liabilities	5,795	(9,865)
Decrease in accrued income taxes	(2,571)	(12,347)
Increase in other long-term liabilities	1,111	3,907
Cash provided by operating activities	163,400	249,791
CASH USED BY INVESTING ACTIVITIES:
Additions to property and equipment, net	(40,928)	(36,997)
Business acquisitions, net of cash acquired	0	20,073
Proceeds from sale of certain optics assets	(12,000)	0
Cash used by investing activities	(28,928)	(57,070)
CASH USED BY FINANCING ACTIVITIES:
Proceeds from long-term debt, including current portion	0	150,000
Repayments of long term debt, net	(11,250)	(7,500)
Repurchase of common stock	(76,624)	(133,049)
Dividends paid	(42,410)	(38,695)
Proceeds from shares issued pursuant to stock-based compensation plans	34,168	5,953
Excess tax benefit of stock options exercised	7,705	928
Other financing activities	(36)	(1,273)
Cash used by financing activities	(88,447)	(23,636)
Effect of exchange rate changes on cash	(23,128)	1,375
Net increase in cash and cash equivalents	22,897	170,460
Cash and cash equivalents, beginning of period	542,476	321,739
Cash and cash equivalents, end of period	$ 565,373	$ 492,199