Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Operating activities
Net income	$ 19,726	$ 15,692
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	50,606	49,031
Stock-based compensation	9,454	10,122
Amortization of prepaid debt fees	808	829
Deferred taxes, net	(8,046)	(11,543)
Goodwill impairment	977	0
Restructuring expense, non-cash	0	27
Other adjustments, net	85	324
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	(14,712)	(4,278)
Inventories	(16,801)	(25,124)
Other current assets	(9,103)	(9,408)
Other long-term assets	312	4,489
Accounts payable, other current liabilities, and taxes payable	12,360	(10,280)
Wages and benefits payable	4,473	(5,661)
Unearned revenue	16,560	10,497
Warranty	(2,864)	(1,797)
Other operating, net	3,356	(3,946)
Net cash provided by operating activities	67,191	18,974
Investing activities
Acquisitions of property, plant, and equipment	(19,403)	(28,895)
Business acquisitions, net of cash and cash equivalents acquired	0	(860)
Other investing, net	56	241
Net cash used in investing activities	(19,347)	(29,514)
Financing activities
Proceeds from borrowings	0	15,000
Payments on debt	(51,250)	(22,500)
Issuance of common stock	1,530	2,590
Repurchase of common stock	(7,164)	(16,126)
Other financing, net	1,204	2,220
Net cash used in financing activities	(55,680)	(18,816)
Effect of foreign exchange rate changes on cash and cash equivalents	(2,189)	(3,393)
Increase (decrease) in cash and cash equivalents	(10,025)	(32,749)
Cash and cash equivalents at beginning of period	124,805	136,411
Cash and cash equivalents at end of period	114,780	103,662
Non-cash transactions:
Property, plant, and equipment purchased but not yet paid	2,445	7,284
Supplemental disclosure of cash flow information:
Income taxes, net	3,502	8,200
Interest, net of amounts capitalized	$ 4,911	$ 3,804