Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Net income	$ 6,846us-gaap_NetIncomeLoss	$ 7,871us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,906	19,932
Provision for doubtful accounts	333us-gaap_ProvisionForDoubtfulAccounts	456us-gaap_ProvisionForDoubtfulAccounts
Non-cash share-based compensation	931us-gaap_ShareBasedCompensation	955us-gaap_ShareBasedCompensation
Gain on sale of used rental equipment	(2,869)us-gaap_GainLossOnSaleOfProperties	(2,500)us-gaap_GainLossOnSaleOfProperties
Foreign currency exchange loss	168	88
Change in:
Accounts receivable	11,600	4,123
Prepaid expenses and other assets	6,137	2,587
Accounts payable and accrued liabilities	(6,421)	2,740
Deferred income	220	(2,315)
Deferred income taxes	(3,218)	4,115
Net cash provided by operating activities	34,633	38,052
Cash Flows from Investing Activities:
Purchase of rental equipment	(29,974)	(31,759)
Purchase of property, plant and equipment	(3,005)	(2,812)
Proceeds from sale of used rental equipment	6,111	6,430
Net cash used in investing activities	(26,868)	(28,141)
Cash Flows from Financing Activities:
Net repayments under bank lines of credit	(1,555)	(41,922)
Borrowing under Series B senior notes		40,000
Proceeds from the exercise of stock options	958	76
Excess tax benefit from exercise and disqualifying disposition of stock options	19	508
Taxes paid related to net share settlement of stock awards	(582)	(2,512)
Repurchase of common stock	(377)
Payment of dividends	(6,639)us-gaap_PaymentsOfDividends	(6,489)us-gaap_PaymentsOfDividends
Net cash used in financing activities	(8,176)	(10,339)
Effect of foreign currency exchange rate changes on cash	21	9
Net decrease in cash	(390)	(419)
Cash balance, beginning of period	1,167	1,630
Cash balance, end of period	777	1,211
Interest paid, during the period	2,008us-gaap_InterestPaid	1,157us-gaap_InterestPaid
Net income taxes paid, during the period	316us-gaap_IncomeTaxesPaidNet	339us-gaap_IncomeTaxesPaidNet
Dividends accrued during the period, not yet paid	6,552	6,387
Rental equipment acquisitions, not yet paid	$ 10,220	$ 7,464

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-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.5)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 5

-Article 5

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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