Description of the Company (Tables)

12 Months Ended

Dec. 31, 2015

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Change in Credit Portion of Other-Than-Temporary Impairments Recognized in Earnings on Debt Securities

The following table presents the change in the credit portion of the other-than-temporary impairments recognized in earnings on debt securities for which a portion of the other-than-temporary impairments related to other factors was recognized in other comprehensive income (loss) for the years ended December 31, 2015, 2014 and 2013.

	December 31,
	2015			2014		2013
	(in thousands)
Cumulative credit loss on debt securities held at beginning of period	$	18,179		$	16,478	$	16,478
Addition to credit loss for which an other-than-temporary impairment was previously recognized		—			1,701		—
Accumulated losses on securities that matured or were sold during the year		(18,179	)		—		—
Cumulative credit loss on debt securities held at end of period	$	—		$	18,179	$	16,478