Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Rental	$ 73,781	$ 67,757	$ 211,712	$ 201,036
Rental related services	21,856	20,122	58,587	57,028
Rental operations	95,637	87,879	270,299	258,064
Sales	38,684	33,486	67,166	58,916
Other	1,067	628	2,342	1,817
Total revenues	135,388	121,993	339,807	318,797
Direct costs of rental operations:
Depreciation of rental equipment	17,492	17,819	52,113	54,590
Rental related services	16,611	16,026	44,756	44,428
Other	15,396	14,689	46,794	45,991
Total direct costs of rental operations	49,499	48,534	143,663	145,009
Costs of sales	27,114	23,026	44,488	38,944
Total costs of revenues	76,613	71,560	188,151	183,953
Gross profit	58,775	50,433	151,656	134,844
Selling and administrative expenses	28,489	26,201	83,702	78,281
Income from operations	30,286	24,232	67,954	56,563
Other income (expense):
Interest expense	(2,986)	(2,940)	(8,724)	(9,486)
Foreign currency exchange gain (loss)	36	(15)	273	59
Income before provision for income taxes	27,336	21,277	59,503	47,136
Provision for income taxes	10,574	8,405	23,307	18,619
Net income	$ 16,762	$ 12,872	$ 36,196	$ 28,517
Earnings per share:
Basic	$ 0.70	$ 0.54	$ 1.51	$ 1.19
Diluted	$ 0.69	$ 0.54	$ 1.50	$ 1.19
Shares used in per share calculation:
Basic	24,015	23,911	23,984	23,891
Diluted	24,228	24,041	24,201	23,957
Cash dividends declared per share	$ 0.260	$ 0.255	$ 0.780	$ 0.765