CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating revenue:
Equipment	$ 15,299	$ 8,195
Services	31,645	30,427
Total operating revenue	46,944	38,622
Costs and expenses:
Cost of sales, excluding depreciation and amortization	13,466	6,999
Cost of services, excluding depreciation and amortization	15,326	14,735
Selling, general and administrative expenses	6,706	6,543
Depreciation	6,056	5,591
Amortization of intangibles	138	88
Total costs and expenses	41,692	33,956
Operating income	5,252	4,666
Other income and expense:
Interest and other income	20	10
Interest expense	(1,411)	(729)
Total other (expense)	(1,391)	(719)
Income before income taxes	3,861	3,947
Income tax provision	1,567	1,601
Net income	$ 2,294	$ 2,346
Basic earnings per share (in dollars per share)	$ 0.17	$ 0.18
Weighted average common shares outstanding (in shares)	13,450,850	13,329,603
Diluted earnings per share (in dollars per share)	$ 0.17	$ 0.18
Weighted average common and equivalent shares outstanding (in shares)	13,468,749	13,341,871
Dividends per share (in dollars per share)	$ 0.14	$ 0.135