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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 305,219 $ 338,920
Marketable securities 404,781 431,516
Accounts receivable, less allowance for doubtful accounts of $4,180 and $4,118 at March 31, 2013 and December 31, 2012, respectively 166,614 153,423
Inventories:    
Parts 85,502 89,598
Assemblies in process 29,208 32,303
Finished goods 34,348 17,509
Inventory, Net, Total 149,058 139,410
Deferred tax assets 83,869 77,305
Prepayments and other current assets 97,909 95,487
Total current assets 1,207,450 1,236,061
Net property, plant and equipment 264,043 265,782
Marketable securities 246,253 235,872
Other assets 18,583 20,209
Retirement plans assets 3,106 3,282
Intangible assets, net 300,831 318,867
Goodwill 349,272 349,272
Total assets 2,389,538 2,429,345
Current liabilities:    
Accounts payable 59,100 58,324
Accrued employees' compensation and withholdings 54,555 86,264
Deferred revenue and customer advances 71,816 81,357
Other accrued liabilities 51,918 57,249
Accrued income taxes 3,221 12,306
Current debt 176,835 2,328
Total current liabilities 417,445 297,828
Long-term deferred revenue and customer advances 15,622 16,227
Retirement plans liabilities 94,592 94,373
Deferred tax liabilities 50,201 50,201
Long-term other accrued liabilities 20,413 21,302
Long-term debt   171,059
Total liabilities 598,273 650,990
Commitments and contingencies (Note N)      
SHAREHOLDERS' EQUITY    
Common stock, $0.125 par value, 1,000,000 shares authorized, 190,422 shares and 187,908 shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively 23,803 23,488
Additional paid-in capital 1,353,789 1,347,762
Accumulated other comprehensive income 5,799 5,820
Retained earnings 407,874 401,285
Total shareholders' equity 1,791,265 1,778,355
Total liabilities and shareholders' equity $ 2,389,538 $ 2,429,345