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INVESTMENTS (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Available-for-sale securities [Abstract]      
Amortized cost $ 2,721,791,000   $ 2,644,753,000
Unrealized gain 90,344,000   111,913,000
Unrealized loss (2,217,000)   (947,000)
Fair value 2,809,918,000   2,755,719,000
Fair value of equity method investments 24,118,000 [1]   24,605,000 [1]
Fair value of investments 2,834,036,000   2,780,324,000
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months 375,565,000   204,949,000
12 months or more 214,000   1,738,000
Total 375,779,000   206,687,000
Continuous unrealized loss position, aggregate losses [Abstract]      
Less than 12 months (2,213,000)   (944,000)
12 months or more (4,000)   (3,000)
Total (2,217,000)   (947,000)
Available-for-sale securities, debt maturities, amortized cost basis [Abstract]      
Within 1 year 468,436,000   362,116,000
1 to 5 years 725,945,000   798,143,000
5 to 10 years 711,930,000   652,941,000
Over 10 years 815,480,000   831,553,000
Total 2,721,791,000   2,644,753,000
Available-for-sale securities, debt maturities, fair value [Abstract]      
Within 1 year 470,166,000   363,559,000
1 to 5 years 747,376,000   822,448,000
5 to 10 years 745,058,000   693,504,000
Over 10 years 847,318,000   876,208,000
Available-for-sale securities, debt maturities, fair value 2,809,918,000   2,755,719,000
Gross investment gains on sale of investments 12,800,000 4,300,000  
Gross investment losses on sale of investments 300,000 0  
State and municipal bonds [Member]
     
Available-for-sale securities [Abstract]      
Amortized cost 1,120,913,000   1,176,016,000
Unrealized gain 66,748,000   78,272,000
Unrealized loss (726,000)   (499,000)
Fair value 1,186,935,000   1,253,789,000
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months 110,627,000   61,342,000
12 months or more 102,000   0
Total 110,729,000   61,342,000
Continuous unrealized loss position, aggregate losses [Abstract]      
Less than 12 months (725,000)   (499,000)
12 months or more (1,000)   0
Total (726,000)   (499,000)
Available-for-sale securities, debt maturities, fair value [Abstract]      
Available-for-sale securities, debt maturities, fair value 1,186,935,000   1,253,789,000
U.S. Treasury securities [Member]
     
Available-for-sale securities [Abstract]      
Amortized cost 114,448,000   78,264,000
Unrealized gain 577,000   669,000
Unrealized loss (1,000)   (2,000)
Fair value 115,024,000   78,931,000
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months 1,774,000   2,458,000
12 months or more 0   1,065,000
Total 1,774,000   3,523,000
Continuous unrealized loss position, aggregate losses [Abstract]      
Less than 12 months (1,000)   (1,000)
12 months or more 0   (1,000)
Total (1,000)   (2,000)
Available-for-sale securities, debt maturities, fair value [Abstract]      
Available-for-sale securities, debt maturities, fair value 115,024,000   78,931,000
Government-sponsored enterprise securities [Member]
     
Available-for-sale securities [Abstract]      
Amortized cost 79,039,000   72,394,000
Unrealized gain 248,000   1,139,000
Unrealized loss (2,000)   (1,000)
Fair value 79,285,000   73,532,000
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months 11,786,000   15,714,000
12 months or more 0   0
Total 11,786,000   15,714,000
Continuous unrealized loss position, aggregate losses [Abstract]      
Less than 12 months (2,000)   (1,000)
12 months or more 0   0
Total (2,000)   (1,000)
Available-for-sale securities, debt maturities, fair value [Abstract]      
Available-for-sale securities, debt maturities, fair value 79,285,000   73,532,000
Residential mortgage-backed securities [Member]
     
Available-for-sale securities [Abstract]      
Amortized cost 328,940,000 [2]   302,012,000 [2]
Unrealized gain 9,051,000 [2]   10,703,000 [2]
Unrealized loss (793,000) [2]   (74,000) [2]
Fair value 337,198,000 [2]   312,641,000 [2]
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months 120,987,000   23,861,000
12 months or more 60,000   59,000
Total 121,047,000   23,920,000
Continuous unrealized loss position, aggregate losses [Abstract]      
Less than 12 months (792,000)   (73,000)
12 months or more (1,000)   (1,000)
Total (793,000)   (74,000)
Available-for-sale securities, debt maturities, fair value [Abstract]      
Available-for-sale securities, debt maturities, fair value 337,198,000 [2]   312,641,000 [2]
Commercial mortgage-backed securities [Member]
     
Available-for-sale securities [Abstract]      
Amortized cost 33,938,000   21,416,000
Unrealized gain 80,000   193,000
Unrealized loss (126,000)   (19,000)
Fair value 33,892,000   21,590,000
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months 21,456,000   7,701,000
12 months or more 0   0
Total 21,456,000   7,701,000
Continuous unrealized loss position, aggregate losses [Abstract]      
Less than 12 months (126,000)   (19,000)
12 months or more 0   0
Total (126,000)   (19,000)
Available-for-sale securities, debt maturities, fair value [Abstract]      
Available-for-sale securities, debt maturities, fair value 33,892,000   21,590,000
Asset Backed Securities [Member]
     
Available-for-sale securities [Abstract]      
Amortized cost 22,226,000 [3]   23,421,000 [3]
Unrealized gain 356,000 [3]   211,000 [3]
Unrealized loss (10,000) [3]   (6,000) [3]
Fair value 22,572,000 [3]   23,626,000 [3]
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months 13,988,000   14,492,000
12 months or more 0   0
Total 13,988,000   14,492,000
Continuous unrealized loss position, aggregate losses [Abstract]      
Less than 12 months (10,000)   (6,000)
12 months or more 0   0
Total (10,000)   (6,000)
Available-for-sale securities, debt maturities, fair value [Abstract]      
Available-for-sale securities, debt maturities, fair value 22,572,000 [3]   23,626,000 [3]
Corporate debt and other securities [Member]
     
Available-for-sale securities [Abstract]      
Amortized cost 1,022,287,000   971,230,000
Unrealized gain 13,284,000   20,726,000
Unrealized loss (559,000)   (346,000)
Fair value 1,035,012,000   991,610,000
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months 94,947,000   79,381,000
12 months or more 52,000   614,000
Total 94,999,000   79,995,000
Continuous unrealized loss position, aggregate losses [Abstract]      
Less than 12 months (557,000)   (345,000)
12 months or more (2,000)   (1,000)
Total (559,000)   (346,000)
Available-for-sale securities, debt maturities, fair value [Abstract]      
Available-for-sale securities, debt maturities, fair value $ 1,035,012,000   $ 991,610,000
[1] Includes investments in entities accounted for under the equity method of accounting and therefore are presented at their carrying value.
[2] Includes Agency pass-through securities, with the timely payment of principal and interest guaranteed.
[3] Includes auto loans, credit card debt, and rate reduction bonds.