Fair Value Measurements (Assets Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs) (Details) (Convertible Debt Securities [Member], Level 3 [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at December 31, 2013	$ 10,291
Purchases of Level 3 securities	1,300
Proceeds received on Level 3 securities	(7,875)
Total net realized gains included in earnings	2,375
Balance at September 30, 2014	6,091
Other Income (Expense) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total net realized gains included in earnings	$ 2,900