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Consolidated Statements of Equity Consolidated Statements of Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid- In Capital
Retained Earnings
AOCI Attributable to Parent [Member]
Non Controlling Interest
Beginning balance (in shares) at Dec. 31, 2018   60,900        
Beginning balance at Dec. 31, 2018 $ 867,000 $ 600 $ 808,000 $ 121,100 $ (63,000) $ 300
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Employee stock compensation (in shares)   200        
Employee stock compensation 12,100   12,100      
Deferred compensation (1,800)   (1,500) (300)    
Proceeds from stock issuances under employee plans (in shares)   0        
Proceeds from stock issuances under employee plans 3,200 $ 0 3,200      
Cash dividends declared (37,100)     (37,100)    
Repurchase and retirement of common shares (in shares)   (100)        
Repurchase and retirement of common shares (6,200) $ 0 (1,000) (5,200)    
Other activity 0     600 (600)  
Net income 48,400     48,400    
Other comprehensive loss (6,100)       (6,100)  
Ending balance (in shares) at Mar. 31, 2019   61,000        
Ending balance at Mar. 31, 2019 879,500 $ 600 820,800 127,500 (69,700) 300
Beginning balance (in shares) at Dec. 31, 2018   60,900        
Beginning balance at Dec. 31, 2018 867,000 $ 600 808,000 121,100 (63,000) 300
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 224,900          
Ending balance (in shares) at Sep. 30, 2019   61,100        
Ending balance at Sep. 30, 2019 1,013,200 $ 600 867,200 228,800 (83,600) 200
Beginning balance (in shares) at Mar. 31, 2019   61,000        
Beginning balance at Mar. 31, 2019 879,500 $ 600 820,800 127,500 (69,700) 300
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Employee stock compensation (in shares)   0        
Employee stock compensation 22,100   22,100      
Deferred compensation (1,800)   (1,200) (600)    
Proceeds from stock issuances under employee plans (in shares)   100        
Proceeds from stock issuances under employee plans 3,000 $ 0 3,000      
Cash dividends declared (37,300)     (37,300)    
Repurchase and retirement of common shares (in shares)   0        
Repurchase and retirement of common shares (400) $ 0 (100) (300)    
Net income 88,100     88,200   (100)
Other comprehensive loss (1,100)       (1,100)  
Ending balance (in shares) at Jun. 30, 2019   61,100        
Ending balance at Jun. 30, 2019 952,100 $ 600 844,600 177,500 (70,800) 200
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Employee stock compensation (in shares)   0        
Employee stock compensation 22,300   22,300      
Deferred compensation (1,000)   (1,600) 600    
Proceeds from stock issuances under employee plans (in shares)   0        
Proceeds from stock issuances under employee plans 2,000 $ 0 2,000      
Cash dividends declared (37,300)     (37,300)    
Repurchase and retirement of common shares (in shares)   0        
Repurchase and retirement of common shares (500) $ 0 (100) (400)    
Net income 88,400     88,400   0
Other comprehensive loss (12,800)       (12,800)  
Ending balance (in shares) at Sep. 30, 2019   61,100        
Ending balance at Sep. 30, 2019 1,013,200 $ 600 867,200 228,800 (83,600) 200
Beginning balance (in shares) at Dec. 31, 2019   61,400        
Beginning balance at Dec. 31, 2019 1,108,200 $ 600 892,800 287,300 (72,700) 200
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Employee stock compensation (in shares)   400        
Employee stock compensation 11,900 $ 0 11,900      
Deferred compensation 6,900   (500) 7,400    
Proceeds from stock issuances under employee plans (in shares)   0        
Proceeds from stock issuances under employee plans 2,300   2,300      
Cash dividends declared (38,000)     (38,000)    
Repurchase and retirement of common shares (in shares)   (600)        
Repurchase and retirement of common shares (48,800) $ 0 (8,100) (40,700)    
Net income (5,400)     (5,400)   0
Other comprehensive loss (35,300)       (35,300)  
Ending balance (in shares) at Mar. 31, 2020   61,200        
Ending balance at Mar. 31, 2020 1,001,800 $ 600 898,400 210,600 (108,000) 200
Beginning balance (in shares) at Dec. 31, 2019   61,400        
Beginning balance at Dec. 31, 2019 $ 1,108,200 $ 600 892,800 287,300 (72,700) 200
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Repurchase and retirement of common shares (in shares) (600)          
Repurchase and retirement of common shares $ (49,500)          
Net income (73,900)          
Ending balance (in shares) at Sep. 30, 2020   61,700        
Ending balance at Sep. 30, 2020 947,800 $ 600 972,800 59,000 (84,900) 300
Beginning balance (in shares) at Mar. 31, 2020   61,200        
Beginning balance at Mar. 31, 2020 1,001,800 $ 600 898,400 210,600 (108,000) 200
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Employee stock compensation (in shares)   0        
Employee stock compensation 19,800 $ 0 19,800      
Deferred compensation (7,500)   (1,400) (6,100)    
Proceeds from stock issuances under employee plans (in shares)   100        
Proceeds from stock issuances under employee plans 4,600   4,600      
Cash dividends declared (38,000)     (38,000)    
Repurchase and retirement of common shares (in shares)   0        
Repurchase and retirement of common shares (500) $ 0 (100) (400)    
Net income (235,400)     (235,400)   0
Other comprehensive loss 8,400       8,400  
Ending balance (in shares) at Jun. 30, 2020   61,300        
Ending balance at Jun. 30, 2020 753,200 $ 600 921,300 (69,300) (99,600) 200
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Employee stock compensation (in shares)   0        
Employee stock compensation 27,700 $ 0 27,700      
Deferred compensation (2,000)   (1,900) (100)    
Proceeds from stock issuances under employee plans (in shares)   400        
Proceeds from stock issuances under employee plans 25,700   25,700      
Cash dividends declared (38,200)     (38,200)    
Repurchase and retirement of common shares (in shares)   0        
Repurchase and retirement of common shares (200) $ 0 0 (200)    
Net income 166,900     166,800   100
Other comprehensive loss 14,700       14,700  
Ending balance (in shares) at Sep. 30, 2020   61,700        
Ending balance at Sep. 30, 2020 $ 947,800 $ 600 $ 972,800 $ 59,000 $ (84,900) $ 300