Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income (loss)	$ (14,062)	$ 23,058
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Impairment of inventory and rental equipment	20,372	0
Depreciation and amortization	9,181	8,814
Amortization of deferred financing costs	173	148
Gain on sale of assets	(2,023)	(1,389)
Stock compensation expense	6,910	4,756
Deferred income tax benefit	(9,315)	(446)
Excess tax benefit related to share-based awards	(2,149)	(3,373)
Changes in current assets and liabilities:
Accounts receivable, net	22,158	(549)
Inventories	(16,474)	(18,828)
Income taxes receivable	(947)	0
Other current assets	3,864	(5,323)
Accounts payable	(6,045)	10,737
Accrued liabilities	(1,038)	(683)
Income taxes payable	842	1,540
Interest payable	13	(22)
Net cash provided by operating activities	11,460	18,440
Cash flows from investing activities:
Capital expenditures	(8,963)	(9,245)
Proceeds from sale of assets	2,188	1,982
Payments for acquisitions, net of cash acquired	(1,250)	(5,704)
Purchase of patents and other intangible assets	(292)	(595)
Net cash used in investing activities	(8,317)	(13,562)
Cash flows from financing activities:
Repayments of indebtedness	(6,571)	(6,720)
Borrowings on revolving credit facility	204,150	204,750
Repayments on revolving credit facility	(189,461)	(203,226)
Debt issuance costs	(10)	(127)
Excess tax benefit related to share-based awards	2,149	3,373
Purchase of treasury stock related to share-based awards	(5,339)	(5,961)
Proceeds from sale of common stock	543	505
Repurchase of common stock	(7,260)	0
Proceeds from exercise of stock options	22	450
Proceeds from exercise of stock warrants	0	1,545
Proceeds from noncontrolling interest	7	0
Net cash used in financing activities	(1,770)	(5,411)
Effect of changes in exchange rates on cash and cash equivalents	(164)	29
Net increase (decrease) in cash and cash equivalents	1,209	(504)
Cash and cash equivalents at the beginning of period	1,266	2,730
Cash and cash equivalents at the end of period	$ 2,475	$ 2,226