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Supplementary Data on Cash Flows (Tables) | 12 Months Ended
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Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract] |
Reconciliation of net income to net cash provided by operating activities | A reconciliation of net income to net cash provided by operating activities as presented in the Consolidated Statements of Cash Flows is as follows:
($ in thousands) |  | Years Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Cash flows from operating activities |  |  |  |  |  |  |  |  |
Net income |  | $ | 169,459 |  |  | $ | 83,765 |  |  | $ | 93,482 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |
Net realized investment (gains) losses |  | 3,406 |  |  | (4,123 | ) |  | (12,713 | )
Increase in accrued investment income |  | (3,404 | ) |  | (2,208 | ) |  | (2,566 | )
Increase (decrease) in accrued expenses |  | (2,240 | ) |  | 4,378 |  |  | (5,798 | )
Depreciation and amortization |  | 6,615 |  |  | 6,896 |  |  | 7,734 |
Increase in insurance liabilities |  | 154,061 |  |  | 176,315 |  |  | 145,313 |
Increase in premium receivables |  | (12,917 | ) |  | (11,496 | ) |  | (8,641 | )
Increase in deferred policy acquisition costs |  | (7,967 | ) |  | (15,859 | ) |  | (8,981 | )
(Increase) decrease in reinsurance recoverables |  | 11 |  |  | (481 | ) |  | (748 | )
(Decrease) increase in income tax liabilities |  | (74,487 | ) |  | (1,293 | ) |  | 8,935 |
Debt retirement costs |  | — |  |  | — |  |  | 2,338 |
Other |  | 24,049 |  |  | (24,461 | ) |  | (10,641 | )
Total adjustments |  | 87,127 |  |  | 127,668 |  |  | 114,232 |
Net cash provided by operating activities |  | $ | 256,586 |  |  | $ | 211,433 |  |  | $ | 207,714 |

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