Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2016 |
Jun. 30, 2015 |
|
| Statement Of Income And Comprehensive Income [Abstract] | ||||
| Net income | $ 102,451 | $ 93,579 | $ 155,123 | $ 131,375 |
| Other comprehensive income (loss), net of tax: | ||||
| Unrealized gains (losses) on securities | 17,681 | (28,506) | 49,508 | (8,432) |
| Foreign currency translation adjustment | (5,579) | 4,866 | 6,525 | (13,794) |
| Pension benefit adjustment | 3,621 | 4,601 | 7,217 | 9,202 |
| Total other comprehensive income (loss), net of tax | 15,723 | (19,039) | 63,250 | (13,024) |
| Comprehensive income | 118,174 | 74,540 | 218,373 | 118,351 |
| Less: Comprehensive income attributable to noncontrolling interests | 272 | 227 | 489 | 390 |
| Comprehensive income attributable to the Company | $ 117,902 | $ 74,313 | $ 217,884 | $ 117,961 |