Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities:
Net income	$ 89,704	$ 101,984	$ 96,806
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	106,695	94,643	89,476
Provision for doubtful accounts	451	1,343	1,013
Share-based compensation	7,666	5,549	5,892
Gain on sale of used rental equipment	(25,441)	(19,329)	(21,309)
Foreign currency exchange loss (gain)	210	(78)	(84)
Amortization of debt issuance costs	15	11	11
Change in:
Accounts receivable	(24,397)	3,440	(7,323)
Prepaid expenses and other assets	(6,816)	3,807	(13,530)
Accounts payable and accrued liabilities	12,226	316	20,298
Deferred income	9,082	(8,989)	5,138
Deferred income taxes	26,348	(2,193)	11,606
Net cash provided by operating activities	195,743	180,504	187,994
Cash Flows from Investing Activities:
Purchases of rental equipment	(114,145)	(86,329)	(167,703)
Purchases of property, plant and equipment	(2,680)	(13,724)	(12,080)
Cash paid for acquisition of businesses	(283,123)		(7,808)
Cash paid for acquisition of business assets	(6,585)
Cash paid for acquisition of non-compete agreements	(2,500)
Proceeds from sales of used rental equipment	57,337	47,052	44,447
Net cash used in investing activities	(351,696)	(53,001)	(143,144)
Cash Flows from Financing Activities:
Net borrowing (repayment) under bank lines of credit	143,729	(70,689)	(5,144)
Borrowings under note purchase agreement	100,000
Principal payment of Series B senior notes	(40,000)
Repurchase of common stock		(13,617)
Taxes paid related to net share settlement of stock awards	(5,345)	(4,376)	(3,333)
Payment of dividends	(42,182)	(39,769)	(35,539)
Net cash provided by (used in) financing activities	156,202	(128,451)	(44,016)
Effect of foreign currency exchange rate changes on cash	4	(156)
Net increase (decrease) in cash	253	(1,104)	834
Cash balance, beginning of period	1,238	2,342	1,508
Cash balance, end of period	1,491	1,238	2,342
Supplemental Disclosure of Cash Flow Information:
Interest paid, during the period	10,326	9,050	12,475
Net income taxes paid, during the period	9,087	34,903	17,528
Dividends accrued during the period, not yet paid	11,280	10,083	9,489
Rental equipment acquisitions, not yet paid	$ 5,750	$ 4,373	$ 6,496