Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Unrealized gain (loss) on investments, tax expense (benefit)	$ 45	$ 12	$ 115	$ 31
Unrealized gain, tax expense	804	(1,233)	(639)	1,849
Reclassification adjustment for gains included in net income, tax expense	$ 54	$ (1,451)	$ (116)	$ (2,704)