Fair Value Measurements Schedule of Activity of Major Classes of Assets Measured at Fair Value Using Level 3 Inputs (Details) (Level 3 [Member], USD $)	9 Months Ended
	Sep. 30, 2013
Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance as of January 1, 2013, other assets	$ 0
Balance as of January 1, 2013, other liabilities	(1,200,000)
Fair value adjustment to contingent consideration for acquisition of Verivue included in general and administrative expense	1,200,000
Convertible note receivable from divestiture of a business	18,882,000
Unrealized gain on convertible note receivable included in other comprehensive income	2,313,000
Balance as of September 30, 2013, other assets	21,195,000
Balance as of Setember 30, 2013, other liabilities	$ 0