Investments - Equity Method Investments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	May 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Carrying Value	$ 32,728		$ 32,728			$ 8,339
Income (Loss) Recognized	(4,843)	(138)	(3,402)	(218)
Again Faster
Schedule of Equity Method Investments [Line Items]
Ownership (as a percent)	40.00%		40.00%			40.00%
Carrying Value	3,115		3,115			3,671
Income (Loss) Recognized	(263)	(138)	(556)	(218)
iGo
Schedule of Equity Method Investments [Line Items]
Ownership (as a percent)	46.90%		46.90%			44.70%
Carrying Value	2,742		2,742			4,668
Income (Loss) Recognized	(121)	0	(1,926)	0
API
Schedule of Equity Method Investments [Line Items]
Ownership (as a percent)	20.60%		20.60%		20.60%
Carrying Value	26,871		26,871			0
Income (Loss) Recognized	$ (4,459)	$ 0	$ (920)	$ 0