Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities
Net income	$ 16,014	$ 10,784
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	14,378	16,674
Stock-based compensation	5,211	3,900
Amortization of prepaid debt fees	266	276
Deferred taxes, net	882	4,507
Restructuring, non-cash	0	1,114
Other adjustments, net	946	66
Changes in operating assets and liabilities:
Accounts receivable	13,119	(33,308)
Inventories	(11,274)	3,244
Other current assets	(11,169)	(5,457)
Other long-term assets	646	2,945
Accounts payable, other current liabilities, and taxes payable	28,277	10,161
Wages and benefits payable	(1,796)	9,349
Unearned revenue	14,020	14,343
Warranty	(2,303)	(4,045)
Other operating, net	(3,960)	(748)
Net cash provided by operating activities	63,257	33,805
Investing activities
Acquisitions of property, plant, and equipment	(9,122)	(8,791)
Other investing, net	(78)	558
Net cash used in investing activities	(9,200)	(8,233)
Financing activities
Payments on debt	(2,813)	(23,406)
Issuance of common stock	405	660
Other financing, net	155	(2,289)
Net cash provided used in financing activities	(2,253)	(25,035)
Effect of foreign exchange rate changes on cash and cash equivalents	2,559	1,060
Increase in cash and cash equivalents	54,363	1,597
Cash and cash equivalents at beginning of period	133,565	131,018
Cash and cash equivalents at end of period	187,928	132,615
Supplemental disclosure of cash flow information:
Income taxes, net	1,224	3,680
Interest, net of amounts capitalized	$ 2,422	$ 2,624