SCHEDULE II-CONDENSED FINANCIAL INFORMATION OF REGISTRANT (PARENT COMPANY) (Details 2) - 10K (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
CONDENSED BALANCE SHEETS (Parenthetical)
Available-for-sale, amortized cost	$ 1,448,204	$ 1,431,049
Property and equipment, accumulated depreciation	34,365	41,491
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	66,032,929	65,912,638
Common stock, shares outstanding (in shares)	43,102,715	42,982,424
Treasury stock, shares (in shares)	22,930,214	22,930,214
PARENT COMPANY
CONDENSED BALANCE SHEETS (Parenthetical)
Available-for-sale, amortized cost	46,226	18,839
Property and equipment, accumulated depreciation	$ 528	$ 312
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	66,032,929	65,912,638
Common stock, shares outstanding (in shares)	43,102,715	42,982,424
Treasury stock, shares (in shares)	22,930,214	22,930,214