Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivables	$ 3,070	$ 3,651
Reserves for obsolescence inventories	716	647
Accumulated depreciation, rental equipment	342,132	309,944
Accumulated depreciation and amortization, property and equipment	85,451	75,994
Accumulated amortization, deferred financing costs	10,891	10,176
Unaccreted discount, net	$ 1,328	$ 1,454
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	175,000,000	175,000,000
Common stock, shares issued	39,100,021	39,023,594
Common stock, shares outstanding	35,236,466	35,200,398
Treasury stock, shares	3,863,555	3,823,196