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SCHEDULE II - CONDENSED FINANCIAL INFORMATION OF REGISTRANT (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income (amortized cost, 2016 – $247,396; 2015 – $385,281) |  |  |  |  |  |  |  |  |  |  |  | $ 4,685,222 | $ 4,657,561 |
Cash and cash equivalents | $ 155,410 |  |  | $ 181,120 | $ 181,120 |  |  | $ 197,882 | $ 181,120 | $ 197,882 | $ 332,692 | 155,410 | 181,120 | $ 197,882
Accrued investment income |  |  |  |  |  |  |  |  |  |  |  | 44,073 | 40,224 |
Other assets |  |  |  |  |  |  |  |  |  |  |  | 73,345 | 80,102 |
Total assets |  |  |  |  |  |  |  |  |  |  |  | 5,734,529 | 5,868,343 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  | 417,406 | 0 |
Convertible senior notes |  |  |  |  |  |  |  |  |  |  |  | 349,461 | 822,301 |
Convertible junior subordinated debentures |  |  |  |  |  |  |  |  |  |  |  | 256,872 | 389,522 |
Total liabilities |  |  |  |  |  |  |  |  |  |  |  | 3,185,687 | 3,632,203 |
Shareholders’ equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock (one dollar par value, shares authorized 1,000,000; shares issued 2016 - 359,400; 2015 - 340,097; outstanding 2016 - 340,663; 2015 - 339,657) |  |  |  |  |  |  |  |  |  |  |  | 359,400 | 340,097 |
Paid-in capital |  |  |  |  |  |  |  |  |  |  |  | 1,782,337 | 1,670,238 |
Treasury stock (shares at cost 2016 – 18,737; 2015 – 440) |  |  |  |  |  |  |  |  |  |  |  | (150,359) | (3,362) |
Accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |  |  |  |  | (75,100) | (60,880) |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  | 632,564 | 290,047 |
Total shareholders' equity |  |  |  |  |  |  |  |  |  |  |  | 2,548,842 | 2,236,140 | 1,036,903
Total liabilities and shareholders' equity |  |  |  |  |  |  |  |  |  |  |  | 5,734,529 | 5,868,343 |
Parenthetical information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income, amortized cost |  |  |  |  |  |  |  |  |  |  |  | $ 4,717,211 | $ 4,684,148 |
Common stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 1 | $ 1 |
Common stock, shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 | 1,000,000,000 |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  | 359,400,000 | 340,097,000 |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 340,663,000 | 339,657,000 |
Treasury stock, shares at cost (in shares) |  |  |  |  |  |  |  |  |  |  |  | 18,737,000 | 440,000 |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment income, net of expenses | 28,094 | $ 27,515 | $ 27,248 | 27,809 | 27,926 | $ 25,939 | $ 25,756 | 24,120 | 110,666 | 103,741 | 87,647 |  |  |
Realized (losses) gains | (52) | 5,092 | 836 | 3,056 | 1,228 | 640 | 166 | 26,327 | 8,932 | 28,361 | 1,357 |  |  |
Total revenues |  |  |  |  |  |  |  |  | 1,062,483 | 1,041,288 | 942,634 |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 56,672 | 68,932 | 69,648 |  |  |
Loss on debt extinguishment | 0 | 75,223 | 1,868 | 13,440 | 507 | 0 | 0 | 0 | 90,531 | 507 | 837 |  |  |
Total losses and expenses |  |  |  |  |  |  |  |  | 547,769 | 553,601 | 687,911 |  |  |
Income before tax |  |  |  |  |  |  |  |  | 514,714 | 487,687 | 254,723 |  |  |
Provision for (benefit from) income taxes | 54,551 | 27,131 | 56,018 | 34,497 | 6,584 | (695,604) | 1,322 | 3,385 | 172,197 | (684,313) | 2,774 |  |  |
Net income | 107,487 | 56,618 | 109,221 | 69,191 | 102,418 | 822,852 | 113,654 | 133,076 | 342,517 | 1,172,000 | 251,949 |  |  |
Other comprehensive (loss) income, net of tax |  |  |  |  |  |  |  |  | (14,220) | 20,461 | 36,385 |  |  |
Comprehensive income |  |  |  |  |  |  |  |  | 328,297 | 1,192,461 | 288,334 |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 107,487 | 56,618 | 109,221 | 69,191 | 102,418 | 822,852 | 113,654 | 133,076 | 342,517 | 1,172,000 | 251,949 |  |  |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Federal |  |  |  |  |  |  |  |  | 160,657 | (686,652) | 1 |  |  |
Loss on debt extinguishment | 0 | $ 75,223 | $ 1,868 | 13,440 | 507 | $ 0 | $ 0 | 0 | 90,531 | 507 | 837 |  |  |
Change in certain assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued investment income |  |  |  |  |  |  |  |  | (3,849) | (9,706) | 1,142 |  |  |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of fixed income |  |  |  |  |  |  |  |  | (1,360,386) | (2,462,844) | (1,979,917) |  |  |
Sale of fixed income |  |  |  |  |  |  |  |  | 728,042 | 1,796,153 | 1,147,624 |  |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 573,094 | 0 | 0 |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  | 0 | (61,953) | (20,772) |  |  |
Repurchase of convertible senior notes |  |  |  |  |  |  |  |  | (363,778) | (11,152) | 0 |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | (147,127) | 0 | 0 |  |  |
Excess tax benefits related to share-based compensation |  |  |  |  |  |  |  |  | 67 | 2,117 | 0 |  |  |
Net decrease in cash and cash equivalents |  |  |  |  |  |  |  |  | (25,710) | (16,762) | (134,810) |  |  |
Cash and cash equivalents at beginning of year |  |  |  | 181,120 |  |  |  | 197,882 | 181,120 | 197,882 | 332,692 |  |  |
Cash and cash equivalents at end of year | 155,410 |  |  |  | 181,120 |  |  |  | 155,410 | 181,120 | 197,882 |  |  |
Parent Company |  |  |  |  |  |  |  |  |  |  |  |  |  |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income (amortized cost, 2016 – $247,396; 2015 – $385,281) |  |  |  |  |  |  |  |  |  |  |  | $ 245,435 | $ 382,565 |
Cash and cash equivalents | 37,666 |  |  | 19,417 | 19,417 |  |  | 10,507 | 19,417 | 10,507 | 20,725 | 37,666 | 19,417 | $ 10,507
Investment in subsidiaries, at equity in net assets |  |  |  |  |  |  |  |  |  |  |  | 3,150,671 | 2,903,944 |
Accounts receivable - affiliates |  |  |  |  |  |  |  |  |  |  |  | 780 | 938 |
Income taxes - current and deferred |  |  |  |  |  |  |  |  |  |  |  | 289,703 | 151,318 |
Accrued investment income |  |  |  |  |  |  |  |  |  |  |  | 1,749 | 3,700 |
Other assets |  |  |  |  |  |  |  |  |  |  |  | 80 | 123 |
Total assets |  |  |  |  |  |  |  |  |  |  |  | 3,726,084 | 3,462,005 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  | 417,406 | 0 |
Convertible senior notes |  |  |  |  |  |  |  |  |  |  |  | 349,461 | 822,301 |
Convertible junior subordinated debentures |  |  |  |  |  |  |  |  |  |  |  | 389,522 | 389,522 |
Accrued interest |  |  |  |  |  |  |  |  |  |  |  | 20,853 | 14,042 |
Total liabilities |  |  |  |  |  |  |  |  |  |  |  | 1,177,242 | 1,225,865 |
Shareholders’ equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock (one dollar par value, shares authorized 1,000,000; shares issued 2016 - 359,400; 2015 - 340,097; outstanding 2016 - 340,663; 2015 - 339,657) |  |  |  |  |  |  |  |  |  |  |  | 359,400 | 340,097 |
Paid-in capital |  |  |  |  |  |  |  |  |  |  |  | 1,782,337 | 1,670,238 |
Treasury stock (shares at cost 2016 – 18,737; 2015 – 440) |  |  |  |  |  |  |  |  |  |  |  | (150,359) | (3,362) |
Accumulated other comprehensive loss, net of tax |  |  |  |  |  |  |  |  |  |  |  | (75,100) | (60,880) |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  | 632,564 | 290,047 |
Total shareholders' equity |  |  |  |  |  |  |  |  |  |  |  | 2,548,842 | 2,236,140 |
Total liabilities and shareholders' equity |  |  |  |  |  |  |  |  |  |  |  | 3,726,084 | 3,462,005 |
Parenthetical information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income, amortized cost |  |  |  |  |  |  |  |  |  |  |  | $ 247,396 | $ 385,281 |
Common stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 1 | $ 1 |
Common stock, shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 | 1,000,000,000 |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  |  |  | 359,400,000 | 340,097,000 |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  | 340,663,000 | 339,657,000 |
Treasury stock, shares at cost (in shares) |  |  |  |  |  |  |  |  |  |  |  | 18,737,000 | 440,000 |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment income, net of expenses |  |  |  |  |  |  |  |  | 3,807 | 7,586 | 6,985 |  |  |
Realized (losses) gains |  |  |  |  |  |  |  |  | 646 | 357 | 395 |  |  |
Total revenues |  |  |  |  |  |  |  |  | 4,453 | 7,943 | 7,380 |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 1,409 | 582 | 546 |  |  |
Interest expense |  |  |  |  |  |  |  |  | 64,598 | 68,932 | 69,648 |  |  |
Loss on debt extinguishment |  |  |  |  |  |  |  |  | 82,234 | 507 | 837 |  |  |
Total losses and expenses |  |  |  |  |  |  |  |  | 148,241 | 70,021 | 71,031 |  |  |
Income before tax |  |  |  |  |  |  |  |  | (143,788) | (62,078) | (63,651) |  |  |
Provision for (benefit from) income taxes |  |  |  |  |  |  |  |  | (52,575) | (125,487) | 0 |  |  |
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | 433,730 | 1,108,591 | 315,600 |  |  |
Net income |  |  |  |  |  |  |  |  | 342,517 | 1,172,000 | 251,949 |  |  |
Other comprehensive (loss) income, net of tax |  |  |  |  |  |  |  |  | (14,220) | 20,461 | 36,385 |  |  |
Comprehensive income |  |  |  |  |  |  |  |  | 328,297 | 1,192,461 | 288,334 |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 342,517 | 1,172,000 | 251,949 |  |  |
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in net income of subsidiaries |  |  |  |  |  |  |  |  | (433,730) | (1,108,591) | (315,600) |  |  |
Dividends received from subsidiaries |  |  |  |  |  |  |  |  | 64,000 | 6,500 | 0 |  |  |
Deferred Federal |  |  |  |  |  |  |  |  | (55,988) | (125,532) | 0 |  |  |
Loss on debt extinguishment |  |  |  |  |  |  |  |  | 82,234 | 507 | 837 |  |  |
Other |  |  |  |  |  |  |  |  | 11,625 | 22,342 | 14,025 |  |  |
Change in certain assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable - affiliates |  |  |  |  |  |  |  |  | 158 | (626) | 68 |  |  |
Income taxes receivable |  |  |  |  |  |  |  |  | 3,602 | (8,308) | 480 |  |  |
Accrued investment income |  |  |  |  |  |  |  |  | 1,951 | (265) | 194 |  |  |
Accrued interest |  |  |  |  |  |  |  |  | 6,811 | (652) | (188) |  |  |
Net cash used in operating activities |  |  |  |  |  |  |  |  | 23,180 | (42,625) | (48,235) |  |  |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital distributions from subsidiaries |  |  |  |  |  |  |  |  | 51,987 | 32,000 | 0 |  |  |
Capital contributions to subsidiaries |  |  |  |  |  |  |  |  | (36,025) | 0 | 0 |  |  |
Purchase of fixed income |  |  |  |  |  |  |  |  | (194,751) | (295,010) | (553,538) |  |  |
Sale of fixed income |  |  |  |  |  |  |  |  | 330,142 | 386,385 | 613,322 |  |  |
Net cash provided by investing activities |  |  |  |  |  |  |  |  | 151,353 | 123,375 | 59,784 |  |  |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  | 416,967 | 0 | 0 |  |  |
Repayment of long-term debt |  |  |  |  |  |  |  |  | 0 | (61,953) | (21,767) |  |  |
Repurchase of convertible senior notes |  |  |  |  |  |  |  |  | (426,191) | (12,004) | 0 |  |  |
Repurchase of common stock |  |  |  |  |  |  |  |  | (147,127) | 0 | 0 |  |  |
Excess tax benefits related to share-based compensation |  |  |  |  |  |  |  |  | 67 | 2,117 | 0 |  |  |
Net cash used in financing activities |  |  |  |  |  |  |  |  | (156,284) | (71,840) | (21,767) |  |  |
Net decrease in cash and cash equivalents |  |  |  |  |  |  |  |  | 18,249 | 8,910 | (10,218) |  |  |
Cash and cash equivalents at beginning of year |  |  |  | $ 19,417 |  |  |  | $ 10,507 | 19,417 | 10,507 | 20,725 |  |  |
Cash and cash equivalents at end of year | $ 37,666 |  |  |  | $ 19,417 |  |  |  | $ 37,666 | $ 19,417 | $ 10,507 |  |  |

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