Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 369,429	$ 383,990
Short-term investments	1,022,708	897,361
Accounts receivable, less allowances for doubtful accounts and sales returns of $6,343 and $8,584 at June 30, 2012 and December 31, 2011, respectively	355,144	367,085
Inventories	236,763	212,864
Other current assets	81,248	80,804
Total current assets	2,065,292	1,942,104
Property, plant and equipment, net	251,357	237,095
Intangible assets, net	199,013	191,992
Goodwill	306,770	297,071
Other assets	61,124	54,972
Total assets	2,883,556	2,723,234
Current liabilities:
Notes payable and debt	401,354	290,832
Accounts payable	62,792	55,317
Accrued employee compensation	26,462	49,949
Deferred revenue and customer advances	133,388	109,922
Accrued income taxes	13,658	9,449
Accrued warranty	12,253	13,258
Other current liabilities	71,750	73,136
Total current liabilities	721,657	601,863
Long-term liabilities:
Long-term debt	700,000	700,000
Long-term portion of retirement benefits	97,059	92,970
Long-term income tax liability	71,014	72,613
Other long-term liabilities	31,143	29,210
Total long-term liabilities	899,216	894,793
Total liabilities	1,620,873	1,496,656
Commitments and contingencies (Notes 5, 6 and 9)
Stockholders' equity:
Preferred stock, par value $0.01 per share, 5,000 shares authorized, none issued at June 30, 2012 and December 31, 2011	0	0
Common stock, par value $0.01 per share, 400,000 shares authorized, 153,449 and 152,757 shares issued, 87,663 and 88,996 shares outstanding at June 30, 2012 and December 31, 2011, respectively	1,534	1,528
Additional paid-in capital	1,128,521	1,089,959
Retained earnings	3,237,837	3,051,447
Treasury stock, at cost, 65,786 and 63,761 shares at June 30, 2012 and December 31, 2011, respectively	(3,051,620)	(2,880,301)
Accumulated other comprehensive loss	(53,589)	(36,055)
Total stockholders' equity	1,262,683	1,226,578
Total liabilities and stockholders' equity	$ 2,883,556	$ 2,723,234