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Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Apr. 03, 2019
Dec. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2019
Jun. 30, 2018
Jan. 01, 2018
Equity [Abstract]              
Stock Options Excluded From Diluted Common Shares Outstanding Calculation     700,000 4,000,000      
Forward Contract Indexed to Issuer's Equity, Indexed Shares     8,448,171     15,300,000  
Forward Contract Indexed to Issuer's Equity, Shares     2,000,000        
Proceeds from Issuance of Common Stock   $ 500,000          
Shares, Issued     860,093        
Common stock dividend (in dollars per share)     $ 0.91 $ 0.89      
Accumulated Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, after Tax             $ 632,617
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         $ 0   $ (56,360)
Tax Cuts and Jobs Act, Reclassification from AOCI resulting from stranded tax effects       $ 15,505      
Accounting Standards Update 2017-12 [Member]              
Equity [Abstract]              
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         8,000    
Accounting Standards Update 2017-08 [Member]              
Equity [Abstract]              
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         $ 1,000    
Common Stock [Member]              
Equity [Abstract]              
Forward Contract Indexed to Issuer's Equity, Shares   6,834,221          
Subsequent Event [Member]              
Equity [Abstract]              
Common stock dividend (in dollars per share) $ 0.91