Condensed Consolidated Results of Operations (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues:
Service, rental and maintenance, net of service credits	$ 49,286	$ 56,380	$ 99,478	$ 115,806
Product sales, net of credits	15,885	2,732	23,027	6,090
Total revenues	65,171	59,112	122,505	121,896
Operating expenses:
Cost of products sold	7,077	1,134	9,502	2,343
Service, rental and maintenance	16,187	17,175	32,649	36,116
Selling and marketing	6,589	4,394	11,510	8,951
General and administrative	13,866	15,924	29,494	31,736
Severance and restructuring	17	41	50	355
Depreciation, amortization and accretion	5,298	6,698	9,838	14,002
Total operating expenses	49,034	45,366	93,043	93,503
Operating income	16,137	13,746	29,462	28,393
Interest (expense) income, net	(862)	4	(1,118)	7
Other income, net	7,692	180	7,897	258
Income before income tax expense (benefit)	22,967	13,930	36,241	28,658
Income tax expense (benefit)	4,372	841	(23,005)	6,684
Net income	$ 18,595	$ 13,089	$ 59,246	$ 21,974
Basic net income per common share	$ 0.84	$ 0.59	$ 2.68	$ 0.98
Diluted net income per common share	$ 0.82	$ 0.58	$ 2.64	$ 0.96
Basic weighted average common shares outstanding	22,086,848	22,307,488	22,075,185	22,479,834
Diluted weighted average common shares outstanding	22,551,862	22,620,707	22,443,417	22,793,827
Cash dividends declared per common share	$ 0.25	$ 0.25	$ 0.50	$ 0.50