Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Unrealized gain on investments, tax expense (benefit)	$ 12	$ 36	$ 31	$ 4
Unrealized (loss) gain, tax (benefit) expense	(1,233)	(890)	1,849	(1,013)
Reclassification adjustment for losses (gains) included in net income, tax benefit (expense)	$ (1,451)	$ 138	$ (2,704)	$ 91