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CONSOLIDATED STATEMENTS OF EQUITY (unaudited) - USD ($)
$ in Thousands
Total
Total
Total
Restricted Stock Units
Total
Stock Appreciation Rights
Non- controlling interests subject to put provisions
Common stock
Common stock
Restricted Stock Units
Common stock
Stock Appreciation Rights
Additional paid-in capital
Additional paid-in capital
Restricted Stock Units
Additional paid-in capital
Stock Appreciation Rights
Retained earnings
Treasury stock
Accumulated other comprehensive (loss) income
Non- controlling interests not subject to put provisions
Beginning balance at Dec. 31, 2016   $ 4,648,047     $ 973,258 $ 195     $ 1,027,182     $ 3,710,313 $ 0 $ (89,643) $ 201,694
Beginning Balance (in shares) at Dec. 31, 2016           194,554,000             0    
Comprehensive income:                              
Other comprehensive income (loss) $ 12,755                            
Beginning balance at Dec. 31, 2016   4,648,047     973,258 $ 195     1,027,182     3,710,313 $ 0 (89,643) 201,694
Beginning Balance (in shares) at Dec. 31, 2016           194,554,000             0    
Comprehensive income:                              
Net income   663,618     103,641             663,618     63,296
Other comprehensive income (loss)   102,878                       102,878 (2)
Stock purchase shares issued (in shares)           360,000                  
Stock purchase shares issued   22,131             22,131            
Stock unit shares issued (in shares)             117,000 398,000              
Stock unit shares issued     $ (101) $ 0           $ 101 $ 0        
Stock-settled stock-based compensation expense   34,981             34,981            
Changes in noncontrolling interest from:                              
Distributions         (128,853)                   (82,614)
Contributions         52,911                   21,641
Acquisitions and divestitures   (823)     43,799       (823)           (5,770)
Partial purchases   (2,752)     (397)       (2,752)           (2,208)
Fair value remeasurements   32,999     (32,999)       32,999            
Purchase of treasury stock (in shares)                         (12,967,000)    
Purchase of treasury stock   (810,949)                     $ (810,949)    
Retirement of treasury stock           (12,967,000)             12,967,000    
Retirement of treasury stock   0       $ (13)     (70,718)     (740,218) $ 810,949    
Ending balance at Dec. 31, 2017 $ 4,886,066 4,690,029     1,011,360 $ 182     1,042,899     3,633,713 $ 0 13,235 196,037
Ending Balance (in shares) at Dec. 31, 2017 182,462,278         182,462,000             0    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                              
Cumulative Effect of New Accounting Principle in Period of Adoption   0                   8,368   (8,368)  
Comprehensive income:                              
Net income   178,686     24,107             178,686     22,436
Other comprehensive income (loss) $ 22,468 22,468                       22,468  
Stock unit shares issued (in shares)             4,000 195,000              
Stock unit shares issued     $ (4,886)       $ 1     $ 4,887        
Stock-settled stock-based compensation expense   9,682             9,682            
Changes in noncontrolling interest from:                              
Distributions         (26,166)                   (19,301)
Contributions         9,508                   2,501
Acquisitions and divestitures   76     688       76           (66)
Partial purchases   (1,994)             (1,994)           (206)
Fair value remeasurements   (15,004)     15,004       (15,004)            
Purchase of treasury stock (in shares) (4,197,000)                       (4,197,000)    
Purchase of treasury stock $ (298,377) (298,377)                     $ (298,377)    
Ending balance at Mar. 31, 2018 $ 4,782,081 $ 4,580,680     $ 1,034,501 $ 183     $ 1,030,772     $ 3,820,767 $ (298,377) $ 27,335 $ 201,401
Ending Balance (in shares) at Mar. 31, 2018 178,463,408         182,661,000             (4,197,000)