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Significant Accounting Policies (Details 2) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Impact of adoption on our Statement of Financial Position            
Deferred tax asset $ 31,527   $ 31,527   $ 29,578  
Contract liability 50,589   50,589   48,514  
Retained earnings 2,169,686   2,169,686   2,102,527 $ 2,140,853
Impact of adoption on our Statement of Operations            
Operating revenue 621,458 $ 448,564 1,193,618 $ 847,880    
Operating expenses 526,135 365,116 1,020,728 697,492    
Calculated under revenue guidance in effect before ASC 606 [Member]            
Impact of adoption on our Statement of Financial Position            
Deferred tax asset 20,903   20,903     19,390
Retained earnings 2,209,651   2,209,651     $ 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 10,624   10,624   10,188  
Contract liability 50,589   50,589   48,514  
Retained earnings (39,965)   (39,965)   $ (38,326)  
Management fee revenue, policy issuance and renewal services [Member]            
Impact of adoption on our Statement of Operations            
Management fee revenue, gross 456,896   864,132      
Less: change in allowance for management fee returned on cancelled policies (2,324)   (3,582)      
Operating revenue 454,572 441,319 860,550 833,377    
Operating expenses 379,628 $ 365,116 728,258 $ 697,492    
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 471,999   892,698      
Less: change in allowance for management fee returned on cancelled policies (2,400)   (3,700)      
Operating revenue 469,599   888,998      
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 (15,103)   (28,566)      
Less: change in allowance for management fee returned on cancelled policies 76   118      
Operating revenue (15,027)   (28,448)      
Management fee revenue, administrative services [Member]            
Impact of adoption on our Statement of Operations            
Management fee revenue, gross 13,313   26,401      
Less: change in allowance for management fee returned on cancelled policies (14)   (28)      
Operating revenue 13,299   26,373      
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 13,313   26,401      
Less: change in allowance for management fee returned on cancelled policies (14)   (28)      
Operating revenue 13,299   26,373      
Administrative services reimbursements [Member]            
Impact of adoption on our Statement of Operations            
Operating revenue 146,507   292,470      
Operating expenses 146,507   292,470      
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 146,507   292,470      
Operating expenses 146,507   292,470      
Administrative services [Member]            
Impact of adoption on our Statement of Operations            
Operating revenue 159,806   318,843      
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 $ 159,806   $ 318,843