Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 31,636	$ 32,841
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation and Amortization	57,097	53,665
Provision for Doubtful Accounts	1,347	1,775
Non-Cash Share-Based Compensation	3,382	3,154
Gain on Sale of Used Rental Equipment	(9,928)	(9,381)
Change In:
Accounts Receivable	(1,910)	(10,152)
Prepaid Expenses and Other Assets	(1,103)	(10,729)
Accounts Payable and Accrued Liabilities	8,855	3,580
Deferred Income	219	10,575
Deferred Income Taxes	10,321	15,680
Net Cash Provided by Operating Activities	99,916	91,008
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of Rental Equipment	(93,448)	(106,219)
Purchase of Property, Plant and Equipment	(7,962)	(11,025)
Proceeds from Sale of Used Rental Equipment	25,374	20,556
Net Cash Used in Investing Activities	(76,036)	(96,688)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net Borrowings (Repayments) Under Bank Lines of Credit	(21,098)	17,693
Proceeds from the Exercise of Stock Options	13,170	3,572
Excess Tax Benefit from Exercise and Disqualifying Disposition of Stock Options	1,345	844
Payment of Dividends	(18,258)	(17,296)
Net Cash Provided by (Used in) Financing Activities	(24,841)	4,813
Net Decrease in Cash	(961)	(867)
Cash Balance, beginning of period	1,612	1,229
Cash Balance, end of period	651	362
Interest Paid, during the period	5,607	5,854
Net Income Taxes Paid, during the period	7,930	4,633
Dividends Accrued, during the period, not yet paid	6,370	6,156
Rental Equipment Acquisitions, not yet paid	$ 7,367	$ 6,868