Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues
Rental	$ 88,138	$ 90,857	$ 263,273	$ 261,658
Rental related services	25,040	30,816	70,026	76,738
Rental operations	113,178	121,673	333,299	338,396
Revenues			90,275	84,613
Total revenues	156,448	173,562	423,574	423,009
Direct costs of rental operations:
Depreciation of rental equipment	21,419	20,535	64,640	59,222
Rental related services	18,603	23,007	51,760	57,507
Other	18,553	19,654	56,171	61,128
Total direct costs of rental operations	58,575	63,196	172,571	177,857
Costs of sales	29,669	32,084	57,911	49,984
Total costs of revenues	88,244	95,280	230,482	227,841
Gross profit	68,204	78,282	193,093	195,168
Selling and administrative expenses	30,871	31,534	93,365	92,044
Income from operations	37,333	46,748	99,728	103,124
Other income (expense):
Interest expense	(1,968)	(3,161)	(6,804)	(9,407)
Foreign currency exchange gain (loss)	130	(132)	(189)	(46)
Income before provision for income taxes	35,495	43,455	92,735	93,671
Provision for income taxes	7,394	10,987	21,926	23,266
Net income	$ 28,101	$ 32,468	$ 70,809	$ 70,405
Earnings per share:
Basic	$ 1.17	$ 1.34	$ 2.93	$ 2.90
Diluted	$ 1.15	$ 1.32	$ 2.88	$ 2.86
Shares used in per share calculation:
Basic	24,097	24,268	24,170	24,237
Diluted	24,443	24,632	24,558	24,592
Cash dividends declared per share	$ 0.420	$ 0.375	$ 1.260	$ 1.125
Sales [Member]
Revenues
Revenues	$ 42,331	$ 50,855	$ 87,366	$ 81,387
Other [Member]
Revenues
Revenues	$ 939	$ 1,034	$ 2,909	$ 3,226