Liability for Unpaid Loss and Loss Adjustment Expenses (Tables)

12 Months Ended

Dec. 31, 2012

Liability for Unpaid Loss and Loss Adjustment Expenses [Abstract]

Summary of activity in the liability for unpaid loss and loss adjustment expenses

	Years Ended December 31,
	2012		2011		2010
	(dollars in thousands)
Unpaid loss and loss adjustment expenses, January 1	$	680,201	$	649,641	$	616,444
Reinsurance recoverable on unpaid losses and loss adjustment expenses January 1		173,267		196,590		196,080
Net unpaid loss and loss adjustment expenses, January 1		506,934		453,051		420,364
Incurred related to:
Current year		162,660		155,998		119,939
Prior years		9,038		13,369		356
Total incurred		171,698		169,367		120,295
Paid related to:
Current year		26,822		22,454		13,302
Prior years		112,214		93,030		74,306
Total paid		139,036		115,484		87,608
Net unpaid loss and loss adjustment expenses, December 31		539,596		506,934		453,051
Reinsurance recoverable on unpaid loss and loss adjustment expenses, December 31		185,648		173,267		196,590
Unpaid loss and loss adjustment expenses, December 31	$	725,244	$	680,201	$	649,641

Summary of net prior year reserve development

	Year Ended December 31,
	2012			2011			2010
	(dollars in thousands)
(Favorable) Unfavorable
E & S Lines	$	(1,780	)	$	(10,209	)	$	(2,397	)
Alternative Risk Transfer		2,946			12,120			2,666
Assumed Re		8,096			9,437			1,448
Runoff		(224	)		2,021			(1,361	)
Total	$	9,038		$	13,369		$	356