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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
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