Income Statement (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenue:
Rental	$ 279,314	$ 283,084	$ 558,014	$ 563,075
Sales	240,516	214,688	463,000	420,502
Total revenue	519,830	497,772	1,021,014	983,577
Rental expenses	146,353	155,622	296,845	308,841
Cost of sales	60,418	62,307	122,137	123,231
Gross profit	313,059	279,843	602,032	551,505
Selling, general and administrative expenses	152,155	147,212	296,522	282,591
Research and development expenses	23,411	21,718	44,594	46,502
Acquired intangible asset amortization	8,856	9,556	17,712	19,715
Operating earnings	128,637	101,357	243,204	202,697
Interest income and other	267	143	469	279
Interest expense	(17,157)	(22,264)	(37,997)	(45,826)
Foreign currency loss	(206)	(2,657)	(25)	(5,267)
Earnings before income taxes	111,541	76,579	205,651	151,883
Income taxes	30,116	22,974	55,808	45,565
Net earnings	$ 81,425	$ 53,605	$ 149,843	$ 106,318
Net earnings per share:
Basic	$ 1.13	$ 0.76	$ 2.09	$ 1.50
Diluted	$ 1.09	$ 0.75	$ 2.04	$ 1.48
Weighted average shares outstanding:
Basic	72,128	70,836	71,748	70,678
Diluted	74,882	71,805	73,420	71,657