Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues
Rental	$ 271,388	$ 273,696	$ 269,575
Rental related services	75,859	73,314	64,132
Rental operations	347,247	347,010	333,707
Sales	74,410	55,385	72,248
Other	2,423	2,149	2,167
Total revenues	424,080	404,544	408,122
Direct costs of rental operations
Depreciation of rental equipment	72,197	75,213	72,678
Rental related services	56,374	54,719	48,849
Other	62,800	60,936	56,946
Total direct costs of rental operations	191,371	190,868	178,473
Cost of sales	48,542	36,769	47,430
Total costs of revenues	239,913	227,637	225,903
Gross profit	184,167	176,907	182,219
Selling and administrative expenses	104,908	99,950	96,859
Income from operations	79,259	76,957	85,360
Other income (expense):
Interest expense	(12,207)	(10,092)	(9,280)
Gain on sale of property, plant and equipment			812
Foreign currency exchange loss	(121)	(488)	(331)
Income before provision for income taxes	66,931	66,377	76,561
Provision for income taxes	28,680	25,907	30,852
Net income	$ 38,251	$ 40,470	$ 45,709
Earnings per share:
Basic	$ 1.60	$ 1.60	$ 1.77
Diluted	$ 1.60	$ 1.59	$ 1.75
Shares used in per share calculations:
Basic	23,900	25,369	25,914
Diluted	23,976	25,457	26,175
Cash dividends declared per share	$ 1.02	$ 1.00	$ 0.98