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Consolidated Statements of Changes in Equity - USD ($)
$ in Thousands
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Parent [Member]
Noncontrolling Interest [Member]
Total
Balance at Dec. 31, 2014 $ (1,006,578) $ 45,122 $ 102 $ 4,118 $ 5,732,021 $ 4,774,785 $ 126,980 $ 4,901,765
Balance (in shares) at Dec. 31, 2014     102,000 411,820,000        
Contributions/deemed contributions from noncontrolling interests 66,163 66,163
Comprehensive income:                
Net income 894,115 894,115 6,028 900,143
Other comprehensive income, net of tax:                
Change in unrealized gains/losses related to available-for-sale securities (45,799) (45,799) (45,799)
Change in unrealized losses on interest rate swaps (22) (22) (22)
Change in foreign currency translation adjustments 6,287 6,287 6,287
Redeemable noncontrolling interests income (7,061) (7,061)
Dividends (459,872) (459,872) (459,872)
Distributions to noncontrolling interests (8,539) (8,539)
Net Proceeds, After Expenses $ 8 485 493 493
Depositary Shares Issued (in shares)     824,000        
Surrender of restricted stock $ (2) (5,680) (5,682) (5,682)
Surrender of restricted stock (in shares)     (232,000)        
Exercise of common stock options $ 10 18,698 18,708 $ 18,708
Exercise of common stock options (in shares)     1,019,000       1,019,240
Sale of interests in investments, net of tax of $16.0 million 23,993 23,993 $ 23,993
Acquisition of noncontrolling interests 262 262 (47,920) (47,658)
Amortization of equity awards 14,032 14,032 14,032
Redemption of preferred stock $ (70) (174,930) (175,000) (175,000)
Redemption of preferred stock (in shares)     (70,000)        
Contributions/deemed contributions from noncontrolling interests 66,163 66,163
Balance at Dec. 31, 2015 (572,335) 5,588 $ 32 $ 4,134 5,608,881 5,046,300 135,651 5,181,951
Balance (in shares) at Dec. 31, 2015     32,000 413,431,000        
Contributions/deemed contributions from noncontrolling interests 16,667 16,667
Comprehensive income:                
Net income 378,850 378,850 7,288 386,138
Other comprehensive income, net of tax:                
Change in unrealized gains/losses related to available-for-sale securities 8 8 8
Change in unrealized losses on interest rate swaps 451 451 451
Change in foreign currency translation adjustments (281) (281) (281)
Redeemable noncontrolling interests income (4,349) (4,349)
Dividends (483,382) (483,382) (483,382)
Distributions to noncontrolling interests (8,522) (8,522)
Net Proceeds, After Expenses $ 107 286,314 286,421 286,421
Depositary Shares Issued (in shares)     10,711,000        
Surrender of restricted stock $ (3) (7,005) (7,008) (7,008)
Surrender of restricted stock (in shares)     (276,000)        
Exercise of common stock options $ 12 21,048 21,060 $ 21,060
Exercise of common stock options (in shares)     1,168,000       1,167,819
Amortization of equity awards 13,720 13,720 $ 13,720
Contributions/deemed contributions from noncontrolling interests 16,667 16,667
Balance at Dec. 31, 2016 (676,867) 5,766 $ 32 $ 4,250 5,922,958 5,256,139 146,735 5,402,874
Balance (in shares) at Dec. 31, 2016     32,000 425,034,000        
Contributions/deemed contributions from noncontrolling interests 48,877 48,877
Comprehensive income:                
Net income 426,075 426,075 13,596 439,671
Other comprehensive income, net of tax:                
Change in unrealized gains/losses related to available-for-sale securities (1,542) (1,542) (1,542)
Change in unrealized losses on interest rate swaps 631 631 631
Change in foreign currency translation adjustments (6,335) (6,335) (6,335)
Redeemable noncontrolling interests income (1,297) (1,297)
Dividends (510,545) (510,545) (510,545)
Distributions to noncontrolling interests (13,995) (13,995)
Net Proceeds, After Expenses $ 8 (8)
Depositary Shares Issued (in shares)     776,000        
Surrender of restricted stock $ (2) (5,697) (5,699) (5,699)
Surrender of restricted stock (in shares)     (248,000)        
Exercise of common stock options 1,526 1,526 $ 1,526
Exercise of common stock options (in shares)     84,000       83,863
Amortization of equity awards 18,983 18,983 $ 18,983
Redemption of preferred stock $ (9) (224,991) (225,000) (225,000)
Redemption of preferred stock (in shares)     (9,000)        
Contributions/deemed contributions from noncontrolling interests 48,877 48,877
Issuance of preferred stock $ 18 439,401 439,419 439,419
Issuance of preferred stock (in shares)     18,000        
Redemption/conversion of noncontrolling interests 592 592 (66,013) (65,421)
Balance at Dec. 31, 2017 $ (761,337) $ (1,480) $ 41 $ 4,256 $ 6,152,764 $ 5,394,244 $ 127,903 $ 5,522,147
Balance (in shares) at Dec. 31, 2017     41,000 425,646,000