CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		12 Months Ended
	Jan. 31, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Revenues:
Rental		$ 132,338	$ 114,742
Sales		8,103	7,978
Other		213	807
Total revenues		140,654	123,527
Costs and expenses:
Rental, selling and general expenses		88,998	78,359
Cost of sales		5,391	5,112
Restructuring expenses		111	899	$ 2,886
Depreciation and amortization		16,823	15,264
Total costs and expenses		111,323	99,634
Income from operations		29,331	23,893
Other income (expense):
Interest income		6
Interest expense		(9,599)	(8,402)
Foreign currency exchange		66	(9)
Income before income tax provision		19,804	15,482
Income tax provision		4,949	5,330
Net income		$ 14,855	$ 10,152
Earnings per share:
Basic		$ 0.34	$ 0.23
Diluted		$ 0.33	$ 0.23
Weighted average number of common and common share equivalents outstanding:
Basic		44,214	44,109
Diluted		44,842	44,341
Cash dividends declared per share	$ 0.250	$ 0.25	$ 0.23