Investment in Securities, Realized Gains and Losses from Investments (Details)
$ in Thousands |
12 Months Ended |
|
Dec. 31, 2016
USD ($)
Investment
|
Dec. 31, 2015
USD ($)
Investment
|
Dec. 31, 2014
USD ($)
|
| Securities available for sale [Abstract] |
|
|
|
| Gross losses from other-than-temporary impairments |
$ (1,434)
|
$ (5,212)
|
$ (1,170)
|
| Net realized gains on securities available for sale |
17,379
|
18,941
|
16,806
|
| Gross gain from other investment |
0
|
0
|
1,425
|
| Total net realized investment gains on sale of securities |
17,379
|
18,941
|
18,231
|
| Recognized in accumulated other comprehensive income [Abstract] |
|
|
|
| Available-for-sale securities |
4,125
|
(44,706)
|
40,600
|
| Not recognized in the consolidated financial statements [Abstract] |
|
|
|
| Deferred tax asset (liability) on unrealized gains (losses) |
$ (1,085)
|
$ 5,717
|
(4,717)
|
| Number of individual investment in securities exceeding 10% of stockholders' equity | Investment |
0
|
0
|
|
| Fixed Maturities Securities [Member] |
|
|
|
| Securities available for sale [Abstract] |
|
|
|
| Gross gains from sales |
$ 3,086
|
$ 8,208
|
5,118
|
| Gross losses from sales |
(2,744)
|
(646)
|
(5,884)
|
| Gross losses from other-than-temporary impairments |
0
|
(4,267)
|
(1,170)
|
| Gross realized gains (losses) |
342
|
3,295
|
(1,936)
|
| Recognized in accumulated other comprehensive income [Abstract] |
|
|
|
| Available-for-sale securities |
1,953
|
(25,227)
|
46,220
|
| Not recognized in the consolidated financial statements [Abstract] |
|
|
|
| Held to maturity |
(19)
|
(24)
|
49
|
| Equity Securities [Member] |
|
|
|
| Securities available for sale [Abstract] |
|
|
|
| Gross gains from sales |
19,674
|
17,903
|
20,848
|
| Gross losses from sales |
(1,203)
|
(1,312)
|
(2,106)
|
| Gross losses from other-than-temporary impairments |
(1,434)
|
(945)
|
0
|
| Gross realized gains (losses) |
17,037
|
15,646
|
18,742
|
| Recognized in accumulated other comprehensive income [Abstract] |
|
|
|
| Available-for-sale securities |
$ 2,172
|
$ (19,479)
|
$ (5,620)
|