|
Investments - Schedule of Amortized Cost and Fair Value of Securities (Details) (USD $)
In Thousands, unless otherwise specified
|
Mar. 31, 2013
|
Dec. 31, 2012
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
$ 2,529,651 |
|
$ 2,538,661 |
|
| Securities, Gross Unrealized Gains |
270,632 |
|
280,695 |
|
| Securities, Gross Unrealized Losses |
10,550 |
|
11,154 |
|
| Fair value |
2,789,733 |
|
2,808,202 |
|
|
U.S. Treasury securities and obligations of U.S. Government
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
119,721 |
|
121,774 |
|
| Securities, Gross Unrealized Gains |
13,027 |
|
14,302 |
|
| Securities, Gross Unrealized Losses |
22 |
|
25 |
|
| Fair value |
132,726 |
|
136,051 |
|
|
Federal agencies
|
|
|
|
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| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
21,070 |
[1] |
22,070 |
[1] |
| Securities, Gross Unrealized Gains |
3,901 |
[1] |
3,999 |
[1] |
| Securities, Gross Unrealized Losses |
0 |
[1] |
0 |
[1] |
| Fair value |
24,971 |
[1] |
26,069 |
[1] |
|
Federal agency issued residential mortgage-backed securities
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
75,871 |
[1] |
83,608 |
[1] |
| Securities, Gross Unrealized Gains |
8,004 |
[1] |
8,381 |
[1] |
| Securities, Gross Unrealized Losses |
2 |
[1] |
4 |
[1] |
| Fair value |
83,873 |
[1] |
91,985 |
[1] |
|
US treasury securities, subtotal
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
216,662 |
|
227,452 |
|
| Securities, Gross Unrealized Gains |
24,932 |
|
26,682 |
|
| Securities, Gross Unrealized Losses |
24 |
|
29 |
|
| Fair value |
241,570 |
|
254,105 |
|
|
Industrial
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
496,432 |
|
494,615 |
|
| Securities, Gross Unrealized Gains |
49,536 |
|
51,645 |
|
| Securities, Gross Unrealized Losses |
522 |
|
377 |
|
| Fair value |
545,446 |
|
545,883 |
|
|
Energy
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
193,718 |
|
188,790 |
|
| Securities, Gross Unrealized Gains |
23,013 |
|
22,473 |
|
| Securities, Gross Unrealized Losses |
358 |
|
14 |
|
| Fair value |
216,373 |
|
211,249 |
|
|
Communications and technology
|
|
|
|
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| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
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| Securities, Amortized Cost |
197,179 |
|
198,332 |
|
| Securities, Gross Unrealized Gains |
22,178 |
|
23,283 |
|
| Securities, Gross Unrealized Losses |
61 |
|
15 |
|
| Fair value |
219,296 |
|
221,600 |
|
|
Financial
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
281,194 |
|
287,854 |
|
| Securities, Gross Unrealized Gains |
27,824 |
|
27,487 |
|
| Securities, Gross Unrealized Losses |
1,202 |
|
1,467 |
|
| Fair value |
307,816 |
|
313,874 |
|
|
Consumer
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
487,609 |
|
476,913 |
|
| Securities, Gross Unrealized Gains |
45,810 |
|
49,395 |
|
| Securities, Gross Unrealized Losses |
216 |
|
70 |
|
| Fair value |
533,203 |
|
526,238 |
|
|
Public utilities
|
|
|
|
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| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
244,594 |
|
246,389 |
|
| Securities, Gross Unrealized Gains |
38,383 |
|
39,840 |
|
| Securities, Gross Unrealized Losses |
162 |
|
102 |
|
| Fair value |
282,815 |
|
286,127 |
|
|
Corporate obligations, subtotal
|
|
|
|
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| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
1,900,726 |
|
1,892,893 |
|
| Securities, Gross Unrealized Gains |
206,744 |
|
214,123 |
|
| Securities, Gross Unrealized Losses |
2,521 |
|
2,045 |
|
| Fair value |
2,104,949 |
|
2,104,971 |
|
|
Corporate private-labeled residential mortgage-backed securities
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
138,132 |
|
144,852 |
|
| Securities, Gross Unrealized Gains |
4,531 |
|
4,033 |
|
| Securities, Gross Unrealized Losses |
619 |
|
754 |
|
| Fair value |
142,044 |
|
148,131 |
|
|
Municipal securities
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|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
140,232 |
|
140,843 |
|
| Securities, Gross Unrealized Gains |
26,696 |
|
27,141 |
|
| Securities, Gross Unrealized Losses |
0 |
|
0 |
|
| Fair value |
166,928 |
|
167,984 |
|
|
Other
|
|
|
|
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| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
98,864 |
|
106,442 |
|
| Securities, Gross Unrealized Gains |
5,861 |
|
6,494 |
|
| Securities, Gross Unrealized Losses |
7,281 |
|
8,192 |
|
| Fair value |
97,444 |
|
104,744 |
|
|
Redeemable preferred stocks
|
|
|
|
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| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
11,117 |
|
7,984 |
|
| Securities, Gross Unrealized Gains |
258 |
|
266 |
|
| Securities, Gross Unrealized Losses |
47 |
|
44 |
|
| Fair value |
11,328 |
|
8,206 |
|
|
Fixed maturity securities
|
|
|
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
2,505,733 |
|
2,520,466 |
|
| Securities, Gross Unrealized Gains |
269,022 |
|
278,739 |
|
| Securities, Gross Unrealized Losses |
10,492 |
|
11,064 |
|
| Fair value |
2,764,263 |
|
2,788,141 |
|
|
Equity securities
|
|
|
|
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| Schedule of Available-for-sale Securities [Line Items] |
|
|
|
|
| Securities, Amortized Cost |
23,918 |
|
18,195 |
|
| Securities, Gross Unrealized Gains |
1,610 |
|
1,956 |
|
| Securities, Gross Unrealized Losses |
58 |
|
90 |
|
| Fair value |
$ 25,470 |
|
$ 20,061 |
|
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