Consolidating Financial Information Consolidating Statement of Cash Flows (Details) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating activities
Net income	$ 61,556	$ 50,561
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Depreciation and amortization	64,299	65,071
Stock-based compensation	9,518	9,121
Amortization of prepaid debt fees	2,265	2,762
Amortization of convertible debt discount	5,336	4,957
Deferred taxes, net	6,081	(8,132)
Equity in losses of guarantor and non-guarantor subsidiaries, net	0	0
Other adjustments, net	285	3,306
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	(12,106)	(52,124)
Inventories	(36,668)	(40,930)
Other current assets	(21,268)	8,375
Other long-term assets	(22,993)	(763)
Accounts payables, other current liabilities, and taxes payable	16,523	42,463
Wages and benefits payable	(21,531)	19,648
Unearned revenue	24,159	2,365
Warranty	9,510	14,355
Intercompany transactions, net	0	0
Other operating, net	2,726	(3,949)
Net cash provided by operating activities	87,692	117,086
Investing activities
Acquisitions of property, plant, and equipment	(28,712)	(27,716)
Business acquisition, net of cash equivalents acquired	(14,635)	0
Current intercompany notes, net	0	0
Other investing, net	513	4,495
Net cash provided by (used in) investing activities	(42,834)	(23,221)
Financing activities
Payments on debt	(55,630)	(73,881)
Issuance of common stock	2,553	6,812
Current intercompany notes, net	0	0
Other financing, net	(319)	(2,237)
Net cash used in financing activities	(53,396)	(69,306)
Effect of foreign exchange rate changes on cash and cash equivalents	7,345	(9,081)
Increase (decrease) in cash and cash equivalents	(1,193)	15,478
Cash and cash equivalents at beginning of period	169,477	121,893
Cash and cash equivalents at end of period	168,284	137,371
Non-cash transactions:
Property, plant, and equipment purchased but not yet paid, net	978	(3,491)
Fair value of contingent and deferred consideration payable for business acquisition	5,108	0
Supplemental disclosure of cash flow information:
Income taxes paid, net	6,842	9,355
Interest, net of amounts capitalized	15,927	21,178
Parent Company [Member]
Operating activities
Net income	61,556	50,561
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Depreciation and amortization	22,314	22,655
Stock-based compensation	9,518	9,121
Amortization of prepaid debt fees	2,265	2,762
Amortization of convertible debt discount	5,336	4,957
Deferred taxes, net	17,948	2,639
Equity in losses of guarantor and non-guarantor subsidiaries, net	(23,867)	(14,549)
Other adjustments, net	(209)	1,972
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	22,209	(33,080)
Inventories	(11,789)	(33,896)
Other current assets	750	6,504
Other long-term assets	(11,410)	1,215
Accounts payables, other current liabilities, and taxes payable	4,585	22,873
Wages and benefits payable	(19,329)	16,928
Unearned revenue	9,875	(330)
Warranty	(30)	3,692
Intercompany transactions, net	3,207	2,784
Other operating, net	(1,159)	68
Net cash provided by operating activities	91,770	66,876
Investing activities
Acquisitions of property, plant, and equipment	(14,579)	(15,490)
Business acquisition, net of cash equivalents acquired	0
Current intercompany notes, net	106	27,259
Other investing, net	34,541	2,572
Net cash provided by (used in) investing activities	20,068	14,341
Financing activities
Payments on debt	(55,630)	(73,881)
Issuance of common stock	2,553	6,812
Current intercompany notes, net	1,668	(3,466)
Other financing, net	(538)	(1,340)
Net cash used in financing activities	(51,947)	(71,875)
Effect of foreign exchange rate changes on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	59,891	9,342
Cash and cash equivalents at beginning of period	19,146	16,385
Cash and cash equivalents at end of period	79,037	25,727
Non-cash transactions:
Property, plant, and equipment purchased but not yet paid, net	2,114	(245)
Fair value of contingent and deferred consideration payable for business acquisition	0
Supplemental disclosure of cash flow information:
Income taxes paid, net	(1,028)	9,191
Interest, net of amounts capitalized	15,719	20,958
Guarantor Subsidiary [Member]
Operating activities
Net income	1,668	1,534
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Depreciation and amortization	0	0
Stock-based compensation	0	0
Amortization of prepaid debt fees	0	0
Amortization of convertible debt discount	0	0
Deferred taxes, net	0	0
Equity in losses of guarantor and non-guarantor subsidiaries, net	0	0
Other adjustments, net	0	0
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	0	0
Inventories	0	0
Other current assets	0	0
Other long-term assets	0	0
Accounts payables, other current liabilities, and taxes payable	0	0
Wages and benefits payable	0	0
Unearned revenue	0	0
Warranty	0	0
Intercompany transactions, net	0	0
Other operating, net	0	0
Net cash provided by operating activities	1,668	1,534
Investing activities
Acquisitions of property, plant, and equipment	0	0
Business acquisition, net of cash equivalents acquired	0
Current intercompany notes, net	(1,668)	(1,534)
Other investing, net	0	0
Net cash provided by (used in) investing activities	(1,668)	(1,534)
Financing activities
Payments on debt	0	0
Issuance of common stock	0	0
Current intercompany notes, net	0	0
Other financing, net	0	0
Net cash used in financing activities	0	0
Effect of foreign exchange rate changes on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Non-cash transactions:
Property, plant, and equipment purchased but not yet paid, net	0	0
Fair value of contingent and deferred consideration payable for business acquisition	0
Supplemental disclosure of cash flow information:
Income taxes paid, net	0	0
Interest, net of amounts capitalized	0	0
Combined Non-Guarantor Subsidiaries [Member]
Operating activities
Net income	22,199	13,015
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Depreciation and amortization	41,985	42,416
Stock-based compensation	0	0
Amortization of prepaid debt fees	0	0
Amortization of convertible debt discount	0	0
Deferred taxes, net	(11,867)	(10,771)
Equity in losses of guarantor and non-guarantor subsidiaries, net	0	0
Other adjustments, net	494	1,334
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	(34,315)	(19,044)
Inventories	(24,879)	(7,034)
Other current assets	(22,018)	1,871
Other long-term assets	(11,583)	(1,978)
Accounts payables, other current liabilities, and taxes payable	11,938	19,590
Wages and benefits payable	(2,202)	2,720
Unearned revenue	14,284	2,695
Warranty	9,540	10,663
Intercompany transactions, net	(3,207)	(2,784)
Other operating, net	3,885	(4,017)
Net cash provided by operating activities	(5,746)	48,676
Investing activities
Acquisitions of property, plant, and equipment	(14,133)	(12,226)
Business acquisition, net of cash equivalents acquired	(14,635)
Current intercompany notes, net	0	5,000
Other investing, net	(34,028)	1,923
Net cash provided by (used in) investing activities	(62,796)	(5,303)
Financing activities
Payments on debt	0	0
Issuance of common stock	0	0
Current intercompany notes, net	(106)	(27,259)
Other financing, net	219	(897)
Net cash used in financing activities	113	(28,156)
Effect of foreign exchange rate changes on cash and cash equivalents	7,345	(9,081)
Increase (decrease) in cash and cash equivalents	(61,084)	6,136
Cash and cash equivalents at beginning of period	150,331	105,508
Cash and cash equivalents at end of period	89,247	111,644
Non-cash transactions:
Property, plant, and equipment purchased but not yet paid, net	(1,136)	(3,246)
Fair value of contingent and deferred consideration payable for business acquisition	5,108
Supplemental disclosure of cash flow information:
Income taxes paid, net	7,870	164
Interest, net of amounts capitalized	208	220
Eliminations [Member]
Operating activities
Net income	(23,867)	(14,549)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Depreciation and amortization	0	0
Stock-based compensation	0	0
Amortization of prepaid debt fees	0	0
Amortization of convertible debt discount	0	0
Deferred taxes, net	0	0
Equity in losses of guarantor and non-guarantor subsidiaries, net	23,867	14,549
Other adjustments, net	0	0
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	0	0
Inventories	0	0
Other current assets	0	0
Other long-term assets	0	0
Accounts payables, other current liabilities, and taxes payable	0	0
Wages and benefits payable	0	0
Unearned revenue	0	0
Warranty	0	0
Intercompany transactions, net	0	0
Other operating, net	0	0
Net cash provided by operating activities	0	0
Investing activities
Acquisitions of property, plant, and equipment	0	0
Business acquisition, net of cash equivalents acquired	0
Current intercompany notes, net	1,562	(30,725)
Other investing, net	0	0
Net cash provided by (used in) investing activities	1,562	(30,725)
Financing activities
Payments on debt	0	0
Issuance of common stock	0	0
Current intercompany notes, net	(1,562)	30,725
Other financing, net	0	0
Net cash used in financing activities	(1,562)	30,725
Effect of foreign exchange rate changes on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Non-cash transactions:
Property, plant, and equipment purchased but not yet paid, net	0	0
Fair value of contingent and deferred consideration payable for business acquisition	0
Supplemental disclosure of cash flow information:
Income taxes paid, net	0	0
Interest, net of amounts capitalized	$ 0	$ 0