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Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Document Period End Date Mar. 31, 2018    
Insurance Commissions $ 349,490    
Investment Income, Nonoperating 601 $ 243  
Other Income 522 20,271  
Fees and Commissions, Other 112,368    
Incentive Commission 23,816    
Profit-Sharing Contingent Commission Revenue 11,684    
Guaranteed Supplemental Commission 2,980    
Revenues 501,461 465,080  
Contract with Customer, Asset and Liability [Table Text Block] 222,544   $ 210,323
Contract with Customer, Liability 54,881   $ 51,236
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Insurance Commissions 126    
Investment Income, Nonoperating 413    
Other Income 58    
Fees and Commissions, Other (236)    
Incentive Commission 9    
Profit-Sharing Contingent Commission Revenue 0    
Guaranteed Supplemental Commission 0    
Segment Reconciling Items [Member]      
Segment Reporting Information [Line Items]      
Investment Income, Nonoperating 413 87  
Revenues 370 20,037  
Retail [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Insurance Commissions 222,329    
Investment Income, Nonoperating 1 2  
Other Income 205    
Fees and Commissions, Other 23,655    
Incentive Commission 23,560    
Profit-Sharing Contingent Commission Revenue 6,130    
Guaranteed Supplemental Commission 2,522    
Revenues 278,402 239,287  
National Programs [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Insurance Commissions 74,610    
Investment Income, Nonoperating 114 74  
Other Income 29    
Fees and Commissions, Other 33,685    
Incentive Commission 40    
Profit-Sharing Contingent Commission Revenue 3,982    
Guaranteed Supplemental Commission 15    
Revenues 112,475 101,183  
Wholesale Brokerage [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Insurance Commissions 52,425    
Investment Income, Nonoperating 0 0  
Other Income 230    
Fees and Commissions, Other 11,271    
Incentive Commission 207    
Profit-Sharing Contingent Commission Revenue 1,572    
Guaranteed Supplemental Commission 443    
Revenues 66,148 65,247  
Services [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Insurance Commissions 0    
Investment Income, Nonoperating 73 80  
Other Income 0    
Fees and Commissions, Other 43,993    
Incentive Commission 0    
Profit-Sharing Contingent Commission Revenue 0    
Guaranteed Supplemental Commission 0    
Revenues $ 44,066 $ 39,326