Condensed Consolidated Results of Operations (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues:
Service, rental and maintenance, net of service credits	$ 46,006	$ 53,905	$ 145,484	$ 169,711
Product and related sales, net	15,464	2,805	38,492	8,895
Total revenues	61,470	56,710	183,976	178,606
Operating expenses:
Cost of products sold	5,951	819	15,459	3,162
Service, rental and maintenance	15,217	16,821	47,869	52,937
Selling and marketing	5,927	4,060	17,439	13,011
General and administrative	13,077	12,907	42,485	44,643
Severance and restructuring	28	86	78	441
Depreciation, amortization and accretion	5,080	5,899	14,918	19,901
Total operating expenses	45,280	40,592	138,248	134,095
Operating income	16,190	16,118	45,728	44,511
Interest (expense) income, net	(732)	6	(1,850)	13
Other (expense) income, net	(1)	2,320	7,820	2,578
Income before income tax expense (benefit)	15,457	18,444	51,698	47,102
Income tax expense (benefit)	5,010	3,060	(17,995)	9,744
Net income	$ 10,447	$ 15,384	$ 69,693	$ 37,358
Basic net income per common share	$ 0.47	$ 0.70	$ 3.16	$ 1.67
Diluted net income per common share	$ 0.46	$ 0.69	$ 3.10	$ 1.65
Basic weighted average common shares outstanding	22,090,913	22,060,636	22,080,485	22,338,566
Diluted weighted average common shares outstanding	22,573,064	22,372,786	22,487,374	22,651,501
Cash dividends declared per common share	$ 0.25	$ 0.25	$ 0.75	$ 0.75