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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Fair Value Measurements (Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Cost method investments	$ 16,600,000us-gaap_CostMethodInvestments	$ 24,300,000us-gaap_CostMethodInvestments
Cost method investments, fair value of impaired investment	0	5,600,000
Cost method investment, impairment charge	8,300,000	3,700,000	3,500,000
Impaired investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Cost method investments	8,300,000	9,300,000
Convertible debt securities \| Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at December 31, 2013	10,291,000
Purchases of Level 3 securities	2,050,000
Proceeds received on Level 3 securities	(10,441,000)
Total net realized gains included in earnings	3,441,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	732,000
Balance at December 31, 2014	6,073,000
Other (expense) income, net \| Convertible debt securities \| Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total net realized gains included in earnings	$ 3,900,000