Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Net income	$ 31,021	$ 31,286
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	29,468	35,481
Stock-based compensation	10,135	7,878
Amortization of prepaid debt fees	533	534
Deferred taxes, net	7,077	9,706
Restructuring, non-cash	80	(131)
Other adjustments, net	2,395	(366)
Changes in operating assets and liabilities:
Accounts receivable	(2,032)	(35,283)
Inventories	(29,470)	2,882
Other current assets	(3,905)	(10,549)
Other long-term assets	2,186	2,667
Accounts payable, other current liabilities, and taxes payable	36,861	(735)
Wages and benefits payable	12,299	14,709
Unearned revenue	6,701	5,513
Warranty	(4,825)	(9,065)
Other operating, net	(5,080)	(3,400)
Net cash provided by operating activities	93,444	51,127
Investing activities
Acquisitions of property, plant, and equipment	(21,898)	(19,884)
Business acquisitions, net of cash and cash equivalents acquired	(99,477)	(951)
Other investing, net	(456)	(974)
Net cash used in investing activities	(121,831)	(21,809)
Financing activities
Proceeds from borrowings	35,000	0
Payments on debt	(20,625)	(26,218)
Issuance of common stock	2,198	1,956
Other financing, net	952	(4,679)
Net cash provided provided by (used in) financing activities	17,525	(28,941)
Effect of foreign exchange rate changes on cash and cash equivalents	5,177	619
Increase (decrease) in cash and cash equivalents	(5,685)	996
Cash and cash equivalents at beginning of period	133,565	131,018
Cash and cash equivalents at end of period	127,880	132,014
Supplemental disclosure of cash flow information:
Income taxes, net	14,480	10,545
Interest, net of amounts capitalized	$ 5,021	$ 5,064