Income Statement (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenue:
Rental	$ 279,135	$ 288,970	$ 837,149	$ 852,045
Sales	252,236	217,738	715,236	638,240
Total revenue	531,371	506,708	1,552,385	1,490,285
Rental expenses	136,789	155,765	433,634	464,606
Cost of sales	62,925	61,551	185,062	184,782
Gross profit	331,657	289,392	933,689	840,897
Selling, general and administrative expenses	155,855	139,512	452,377	422,103
Research and development expenses	23,530	20,873	68,124	67,375
Acquired intangible asset amortization	8,855	8,855	26,567	28,570
Operating earnings	143,417	120,152	386,621	322,849
Interest income and other	297	265	766	544
Interest expense	(17,314)	(21,534)	(55,311)	(67,360)
Foreign currency gain (loss)	(2,117)	2,148	(2,142)	(3,119)
Earnings before income taxes	124,283	101,031	329,934	252,914
Income taxes	33,557	25,258	89,365	70,823
Net earnings	$ 90,726	$ 75,773	$ 240,569	$ 182,091
Net earnings per share:
Basic	$ 1.25	$ 1.07	$ 3.34	$ 2.57
Diluted	$ 1.16	$ 1.06	$ 3.21	$ 2.54
Weighted average shares outstanding:
Basic	72,546	70,994	72,017	70,784
Diluted	78,411	71,695	74,889	71,647