Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Cash Flows from Operating Activities:
Net income	$ 38,251	$ 40,470	$ 45,709
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	81,179	84,280	81,125
Provision for doubtful accounts	1,892	2,149	1,825
Share-based compensation	3,091	3,399	3,854
Gain on sale of used rental equipment	(13,739)	(11,902)	(15,368)
Gain on sale of property, plant and equipment			(812)
Foreign currency exchange loss	121	488	331
Amortization of debt issuance cost	51	52	14
Change in:
Accounts receivable	(3,752)	3,628	(15,607)
Income taxes receivable	11,000	(11,000)
Prepaid expenses and other assets	3,219	12,910	(13,528)
Accounts payable and accrued liabilities	11,492	(1,520)	10,662
Deferred income	1,211	7,149	5,136
Deferred income taxes	7,745	14,449	19,645
Net cash provided by operating activities	141,761	144,552	122,986
Cash Flows from Investing Activities:
Purchases of rental equipment	(79,038)	(131,037)	(152,197)
Purchases of property, plant and equipment	(10,548)	(9,321)	(12,740)
Proceeds from sale of used rental equipment	29,406	26,214	32,556
Proceeds from sale of property, plant and equipment			2,501
Net cash used in investing activities	(60,180)	(114,144)	(129,880)
Cash Flows from Financing Activities:
Net borrowings (repayments) under bank lines of credit	(35,066)	18,963	12,475
Principal payments on Series A senior notes	(20,000)	(20,000)	(20,000)
Proceeds from the exercise of stock options	37	2,149	1,729
Excess tax benefit (shortfall) from exercise of stock awards	(1,066)	(292)	1,822
Taxes paid related to net share settlement of stock awards	(1,287)	(1,560)	(3,959)
Repurchase of common stock		(63,953)
Payment of dividends	(24,448)	(25,779)	(25,551)
Net cash provided by (used in) financing activities	(81,830)	(30,472)	6,516
Effect of foreign currency exchange rate changes on cash	(2)		(85)
Net decrease in cash	(251)	(64)	(463)
Cash balance, beginning of period	1,103	1,167	1,630
Cash balance, end of period	852	1,103	1,167
Supplemental Disclosure of Cash Flow Information:
Interest paid, during the period	12,436	10,041	9,074
Net income taxes paid, during the period	15,555	2,498	22,275
Dividends accrued during the period, not yet paid	6,147	6,019	6,526
Rental equipment acquisitions, not yet paid	$ 2,876	7,280	4,942
Series B Senior Notes
Cash Flows from Financing Activities:
Borrowings			$ 40,000
Series C Senior Notes
Cash Flows from Financing Activities:
Borrowings		$ 60,000