Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Rental	$ 88,105	$ 77,267	$ 170,801	$ 151,528
Rental related services	24,467	19,086	45,922	36,917
Rental operations	112,572	96,353	216,723	188,445
Revenues			32,724	33,623
Total revenues	127,439	116,983	249,447	222,068
Direct costs of rental operations:
Depreciation of rental equipment	19,726	18,103	38,687	35,880
Rental related services	18,137	15,018	34,500	28,786
Other	21,741	18,753	41,474	35,022
Total direct costs of rental operations	59,604	51,874	114,661	99,688
Costs of sales	7,954	11,181	17,900	18,282
Total costs of revenues	67,558	63,055	132,561	117,970
Gross profit	59,881	53,928	116,886	104,098
Selling and administrative expenses	30,815	29,479	60,510	57,607
Income from operations	29,066	24,449	56,376	46,491
Other income (expense):
Interest expense	(3,138)	(2,999)	(6,246)	(5,991)
Foreign currency exchange gain (loss)	37	(344)	86	(376)
Income before provision for income taxes	25,965	21,106	50,216	40,124
Provision for income taxes	6,477	5,194	12,279	9,746
Net income	$ 19,488	$ 15,912	$ 37,937	$ 30,378
Earnings per share:
Basic	$ 0.80	$ 0.66	$ 1.57	$ 1.26
Diluted	$ 0.79	$ 0.65	$ 1.54	$ 1.24
Shares used in per share calculation:
Basic	24,246	24,145	24,221	24,106
Diluted	24,579	24,584	24,561	24,549
Cash dividends declared per share	$ 0.375	$ 0.340	$ 0.750	$ 0.680
Sales [Member]
Revenues
Revenues	$ 13,707	$ 19,546	$ 30,532	$ 31,637
Other [Member]
Revenues
Revenues	$ 1,160	$ 1,084	$ 2,192	$ 1,986