Business Acquisition and Disposition Fair Value of Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands	Aug. 05, 2014	Apr. 12, 2014	Jun. 30, 2015	Dec. 31, 2014	Aug. 04, 2014
Business Acquisition [Line Items]
Goodwill			$ 43,538	$ 203,329
HiTek [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables		$ 2,867
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory		4,980
Business Acquisition, Purchase Price Allocation, Other Current Assets		415
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		1,291
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other		(3,836)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent		2,020
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities		22,725
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Tangible Assets		(14,988)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		12,590
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		(2,398)
Goodwill		(966)
Business Combination, Consideration Transferred		(3,364)
HiTek [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents					$ 758
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables					1,694
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory					2,599
Business Acquisition, Purchase Price Allocation, Other Current Assets					472
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment					424
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets					711
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent					(1,970)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other					(1,053)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Tangible Assets					3,635
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles					10,900
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net					14,535
Goodwill					16,609
Business Combination, Consideration Transferred	$ 31,144
Patented Technology [Member] | HiTek [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		$ 4,029
Finite-Lived Intangible Assets, Amortization Method		Straight-line
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		10 years
Patented Technology [Member] | HiTek [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles					2,100
Finite-Lived Intangible Assets, Amortization Method	Straight-line
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Trade Names [Member] | HiTek [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		$ 336
Finite-Lived Intangible Assets, Amortization Method		Straight-line
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		2 years 6 months
Trade Names [Member] | HiTek [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles					200
Finite-Lived Intangible Assets, Amortization Method	Straight-line
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	2 years 6 months
Customer Relationships [Member] | HiTek [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles					$ 8,600
Finite-Lived Intangible Assets, Amortization Method	Straight-line
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years
Customer Relationships [Member] | HiTek [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		$ 8,225
Finite-Lived Intangible Assets, Amortization Method		Straight-line
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		15 years