CONSOLIDATED STATEMENTS 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
Operating revenue:
Equipment	$ 14,269	$ 9,954	$ 31,499	$ 27,906
Services	30,975	33,526	92,475	92,562
Total operating revenue	45,244	43,480	123,974	120,468
Costs and expenses:
Cost of sales, excluding depreciation and amortization	12,223	8,519	27,146	23,968
Cost of services, excluding depreciation and amortization	14,738	16,458	44,244	45,402
Selling, general and administrative expenses	6,147	6,669	19,419	18,425
Depreciation	5,706	5,356	16,890	15,900
Amortization of intangibles	88	90	265	268
Total costs and expenses	38,902	37,092	107,964	103,963
Operating income	6,342	6,388	16,010	16,505
Other income and expense:
Interest and other income	26	11	50	62
Interest expense	(1,487)	(1,128)	(3,570)	(3,820)
Total other (expense)	(1,461)	(1,117)	(3,520)	(3,758)
Income before income taxes	4,881	5,271	12,490	12,747
Income tax provision	1,910	228	4,683	2,767
Net income	$ 2,971	$ 5,043	$ 7,807	$ 9,980
Basic earnings per share (in dollars per share)	$ 0.22	$ 0.38	$ 0.58	$ 0.76
Weighted average common shares outstanding (in shares)	13,394,225	13,263,600	13,363,874	13,215,046
Diluted earnings per share (in dollars per share)	$ 0.22	$ 0.38	$ 0.58	$ 0.76
Weighted average common and equivalent shares outstanding (in shares)	13,409,414	13,264,996	13,376,261	13,217,325
Dividends per share (in dollars per share)	$ 0.135	$ 0.13	$ 0.405	$ 0.39