Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenues	$ 2,308,265us-gaap_SalesRevenueGoodsNet	$ 2,069,193us-gaap_SalesRevenueGoodsNet	$ 1,840,739us-gaap_SalesRevenueGoodsNet
Cost of sales	(1,488,816)us-gaap_CostOfGoodsSold	(1,364,764)us-gaap_CostOfGoodsSold	(1,274,142)us-gaap_CostOfGoodsSold
Gross profit	819,449us-gaap_GrossProfit	704,429us-gaap_GrossProfit	566,597us-gaap_GrossProfit
Selling, general and administrative expenses	(487,945)	(378,009)	(345,926)
Research and development	(113,914)us-gaap_ResearchAndDevelopmentExpense	(83,277)us-gaap_ResearchAndDevelopmentExpense	(65,410)us-gaap_ResearchAndDevelopmentExpense
Amortization of intangibles	(58,426)us-gaap_AmortizationOfIntangibleAssets	(50,803)us-gaap_AmortizationOfIntangibleAssets	(22,792)us-gaap_AmortizationOfIntangibleAssets
Income from equity method investment	3,955	8,922	9,704
Asset impairment and loss on sale of assets			(33,676)
Operating income	163,119us-gaap_OperatingIncomeLoss	201,262us-gaap_OperatingIncomeLoss	108,497us-gaap_OperatingIncomeLoss
Interest expense	(82,156)us-gaap_InterestExpense	(73,095)us-gaap_InterestExpense	(52,038)us-gaap_InterestExpense
Interest income	583us-gaap_InvestmentIncomeInterest	494us-gaap_InvestmentIncomeInterest	1,033us-gaap_InvestmentIncomeInterest
Loss on debt extinguishment		(1,612)	(52,450)
Income from continuing operations before taxes	81,546	127,049	5,042
Income tax benefit (expense)	(7,114)us-gaap_IncomeTaxExpenseBenefit	(22,315)us-gaap_IncomeTaxExpenseBenefit	38,194us-gaap_IncomeTaxExpenseBenefit
Income from continuing operations	74,432	104,734	43,236
Income (loss) from discontinued operations, net of tax	579	(1,421)	16,774
Gain (loss) from disposal of discontinued operations, net of tax	(562)		134,480
Net income	$ 74,449us-gaap_NetIncomeLoss	$ 103,313us-gaap_NetIncomeLoss	$ 194,490us-gaap_NetIncomeLoss
Weighted average number of common shares and equivalents:
Basic	43,273	43,871	45,097
Diluted	43,997	44,737	45,942
Basic income (loss) per share:
Continuing operations	$ 1.72	$ 2.39	$ 0.96
Discontinued operations	$ 0.01	$ (0.03)	$ 0.37
Disposal of discontinued operations	$ (0.01)		$ 2.98
Net income	$ 1.72us-gaap_EarningsPerShareBasic	$ 2.36us-gaap_EarningsPerShareBasic	$ 4.31us-gaap_EarningsPerShareBasic
Diluted income (loss) per share:
Continuing operations	$ 1.69	$ 2.34	$ 0.94
Discontinued operations	$ 0.01	$ (0.03)	$ 0.36
Disposal of discontinued operations	$ (0.01)		$ 2.93
Net income	$ 1.69us-gaap_EarningsPerShareDiluted	$ 2.31us-gaap_EarningsPerShareDiluted	$ 4.23us-gaap_EarningsPerShareDiluted

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration