Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income (loss)	$ (12,087)	$ 37,330
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	13,613	13,276
Amortization of deferred financing costs	260	257
Gain on sale of assets	(3,010)	(2,552)
Stock compensation expense	10,479	7,429
Deferred income tax (benefit) expense	(8,696)	237
Excess tax benefit related to share-based awards	(2,154)	(3,425)
Changes in current assets and liabilities:
Restricted cash	0	(450)
Accounts receivable, net	26,555	(3,896)
Inventories	(16,294)	(18,035)
Income taxes receivable	(1,704)	0
Other current assets	1,799	(4,957)
Accounts payable	(11,139)	12,617
Accrued liabilities	(1,045)	1,019
Income taxes payable	847	1,082
Interest payable	0	(35)
Net cash provided by operating activities	17,796	39,897
Cash flows from investing activities:
Capital expenditures	(11,078)	(13,494)
Proceeds from sale of assets	3,225	3,322
Payments for acquisitions, net of cash acquired	(1,250)	(5,704)
Purchase of patents and other intangible assets	(434)	(780)
Net cash used in investing activities	(9,537)	(16,656)
Cash flows from financing activities:
Repayments of indebtedness	(8,357)	(8,506)
Borrowings on revolving credit facility	291,916	305,750
Repayments on revolving credit facility	(279,832)	(317,798)
Debt issuance costs	(10)	(256)
Excess tax benefit related to share-based awards	2,154	3,425
Purchase of treasury stock related to share-based awards	(5,376)	(6,060)
Proceeds from sale of common stock	779	763
Repurchase of common stock	(7,299)	0
Proceeds from exercise of stock options	22	461
Proceeds from exercise of stock warrants	0	1,545
Proceeds from noncontrolling interest	7	0
Net cash used in financing activities	(5,996)	(20,676)
Effect of changes in exchange rates on cash and cash equivalents	(531)	(38)
Net increase in cash and cash equivalents	1,732	2,527
Cash and cash equivalents at the beginning of period	1,266	2,730
Cash and cash equivalents at the end of period	$ 2,998	$ 5,257