Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities
Net income (loss)	$ 35,053	$ 15,003	$ (22,300)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	68,318	75,993	98,139
Stock-based compensation	18,035	14,089	17,860
Amortization of prepaid debt fees	1,076	2,128	1,612
Deferred taxes, net	13,790	1,488	(34,757)
Restructuring, non-cash	7,188	976	5,172
Other adjustments, net	4,309	2,003	914
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(27,162)	(9,009)	(15,119)
Inventories	22,343	(52,737)	7,208
Other current assets	20,705	12,512	(10,947)
Other long-term assets	(339)	(3,721)	(12,540)
Accounts payables, other current liabilities, and taxes payable	(37,312)	(7,060)	56,158
Wages and benefits payable	7,808	(10,866)	7,502
Unearned revenue	(25,810)	11,943	30,584
Warranty	(10,246)	20,161	(7,297)
Other operating, net	18,086	447	10,784
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	115,842	73,350	132,973
Investing activities
Acquisitions of property, plant, and equipment	(43,543)	(43,918)	(44,495)
Payments to Acquire Businesses, Net of Cash Acquired	(951)	(5,754)	0
Other investing, net	(3,034)	721	2,999
Net cash used in investing activities	(47,528)	(48,951)	(41,496)
Financing activities
Proceeds from borrowings	15,877	113,467	47,657
Payments on debt	(79,119)	(62,998)	(102,438)
Issuance of common stock	2,891	2,663	3,647
Repurchase of common stock	0	(38,283)	(39,665)
Other financing, net	(2,672)	(7,109)	(1,078)
Net cash provided by (used in) financing activities	(63,023)	7,740	(91,877)
Effect of foreign exchange rate changes on cash and cash equivalents	(2,744)	(13,492)	(12,034)
Increase (decrease) in cash and cash equivalents	2,547	18,647	(12,434)
Cash and cash equivalents at beginning of period	131,018	112,371	124,805
Cash and cash equivalents at end of period	133,565	131,018	112,371
Supplemental disclosure of cash flow information:
Income taxes, net	24,287	29,189	18,222
Interest	$ 9,921	$ 10,198	$ 9,912