Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities
Net income	$ 10,784	$ 5,853
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,674	19,355
Stock-based compensation	3,900	4,108
Amortization of prepaid debt fees	276	390
Deferred taxes, net	4,507	(4,932)
Restructuring, non-cash	1,114	(110)
Other adjustments, net	66	337
Changes in operating assets and liabilities:
Accounts receivable	(33,308)	237
Inventories	3,244	(23,732)
Other current assets	(5,457)	(7,888)
Other long-term assets	2,945	(3,081)
Accounts payable, other current liabilities, and taxes payable	10,161	3,760
Wages and benefits payable	9,349	(9,913)
Unearned revenue	14,343	14,582
Warranty	(4,045)	2,384
Other operating, net	(748)	(5,305)
Net cash provided by (used in) operating activities	33,805	(3,955)
Investing activities
Acquisitions of property, plant, and equipment	(8,791)	(9,472)
Other investing, net	558	(118)
Net cash used in investing activities	(8,233)	(9,590)
Financing activities
Proceeds from borrowings	0	63,000
Payments on debt	(23,406)	(22,373)
Issuance of common stock	660	451
Repurchase of common stock	0	(16,341)
Other financing, net	(2,289)	1,186
Net cash provided by (used in) financing activities	(25,035)	25,923
Effect of foreign exchange rate changes on cash and cash equivalents	1,060	(6,665)
Increase in cash and cash equivalents	1,597	5,713
Cash and cash equivalents at beginning of period	131,018	112,371
Cash and cash equivalents at end of period	132,615	118,084
Supplemental disclosure of cash flow information:
Income taxes, net	3,680	19,245
Interest, net of amounts capitalized	$ 2,624	$ 2,265