The interest rate for investments that have an interest rate. For fixed rate investments, this indicates the fixed interest rate. If the investment has a variable interest rate, the rate stated here may be the rate that is currently relevant. In this case the "Investment, Interest Rate is Current Rate for Variable Rate Investment Flag", "Investment, Interest Rate is Discount Rate at Purchase Flag", "Investment, Interest Rate Reflects Current Yield Flag" should be used. If one of these flags are not appropriate to explain the interest rate that is indicated, then a new flag should be added or an explanation should be included in "Investment, Additional Information".

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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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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Other investments not otherwise specified in the taxonomy.

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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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Investments - Schedule for Cost and Equity Method Investments (Details) (USD $)	3 Months Ended			12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Other investments	$ 24,156,000us-gaap_OtherInvestments		$ 24,639,000us-gaap_OtherInvestments	$ 24,639,000us-gaap_OtherInvestments
Equity in loss of unconsolidated affiliate	(483,000)	(479,000)
Synthonics
Schedule of Equity Method Investments [Line Items]
Cost method investments	2,170,000		2,170,000	2,170,000
Cost method, ownership percentage	18.30%		19.60%	19.60%
Mindjet
Schedule of Equity Method Investments [Line Items]
Other investments	24,600,000
Voting interest percentage	28.40%
Impairment on preferred shares			1,100,000
Minimum damages	0
Maximum damages	1,200,000
Equity Securities
Schedule of Equity Method Investments [Line Items]
Marketable equity securities, carrying value	18,403,000		21,990,000	21,990,000
Equity Securities \| Mindjet
Schedule of Equity Method Investments [Line Items]
Cost method investments	15,858,000		15,858,000	15,858,000
Cost method, ownership percentage	13.40%		13.40%	13.40%
Equity method investments	6,128,000		6,611,000	6,611,000
Equity method investments, ownership percentage	15.00%		15.00%	15.00%
Other investments	21,986,000		22,469,000	22,469,000
Voting interest percentage	28.40%		28.40%	28.40%
Convertible Debt Securities \| Mindjet
Schedule of Equity Method Investments [Line Items]
Purchased convertible debt				$ 2,700,000
Conversion ratio	3
Investment interest rate	10.00%