Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues
Rental	$ 94,581	$ 85,629	$ 180,668	$ 175,135
Rental related services	22,688	20,475	42,357	44,986
Rental operations	117,269	106,104	223,025	220,121
Revenues			44,605	47,005
Total revenues	146,435	137,673	267,630	267,126
Direct costs of rental operations:
Depreciation of rental equipment	23,159	21,583	44,414	43,221
Rental related services	17,276	14,894	31,880	33,157
Other	23,278	18,165	42,985	37,618
Total direct costs of rental operations	63,713	54,642	119,279	113,996
Costs of sales	16,855	19,799	25,403	28,242
Total costs of revenues	80,568	74,441	144,682	142,238
Gross profit	65,867	63,232	122,948	124,888
Selling and administrative expenses	36,261	30,540	69,398	62,494
Income from operations	29,606	32,692	53,550	62,394
Other expense:
Interest expense	(2,257)	(2,184)	(4,040)	(4,836)
Foreign currency exchange loss (gain)	(2)	117	(57)	(319)
Income before provision for income taxes	27,347	30,625	49,453	57,239
Provision for income taxes	6,739	8,076	11,447	14,531
Net income	$ 20,608	$ 22,549	$ 38,006	$ 42,708
Earnings per share:
Basic	$ 0.85	$ 0.93	$ 1.57	$ 1.76
Diluted	$ 0.84	$ 0.92	$ 1.55	$ 1.74
Shares used in per share calculation:
Basic	24,229	24,121	24,191	24,207
Diluted	24,494	24,471	24,505	24,612
Cash dividends declared per share	$ 0.435	$ 0.420	$ 0.870	$ 0.840
Sales [Member]
Revenues
Revenues	$ 28,256	$ 30,669	$ 42,867	$ 45,035
Other [Member]
Revenues
Revenues	$ 910	$ 900	$ 1,738	$ 1,970