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Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Goodwill
Gross carrying Amount, beginning balance	$ 186,589us-gaap_GoodwillGross	$ 151,069us-gaap_GoodwillGross
Accumulated Impairment, beginning balance	95,241	95,241
Net Amount, beginning balance	91,348us-gaap_Goodwill	55,828us-gaap_Goodwill
Acquisition	51,396us-gaap_GoodwillAcquiredDuringPeriod	35,520us-gaap_GoodwillAcquiredDuringPeriod
Purchase price adjustment	173
Impairments	27,958us-gaap_GoodwillImpairmentLoss
Gross carrying Amount, ending balance	238,158us-gaap_GoodwillGross	186,589us-gaap_GoodwillGross	151,069us-gaap_GoodwillGross	238,158us-gaap_GoodwillGross
Accumulated Impairment, ending balance	123,199	95,241	95,241	123,199
Net Amount, ending balance	114,959us-gaap_Goodwill	91,348us-gaap_Goodwill	55,828us-gaap_Goodwill	114,959us-gaap_Goodwill
Asset impairment	58,170us-gaap_AssetImpairmentCharges	1,220us-gaap_AssetImpairmentCharges	1,335us-gaap_AssetImpairmentCharges
Certain tangible assets
Goodwill
Asset impairment				3,600
Goodwill
Goodwill
Asset impairment				28,000
Other long-lived assets
Goodwill
Asset impairment				25,900
Other long-lived assets \| Customer relationship
Goodwill
Asset impairment				17,400
Other long-lived assets \| IPR&D
Goodwill
Asset impairment				$ 4,800