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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands | Total | Common stock [Member] | Additional paid-in capital [Member] | Retained earnings [Member] | Accumulated other comprehensive income (loss), net of tax [Member] | Treasury stock, at cost [Member]
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 |  | $ 65 | $ 464,246 | $ 1,231,177 | $ 286,960 | $ (480,875)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Options exercised |  | 0 |  |  |  |
Conversion of common stock units |  | 0 |  |  |  |
Conversion of restricted stock units |  | 1 |  |  |  |
Options exercised and conversion of common stock units and restricted stock units |  |  | 2,259 |  |  |
Share-based compensation expense |  |  | 4,147 |  |  |
Net income | $ 26,072 |  |  | 26,072 |  |
Dividends |  |  |  | (23,985) |  |
Change in net unrealized investment gains on fixed maturity securities | (159,540) |  |  |  | (159,540) |
Change in net funded status of benefit plans | 0 |  |  |  | 0 |
Cumulative effect of change in accounting principle | (15,041) |  |  | 15,041 | (15,041) |
Acquisition of shares |  |  |  |  |  | (86)
Ending balance at Jun. 30, 2018 | 1,350,441 | 66 | 470,652 | 1,248,305 | 112,379 | (480,961)
Beginning balance at Mar. 31, 2018 |  | 66 | 466,277 | 1,254,394 | 164,823 | (480,881)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Options exercised |  | 0 |  |  |  |
Conversion of common stock units |  | 0 |  |  |  |
Conversion of restricted stock units |  | 0 |  |  |  |
Options exercised and conversion of common stock units and restricted stock units |  |  | 2,384 |  |  |
Share-based compensation expense |  |  | 1,991 |  |  |
Net income | 5,917 |  |  | 5,917 |  |
Dividends |  |  |  | (12,006) |  |
Change in net unrealized investment gains on fixed maturity securities | (52,444) |  |  |  | (52,444) |
Change in net funded status of benefit plans | 0 |  |  |  | 0 |
Cumulative effect of change in accounting principle | 0 |  |  | 0 | 0 |
Acquisition of shares |  |  |  |  |  | (80)
Ending balance at Jun. 30, 2018 | 1,350,441 | 66 | 470,652 | 1,248,305 | 112,379 | (480,961)
Beginning balance at Dec. 31, 2018 | 1,290,550 | 66 | 475,109 | 1,216,582 | 84,756 | (485,963)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Options exercised |  | 0 |  |  |  |
Conversion of common stock units |  | 0 |  |  |  |
Conversion of restricted stock units |  | 0 |  |  |  |
Options exercised and conversion of common stock units and restricted stock units |  |  | (1,761) |  |  |
Share-based compensation expense |  |  | 3,005 |  |  |
Net income | 125,988 |  |  | 125,988 |  |
Dividends |  |  |  | (24,241) |  |
Change in net unrealized investment gains on fixed maturity securities | 106,136 |  |  |  | 106,136 |
Change in net funded status of benefit plans | 0 |  |  |  | 0 |
Cumulative effect of change in accounting principle | 0 |  |  | 0 | 0 |
Acquisition of shares |  |  |  |  |  | 0
Ending balance at Jun. 30, 2019 | 1,499,677 | 66 | 476,353 | 1,318,329 | 190,892 | (485,963)
Beginning balance at Mar. 31, 2019 |  | 66 | 474,336 | 1,236,621 | 198,654 | (485,963)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Options exercised |  | 0 |  |  |  |
Conversion of common stock units |  | 0 |  |  |  |
Conversion of restricted stock units |  | 0 |  |  |  |
Options exercised and conversion of common stock units and restricted stock units |  |  | 344 |  |  |
Share-based compensation expense |  |  | 1,673 |  |  |
Net income | 93,822 |  |  | 93,822 |  |
Dividends |  |  |  | (12,114) |  |
Change in net unrealized investment gains on fixed maturity securities | (7,762) |  |  |  | (7,762) |
Change in net funded status of benefit plans | 0 |  |  |  | 0 |
Cumulative effect of change in accounting principle | 0 |  |  | 0 | 0 |
Acquisition of shares |  |  |  |  |  | 0
Ending balance at Jun. 30, 2019 | $ 1,499,677 | $ 66 | $ 476,353 | $ 1,318,329 | $ 190,892 | $ (485,963)

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