Fair Value Measurements (Assets and Liabilities on a Nonrecurring Basis) (Details) - Nonrecurring [Member] - Level 3 [Member] - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost-method investments, aggregate carrying amount, evaluated for impairment during the period	$ 1,000,000		$ 1,200,000
Cost method investments, fair value after impairment	100,000		100,000
Other Income (Expense) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of intangible assets	$ 900,000	$ 0	$ 1,100,000
Cost method investment, impairment charge included other income		$ 0		$ 3,000,000