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Consolidated Statement of Stockholders' Equity - 3 months ended Mar. 31, 2018 - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2017 $ 1,225,965 $ 3,650 $ 376,868 $ (155,801) $ 981,380 $ 19,868
Beginning Balance (in shares) at Dec. 31, 2017 36,530 36,530   7,023    
Net Income $ 30,878       30,878  
Dividends Declared (2,069)       (2,069)  
Changes in Comprehensive Income:            
Change in Net Unrealized Loss on Available-For-Sale Investments (36,038)         (36,038)
Change in Net Non-Credit Other-Than- Temporary Impairment Losses (30)         (30)
Change in Foreign Currency Translation Gain 2,228         2,228
Other Comprehensive Income (Loss) (33,840)         (33,840)
Cumulative Effect of Adoption of ASU at January 1st, Net of Tax | ASU 2016-01         7,748 (7,748)
Cumulative Effect of Adoption of ASU at January 1st, Net of Tax | Accounting Standards Update 2018-02         (2,828) 2,828
Shares Issued [1] (4,968) $ 20 (4,988)      
Shares issued (in shares) [1]   203        
Share-Based Compensation 986   986      
Ending Balance at Mar. 31, 2018 $ 1,216,952 $ 3,670 $ 372,866 $ (155,801) $ 1,015,109 $ (18,892)
Ending Balance (in shares) at Mar. 31, 2018 36,733 36,733   7,023    
[1] Includes shares issued under the Second Amended and Restated 2005 Stock Incentive Plan to Directors and the Employee Stock Purchase Plan.