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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - USD ($)
$ in Thousands
Share Capital [Member]
Treasury Shares [Member]
Currency Translation Reserve [Member]
Cash Flow Hedging Reserve [Member]
Actuarial Gains Or Losses On Defined Benefit Plans Reserve [Member]
Shares Based Payments Reserve [Member]
Other Sundry Reserves [Member]
Total Other Reserve [Member]
Retained Earnings [Member]
Parent's Ownership Interest [Member]
Non-controlling interests [member]
Total
Beginning balance at Dec. 31, 2014 $ 2,545,705 $ (178) $ (1,193,871) $ (151,340) $ 29,642 $ 2,635,748 $ 1,320,179 $ 536,190 $ 4,401,896 $ 101,799 $ 4,503,695
Changes in Equity [Roll Forward]                        
Total increase (decrease ) in equity Comprehensive income Gain (losses )                 (219,274) (219,274) 40,542 (178,732)
Other comprehensive income     (1,382,170) 60,830 (10,717)     (1,332,057)   (1,332,057) (28,818) (1,360,875)
Total comprehensive income     (1,382,170) 60,830 (10,717)     (1,332,057) (219,274) (1,551,331) 11,724 (1,539,607)
Transactions with shareholders                        
Increase (decrease ) through transfers and other changes , equity           6,005 (1,069) 4,936 1,034 5,970 (32,510) (26,540)
Total transactions with shareholders           6,005 (1,069) 4,936 1,034 5,970 (32,510) (26,540)
End balance at Dec. 31, 2015 2,545,705 (178) (2,576,041) (90,510) (10,717) 35,647 2,634,679 (6,942) 317,950 2,856,535 81,013 2,937,548
Changes in Equity [Roll Forward]                        
Total increase (decrease ) in equity Comprehensive income Gain (losses )                 69,220 69,220 41,450 110,670
Other comprehensive income     489,486 92,016 (2,183)     579,319   579,319 5,554 584,873
Total comprehensive income     489,486 92,016 (2,183)     579,319 69,220 648,539 47,004 695,543
Transactions with shareholders                        
Equity issue 608,496                 608,496   608,496
Dividends                 (20,766) (20,766)   (20,766)
Increase (decrease ) through transfers and other changes , equity (4,637)         2,891 5,602 8,493   3,856 (39,373) (35,517)
Total transactions with shareholders 603,859         2,891 5,602 8,493 (20,766) 591,586 (39,373) 552,213
End balance at Dec. 31, 2016 3,149,564 (178) (2,086,555) 1,506 (12,900) 38,538 2,640,281 580,870 366,404 4,096,660 88,644 4,185,304
Changes in Equity [Roll Forward]                        
Total increase (decrease ) in equity Comprehensive income Gain (losses )                 155,304 155,304 45,410 200,714
Other comprehensive income     (45,036) 16,634 1,974     (26,428)   (26,428) (2,515) (28,943)
Total comprehensive income     (45,036) 16,634 1,974     (26,428) 155,304 128,876 42,895 171,771
Transactions with shareholders                        
Dividends                 (46,590) (46,590)   (46,590)
Increase (decrease ) through transfers and other changes , equity (3,299)         943 (501) 442   (2,857) (40,392) (43,249)
Total transactions with shareholders (3,299)         943 (501) 442 (46,590) (49,447) (40,392) (89,839)
End balance at Dec. 31, 2017 $ 3,146,265 $ (178) $ (2,131,591) $ 18,140 $ (10,926) $ 39,481 $ 2,639,780 $ 554,884 $ 475,118 $ 4,176,089 $ 91,147 $ 4,267,236