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Investments - Equity Method Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	May 31, 2014	Jan. 31, 2015
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 38,808us-gaap_EquityMethodInvestments		$ 30,060us-gaap_EquityMethodInvestments
Income (Loss) Recognized	(2,110)	(1,433)
Again Faster
Schedule of Equity Method Investments [Line Items]
Ownership (as a percent)	40.00%		40.00%
Carrying Value	2,683		3,105
Income (Loss) Recognized	(422)	(129)
iGo
Schedule of Equity Method Investments [Line Items]
Ownership (as a percent)	46.90%		46.90%
Carrying Value	2,885		2,600
Income (Loss) Recognized	285	(1,304)
API
Schedule of Equity Method Investments [Line Items]
Ownership (as a percent)	20.60%		20.60%	20.60%
Carrying Value	23,669		24,355
Income (Loss) Recognized	(686)	0
Aviat
Schedule of Equity Method Investments [Line Items]
Ownership (as a percent)	12.90%				12.90%
Carrying Value	9,571
Income (Loss) Recognized	$ (1,287)	$ 0

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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