Income Taxes (Details 2) (USD $)																						12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Domestic	Dec. 31, 2012 Foreign	Dec. 31, 2012 State taxes	Dec. 31, 2012 Current deferred tax assets	Dec. 31, 2011 Current deferred tax assets	Dec. 31, 2012 Current deferred tax assets Domestic	Dec. 31, 2011 Current deferred tax assets Domestic	Dec. 31, 2012 Current deferred tax assets Foreign	Dec. 31, 2011 Current deferred tax assets Foreign	Dec. 31, 2012 Noncurrent deferred tax assets Domestic	Dec. 31, 2011 Noncurrent deferred tax assets Domestic	Dec. 31, 2012 Noncurrent deferred tax assets Foreign	Dec. 31, 2011 Noncurrent deferred tax assets Foreign	Dec. 31, 2012 Noncurrent deferred tax liabilities	Dec. 31, 2011 Noncurrent deferred tax liabilities	Dec. 31, 2012 Noncurrent deferred tax liabilities Domestic	Dec. 31, 2011 Noncurrent deferred tax liabilities Domestic	Dec. 31, 2012 Noncurrent deferred tax liabilities Foreign	Dec. 31, 2011 Noncurrent deferred tax liabilities Foreign	Dec. 31, 2012 Minimum [Member] Domestic	Dec. 31, 2012 Minimum [Member] Foreign	Dec. 31, 2012 Minimum [Member] State taxes	Dec. 31, 2012 Maximum [Member] Domestic	Dec. 31, 2012 Maximum [Member] Foreign	Dec. 31, 2012 Maximum [Member] State taxes
Income Taxes [Line Items]
Allowance for doubtful accounts								$ 1,123,000	$ 595,000
Accrued product warranties								3,099,000	2,964,000
Inventory basis differences								9,225,000	10,295,000
Accrued liabilities								7,206,000	9,499,000	0	1,402,000	6,033,000	0
Deferred revenue								2,205,000	2,568,000			0	5,599,000
Net operating loss carry-forwards								8,085,000	844,000			11,588,000	28,826,000	8,119,000	0
Credit carry-forwards												7,034,000	6,175,000	3,590,000	0
Domestic depreciation												(7,222,000)	(8,682,000)
Supplemental Executive Retirement Plan												7,491,000	7,684,000
Stock-based compensation												13,745,000	11,978,000
Intangibles												(15,999,000)	(22,436,000)	(1,259,000)	0
Other								(1,025,000)	(1,602,000)	1,042,000	878,000	4,018,000	7,561,000	(78,000)	0
Valuation allowance	(9,300,000)											(4,837,000)	(5,062,000)
Deferred income taxes, net	30,960,000	27,443,000				30,960,000	27,443,000
Deferred income taxes, net	32,223,000	31,644,000										32,223,000	31,643,000
Foreign depreciation																				3,196,000	3,431,000
Foreign intangibles																				(12,522,000)	(23,074,000)
Foreign net operating loss carry-forwards																				5,336,000	2,877,000
Foreign other																				504,000	1,189,000
Valuation allowance																		(4,510,000)	(1,660,000)
Deferred income taxes	7,996,000	17,237,000														7,996,000	17,237,000
Operating loss carry-forwards			57,900,000	93,500,000	79,500,000
Operating loss carryforwards, expiration dates																						2018	2018	2018	2031	2033	2031
Net deferred tax assets	55,200,000
Cumulative amount of earnings upon which United States income taxes have not been provided	$ 680,000,000