Investments (Tables)

12 Months Ended

Dec. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Schedule Of Available-For-Sale Securities

Investments in available-for-sale securities at fair value were as follows for the periods ended (in thousands):

	December 31, 2016									December 31, 2015
Description of the Securities	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Agency securities	$	411,963	$	699	$	(1,169	)	$	411,493	$	530,981	$	757	$	(1,216	)	$	530,522
Corporate securities	843,037		193		(2,114		)	841,116		699,210		90		(1,929		)	697,371
Municipal securities	9,989		3		(4		)	9,988		14,872		14		(8		)	14,878
Government securities	445,083		135		(600		)	444,618		152,376		9		(340		)	152,045
Total	$	1,710,072	$	1,030	$	(3,887	)	$	1,707,215	$	1,397,439	$	870	$	(3,493	)	$	1,394,816