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Condensed Consolidated Statements of Changes in Equity (Unaudited) - 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
Beginning 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 from noncontrolling interests 2,310 2,310
Net income 76,733 76,733 1,482 78,215
Change in unrealized gain related to available-for-sale securities 28 28 28
Change in unrealized loss on interest rate swap 188 188 188
Change in foreign currency translation adjustments 503 503 503
Redeemable noncontrolling interests income (1,066) (1,066)
Dividends (126,476) (126,476) (126,476)
Distributions to noncontrolling interests (1,250) (1,250)
Issuance of common stock $ 8 (8)
Issuance of common stock (in shares)     776,000        
Surrender of restricted stock $ (2) (4,989) (4,991) (4,991)
Surrender of restricted stock (in shares)     (200,000)        
Exercise of common stock options 560 560 560
Exercise of common stock options (in shares)     30,000        
Amortization of equity awards 8,651 8,651 8,651
Balance (in shares) at Mar. 31, 2017     32,000 425,640,000        
Ending balance at Mar. 31, 2017 (726,610) 6,485 $ 32 $ 4,256 5,927,172 5,211,335 148,211 5,359,546
Beginning 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        
Net income 144,090 144,090 (108) 143,982
Change in unrealized gain related to available-for-sale securities              
Change in unrealized loss on interest rate swap 278 278 278
Redeemable noncontrolling interests income (92) (92)
Dividends (133,560) (133,560) (133,560)
Distributions to noncontrolling interests (1,472) (1,472)
Issuance of common stock $ 11 (11)
Issuance of common stock (in shares)     1,075,000        
Surrender of restricted stock $ (2) (3,372) (3,374) (3,374)
Surrender of restricted stock (in shares)     (224,000)        
Exercise of common stock options 30 30 30
Exercise of common stock options (in shares)     3,000        
Amortization of equity awards 4,719 4,719 4,719
Balance (in shares) at Mar. 31, 2018     43,000 424,900,000        
Adoption of accounting policy (Accounting Standards Update 2017-05 [Member]) at Dec. 31, 2017 [1] 8,098         8,098   8,098
Adoption of accounting policy (Accounting Standards Update 2016-01 [Member]) at Dec. 31, 2017 [1] (1,136) 1,136            
Balance at Dec. 31, 2017 (754,375) (344) $ 41 $ 4,256 6,152,764 5,402,342 127,903 5,530,245
Repurchase of common stock $ (16) (24,260) (24,276) $ (24,276)
Repurchase of common stock (in shares)     (1,600,000)       (1,600,000)
Issuance of preferred stock $ 2 33,112 33,114 $ 33,114
Issuance of preferred stock (in shares)     2,000        
Acquisition/deconsolidation of noncontrolling interests 1,203 1,203 (48,395) (47,192)
Ending balance at Mar. 31, 2018 $ (743,845) $ (66) $ 43 $ 4,249 $ 6,164,185 $ 5,424,566 $ 77,836 $ 5,502,402
[1] Represents the impact of change in accounting policies for its respective Accounting Standard Updates ("ASU"). See Footnote 2 of the Notes to Condensed Consolidated Financial Statements for additional disclosure.