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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Contributed Surplus [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive loss associated companies [Member]
Retained Earnings [Member]
Starting Balance at Dec. 31, 2014 $ 1,153,492 $ 93,404 $ 285,248 $ 586,089 $ (48,240) $ (2,284) $ 239,275
Starting Balance (in shares) at Dec. 31, 2014 93,404,000 93,404,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued (in shares) 64,000 64,000          
Shares issued $ 675 $ 64 611        
Amortization of stock based compensation 0   0        
Payments in lieu of issuing shares 0            
Equity component of convertible bond issuance, net 0            
Amortization of deferred equity contributions 2,044     2,044      
Gain/(loss) on hedging financial instruments reclassified into earnings 173       173    
Fair value adjustments to hedging financial instruments 22,686       23,167 (481)  
Loss on available for sale securities reclassified into earnings 0       0    
Fair value adjustments to available for sale securities (1,206)       (1,206)    
Fair value adjustments to other financial instruments (28)         (28)  
Other comprehensive income/(loss) (44)       (44)    
Net income 101,053           101,053
Dividends declared (79,415)           (79,415)
Ending Balance at Jun. 30, 2015 $ 1,199,430 $ 93,468 285,859 588,133 (26,150) (2,793) 260,913
Ending Balance (in shares) at Jun. 30, 2015 93,468,000 93,468,000          
Starting Balance at Dec. 31, 2014 $ 1,153,492 $ 93,404 285,248 586,089 (48,240) (2,284) 239,275
Starting Balance (in shares) at Dec. 31, 2014 93,404,000 93,404,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued (in shares) 64,000 64,000          
Shares issued $ 675 $ 64 611        
Amortization of stock based compensation 0   0        
Payments in lieu of issuing shares 0            
Equity component of convertible bond issuance, net 0            
Amortization of deferred equity contributions 2,044     2,044      
Gain/(loss) on hedging financial instruments reclassified into earnings (1,348)       (1,348)    
Fair value adjustments to hedging financial instruments 27,312       27,154 158  
Loss on available for sale securities reclassified into earnings 20,552       20,552    
Fair value adjustments to available for sale securities 981       981    
Fair value adjustments to other financial instruments 0         0  
Other comprehensive income/(loss) (136)       (136)    
Net income 200,832           200,832
Dividends declared (162,594)           (162,594)
Ending Balance at Dec. 31, 2015 $ 1,241,810 $ 93,468 285,859 588,133 (1,037) (2,126) 277,513
Ending Balance (in shares) at Dec. 31, 2015 93,468,000 93,468,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares issued (in shares) 36,575 36,575          
Shares issued $ 243 $ 37 206        
Amortization of stock based compensation 139   139        
Payments in lieu of issuing shares 0            
Equity component of convertible bond issuance, net 0            
Amortization of deferred equity contributions 0     0      
Gain/(loss) on hedging financial instruments reclassified into earnings 0       0    
Fair value adjustments to hedging financial instruments (16,307)       (14,540) (1,767)  
Loss on available for sale securities reclassified into earnings 0       0    
Fair value adjustments to available for sale securities (92,077)       (92,077)    
Fair value adjustments to other financial instruments 0         0  
Other comprehensive income/(loss) 11       11    
Net income 85,611           85,611
Dividends declared (84,134)           (84,135)
Ending Balance at Jun. 30, 2016 $ 1,135,295 $ 93,505 $ 286,204 $ 588,133 $ (107,643) $ (3,893) $ 278,989
Ending Balance (in shares) at Jun. 30, 2016 93,504,575 93,504,575