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Significant Accounting Policies (Details 2) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Impact of adoption on our Statement of Financial Position            
Deferred tax asset $ 37,660   $ 37,660   $ 29,578  
Contract liability 51,989   51,989   48,514  
Retained earnings 2,211,013   2,211,013   2,102,527 $ 2,140,853
Impact of adoption on our Statement of Operations            
Operating revenue 612,126 $ 442,492 1,805,744 $ 1,290,372    
Operating expenses 515,431 361,253 1,536,159 1,058,745    
Calculated under revenue guidance in effect before ASC 606 [Member]            
Impact of adoption on our Statement of Financial Position            
Deferred tax asset 26,742   26,742     19,390
Retained earnings 2,252,084   2,252,084     $ 2,140,853
Difference between revenue guidance in effect before and after ASC 606 [Member] | Accounting Standards Update 2014-09 [Member]            
Impact of adoption on our Statement of Financial Position            
Deferred tax asset 10,918   10,918   10,188  
Contract liability 51,989   51,989   48,514  
Retained earnings (41,071)   (41,071)   $ (38,326)  
Management fee revenue, policy issuance and renewal services [Member]            
Impact of adoption on our Statement of Operations            
Management fee revenue, gross 451,070   1,315,202      
Less: change in allowance for management fee returned on cancelled policies 291   (3,291)      
Operating revenue 451,361 435,214 1,311,911 1,268,591    
Operating expenses 375,259 $ 361,253 1,103,517 $ 1,058,745    
Management fee revenue, policy issuance and renewal services [Member] | Calculated under revenue guidance in effect before ASC 606 [Member]            
Impact of adoption on our Statement of Operations            
Management fee revenue, gross 465,982   1,358,680      
Less: change in allowance for management fee returned on cancelled policies 300   (3,400)      
Operating revenue 466,282   1,355,280      
Management fee revenue, policy issuance and renewal services [Member] | Difference between revenue guidance in effect before and after ASC 606 [Member] | Accounting Standards Update 2014-09 [Member]            
Impact of adoption on our Statement of Operations            
Management fee revenue, gross (14,912)   (43,478)      
Less: change in allowance for management fee returned on cancelled policies (9)   109      
Operating revenue (14,921)   (43,369)      
Management fee revenue, administrative services [Member]            
Impact of adoption on our Statement of Operations            
Management fee revenue, gross 13,538   39,939      
Less: change in allowance for management fee returned on cancelled policies (17)   (45)      
Operating revenue 13,521   39,894      
Management fee revenue, administrative services [Member] | Difference between revenue guidance in effect before and after ASC 606 [Member] | Accounting Standards Update 2014-09 [Member]            
Impact of adoption on our Statement of Operations            
Management fee revenue, gross 13,538   39,939      
Less: change in allowance for management fee returned on cancelled policies (17)   (45)      
Operating revenue 13,521   39,894      
Administrative services reimbursements [Member]            
Impact of adoption on our Statement of Operations            
Operating revenue 140,172   432,642      
Operating expenses 140,172   432,642      
Administrative services reimbursements [Member] | Difference between revenue guidance in effect before and after ASC 606 [Member] | Accounting Standards Update 2014-09 [Member]            
Impact of adoption on our Statement of Operations            
Operating revenue 140,172   432,642      
Operating expenses 140,172   432,642      
Administrative services [Member]            
Impact of adoption on our Statement of Operations            
Operating revenue 153,693   472,536      
Administrative services [Member] | Difference between revenue guidance in effect before and after ASC 606 [Member] | Accounting Standards Update 2014-09 [Member]            
Impact of adoption on our Statement of Operations            
Operating revenue $ 153,693   $ 472,536