Investments - Schedule for Cost and Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Other investments	$ 3,482		$ 3,482		$ 3,482
Equity in loss of unconsolidated affiliate		$ 1,942		$ 3,422
Impairment on preferred shares				20,696
Synthonics
Schedule of Equity Method Investments [Line Items]
Cost method investments	$ 2,170		$ 2,170		$ 2,170
Cost method, ownership percentage	18.20%		18.20%		18.20%
Mindjet
Schedule of Equity Method Investments [Line Items]
Other investments	$ 2,300		$ 2,300		$ 2,200
Impairment on preferred shares		20,700		20,700
Equity Securities | Mindjet
Schedule of Equity Method Investments [Line Items]
Cost method investments	$ 1,312		$ 1,312		$ 1,312
Voting interest percentage	19.30%		19.30%		19.30%
Equity method investments		$ 0		$ 0