CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
CASH PROVIDED BY OPERATING ACTIVITIES:
Net earnings	$ 171,482	$ 127,509
Income items not affecting cash:
Depreciation and amortization	36,465	44,278
Deferred income taxes	(17,238)	971
Stock-based compensation arrangements	19,449	24,006
Gain on sale of certain optics assets	0	(4,129)
Other non-cash items	4,346	3,241
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable, net	43,295	(17,422)
Increase in inventories	(72,531)	(7,196)
Decrease in prepaid expenses and other current assets	1,784	10,248
Increase in other assets	(1,775)	(26,609)
Increase in accounts payable	29,011	6,362
Decrease in deferred revenue	(106)	(2,194)
(Decrease) increase in accrued payroll and other current liabilities	(21,055)	5,795
Decrease in accrued income taxes	(957)	(2,571)
Increase in other long-term liabilities	5,309	1,111
Cash provided by operating activities	197,479	163,400
CASH USED BY INVESTING ACTIVITIES:
Additions to property and equipment, net	(50,116)	(40,928)
Proceeds from sale of certain optics assets	0	(12,000)
Cash used by investing activities	(50,116)	(28,928)
CASH USED BY FINANCING ACTIVITIES:
Repayments of long term debt, net	(11,250)	(11,250)
Repurchase of common stock	(93,381)	(76,624)
Dividends paid	(46,193)	(42,410)
Proceeds from shares issued pursuant to stock-based compensation plans	21,188	34,168
Excess tax benefit of stock options exercised	4,216	7,705
Other financing activities	(10)	(36)
Cash used by financing activities	(125,430)	(88,447)
Effect of exchange rate changes on cash	(27,931)	(23,128)
Net increase in cash and cash equivalents	(5,998)	22,897
Cash and cash equivalents, beginning of period	531,374	542,476
Cash and cash equivalents, end of period	$ 525,376	$ 565,373