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	3 Months Ended
	Mar. 31, 2015
Convertible Debt Securities [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at December 31, 2014	$ 6,073
Purchases of Level 3 securities	1,000
Total net realized losses included in earnings	(100)
Balance at March 31, 2015	$ 6,973