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Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies - Schedule of Cumulative Effect Adjustment of Balance Sheet (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Agent balances, due premiums and other receivables | $ 291,329 |  | $ 229,522
Other liabilities | 495,242 |  | 451,398
Income taxes | 182,140 |  | 177,468
Retained earnings | $ 1,409,104 |  | $ 1,375,090
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Agent balances, due premiums and other receivables |  | $ 45,730 |
Other liabilities |  | 14,400 |
Income taxes |  | 6,647 |
Retained earnings |  | $ 24,683 |

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