CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets
Allowance for doubtful accounts (owned fleet)	$ 896	$ 680
Accumulated depreciation on rental equipment	311,726	274,333
Accumulated depreciation on furniture, fixtures and equipment	2,232	2,019
Accumulated amortization on intangible assets	4,807	4,817
Cash attributable to variable interest entities	40,859	26,011
Net investment in direct financial leases	323	156
Rental equipment attributable to variable interest entities, net of accumulated depreciation	98,081	102,100
Liabilities and Stockholders' Equity
Collateralized financing obligations, current portion	80,201	0
Collateralized financing obligations, noncurrent portion	$ 64,029	$ 132,419
Stockholders' equity
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	84,000,000	84,000,000
Common stock, shares issued (in shares)	21,201,743	20,788,277
Common stock, shares outstanding (in shares)	21,201,743	20,788,277