Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Cash Flows from Operating Activities:
Net income	$ 40,470	$ 45,709	$ 43,397
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	84,280	81,125	76,849
Provision for doubtful accounts	2,149	1,825	2,144
Share-based compensation	3,399	3,854	3,680
Gain on sale of used rental equipment	(11,902)	(15,368)	(13,091)
Gain on sale of property, plant and equipment		(812)
Foreign currency exchange loss	488	331	189
Change in:
Accounts receivable	3,882	(15,469)	2,462
Income taxes receivable	(11,000)
Prepaid expenses and other assets	12,708	(13,652)	(8,265)
Accounts payable and accrued liabilities	(1,520)	10,662	6,506
Deferred income	7,149	5,136	(2,921)
Deferred income taxes	14,449	19,645	22,693
Net cash provided by operating activities	144,552	122,986	133,643
Cash Flows from Investing Activities:
Purchases of rental equipment	(131,037)	(152,197)	(132,611)
Purchases of property, plant and equipment	(9,321)	(12,740)	(11,973)
Proceeds from sale of used rental equipment	26,214	32,556	33,380
Proceeds from sale of property, plant and equipment		2,501
Net cash used in investing activities	(114,144)	(129,880)	(111,204)
Cash Flows from Financing Activities:
Net borrowings (repayments) under bank lines of credit	18,963	12,475	(11,997)
Principal payments on Series A senior notes	(20,000)	(20,000)
Proceeds from the exercise of stock options	2,149	1,729	15,067
Excess tax benefit (shortfall) from exercise of stock options	(292)	1,822	1,329
Taxes paid related to net share settlement of stock awards	(1,560)	(3,959)	(2,395)
Repurchase of common stock	(63,953)
Payment of dividends	(25,779)	(25,551)	(24,423)
Net cash provided by (used in) financing activities	(30,472)	6,516	(22,419)
Effect of foreign currency exchange rate changes on cash		(85)	(2)
Net increase (decrease) in cash	(64)	(463)	18
Cash balance, beginning of period	1,167	1,630	1,612
Cash balance, end of period	1,103	1,167	1,630
Supplemental Disclosure of Cash Flow Information:
Interest paid, during the period	10,041	9,074	8,813
Net income taxes paid, during the period	2,498	22,275	11,074
Dividends accrued during the period, not yet paid	6,019	6,526	6,373
Rental equipment acquisitions, not yet paid	7,280	4,942	$ 8,533
Series B Senior Notes
Cash Flows from Financing Activities:
Borrowings		$ 40,000
Series C Senior Notes
Cash Flows from Financing Activities:
Borrowings	$ 60,000