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Investments (Unrealized Gains on Investments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net unrealized gains $ 386,393 $ 215,688 $ 2,391  
Deferred income tax expense (81,142) (45,294) (502)  
Net unrealized gains, net of deferred income tax 305,251 170,394 1,889  
Total stockholders’ equity 2,738,889 2,194,936 1,791,802  
Increase (decrease) in net unrealized gains in OCI, net of deferred income tax 134,857 168,505 (65,881)  
Accounting Standards Update 2016-01 [Member]        
Total stockholders’ equity [1] 0 0 (30,726)  
Available-for-sale Securities [Member]        
Net unrealized gains 386,380 215,634 2,302  
Total HTM Securities [Member]        
Net unrealized gains 7 31 89  
Short-term Investments [Member]        
Net unrealized gains 6 23 0  
Investments [Member] | Accounting Standards Update 2018-02 [Member]        
Total stockholders’ equity [1] 0 0 17,920  
Retained Earnings [Member]        
Total stockholders’ equity $ 2,271,537 2,080,529 1,858,414 $ 1,698,613
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]        
Total stockholders’ equity   0 0 30,726
Equity Impact on Cumulative Effect Adjustment       30,700
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member]        
Total stockholders’ equity   0 $ 0 $ (5,707)
Retained Earnings [Member] | Investments [Member] | Accounting Standards Update 2018-02 [Member]        
Total stockholders’ equity   $ 17,900    
[1] Upon adoption of ASU 2016-01, we recognized a $30.7 million cumulative-effect adjustment to the opening balance of AOCI, which represents the after-tax net unrealized gain on our equity portfolio as of December 31, 2018. Additionally, upon adoption of ASU 2018-02, we recognized a one-time reclassification from AOCI to retained earnings for $17.9 million representing the stranded tax assets related to our investment portfolio that were created in AOCI from the enactment of the Tax Cuts and Jobs Act of 2017.