SCHEDULE VI-SUPPLEMENTARY INFORMATION CONCERNING PROPERTY-CASUALTY INSURANCE OPERATIONS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Claims and claim adjustment expenses incurred related to:
Current accident year	$ 332,282	$ 336,228	$ 310,145
Prior accident years	(72,481)	(64,583)	(110,061)
Amortization of deferred acquisition costs	210,651	196,362	183,868
Consolidated property-casualty insurance operations
SUPPLEMENTARY INFORMATION CONCERNING PROPERTY-CASUALTY INSURANCE OPERATIONS
Deferred policy acquisition costs	61,508	52,344	52,105
Claims and claim adjustment expense reserves	1,129,433	1,158,483	1,150,714
Unearned premiums, gross	392,081	369,346	341,267
Net premiums earned	630,802	576,571	538,452
Net investment income	52,763	58,831	63,681
Claims and claim adjustment expenses incurred related to:
Current accident year	332,282	336,228	310,145
Prior accident years	(72,481)	(64,583)	(110,061)
Amortization of deferred acquisition costs	210,651	196,362	183,868
Paid claims and claims adjustment expenses	283,891	269,955	276,461
Net premiums written	$ 666,322	$ 593,086	$ 549,638