Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Statement of Comprehensive Income [Abstract] | ||
| Net earnings | $ 20,083 | $ 10,510 |
| Other comprehensive income before tax: | ||
| Net change in post-retirement benefit liability | (2) | (13) |
| Unrealized gains on investments(1): | ||
| Unrealized holding (losses) gains arising during the period | (18,344) | 10,664 |
| Less: Reclassification adjustments for losses (gains) included in net earnings | 2,106 | (509) |
| Unrealized (losses) gains on investments, net | (16,238) | 10,155 |
| Other comprehensive (loss) income, before tax | (16,240) | 10,143 |
| Income tax benefit (expense) related to components of other comprehensive income | 3,410 | (3,550) |
| Other comprehensive (loss) income, net of tax | (12,829) | 6,593 |
| Comprehensive income | $ 7,254 | $ 17,102 |