SCHEDULE VI-SUPPLEMENTARY INFORMATION CONCERNING PROPERTY-CASUALTY INSURANCE OPERATIONS (Details) - 10K (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Claims and claim adjustment expenses incurred related to:
Current accident year	$ 361,451	$ 332,282	$ 336,228
Prior accident years	(64,842)	(72,481)	(64,583)
Amortization of deferred acquisition costs	229,283	210,651	196,362
Consolidated property-casualty insurance operations
SUPPLEMENTARY INFORMATION CONCERNING PROPERTY-CASUALTY INSURANCE OPERATIONS
Deferred policy acquisition costs	65,123	61,508	52,344
Claims and claim adjustment expense reserves	1,121,040	1,129,433	1,158,483
Unearned premiums, gross	401,412	392,081	369,346
Net premiums earned	687,375	630,802	576,571
Net investment income	55,608	52,763	58,831
Claims and claim adjustment expenses incurred related to:
Current accident year	361,451	332,282	336,228
Prior accident years	(64,842)	(72,481)	(64,583)
Amortization of deferred acquisition costs	229,283	210,651	196,362
Paid claims and claims adjustment expenses	285,184	283,891	269,955
Net premiums written	$ 703,152	$ 666,322	$ 593,086