The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Investments - Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Jan. 31, 2015	Dec. 31, 2014	May. 31, 2014
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 36,100		$ 36,100			$ 30,060
Income (Loss) Recognized	$ (8,153)	$ (4,843)	$ (4,818)	$ (3,402)
Again Faster
Schedule of Equity Method Investments [Line Items]
Ownership (as a percent)	40.00%		40.00%			40.00%
Carrying Value	$ 0		$ 0			$ 3,105
Income (Loss) Recognized	$ (2,548)	(263)	$ (3,105)	(556)
iGo
Schedule of Equity Method Investments [Line Items]
Ownership (as a percent)	45.70%		45.70%			46.90%
Carrying Value	$ 2,923		$ 2,923			$ 2,600
Income (Loss) Recognized	$ 52	(121)	$ 323	(1,926)
API
Schedule of Equity Method Investments [Line Items]
Ownership (as a percent)	20.60%		20.60%			20.60%	20.60%
Carrying Value	$ 24,812		$ 24,812			$ 24,355
Income (Loss) Recognized	$ (3,888)	(4,459)	$ 457	(920)
Aviat
Schedule of Equity Method Investments [Line Items]
Ownership (as a percent)	12.90%		12.90%		12.90%
Carrying Value	$ 8,365		$ 8,365
Income (Loss) Recognized	$ (1,769)	$ 0	$ (2,493)	$ 0