Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Rental	$ 269,575	$ 255,766	$ 248,444
Rental related services	64,132	53,148	46,920
Rental operations	333,707	308,914	295,364
Sales	72,248	68,443	66,444
Other	2,167	2,152	2,231
Total revenues	408,122	379,509	364,039
Direct costs of rental operations
Depreciation of rental equipment	72,678	68,208	63,819
Rental related services	48,849	40,189	37,207
Other	56,946	55,017	45,581
Total direct costs of rental operations	178,473	163,414	146,607
Cost of sales	47,430	47,080	49,173
Total costs of revenues	225,903	210,494	195,780
Gross profit	182,219	169,015	168,259
Selling and administrative expenses	96,859	88,765	86,278
Income from operations	85,360	80,250	81,981
Other income (expense):
Interest expense	(9,280)	(8,687)	(9,149)
Gain on sale of property, plant and equipment	812
Foreign currency exchange gain (loss)	(331)	(189)	35
Income before provision for income taxes	76,561	71,374	72,867
Provision for income taxes	30,852	27,977	28,090
Net income	$ 45,709	$ 43,397	$ 44,777
Earnings per share:
Basic	$ 1.77	$ 1.71	$ 1.80
Diluted	$ 1.75	$ 1.67	$ 1.78
Shares used in per share calculations:
Basic	25,914	25,433	24,759
Diluted	26,175	25,926	25,156
Cash dividends declared per share	$ 0.98	$ 0.96	$ 0.94