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ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated other comprehensive income activity    
Balance at the beginning of the period $ 1,311,738  
Balance at the end of the period 1,404,467  
Foreign Currency    
Accumulated other comprehensive income activity    
Balance at the beginning of the period (185,503) $ (259,888)
Other comprehensive income (loss) before reclassifications 22,924 23,184
Net current-period other comprehensive income (loss) 22,924 23,184
Balance at the end of the period (162,579) (236,704)
Defined Benefit Pension Plans    
Accumulated other comprehensive income activity    
Balance at the beginning of the period (64,595) (59,775)
Amounts reclassified from accumulated other comprehensive income 1,356 879
Net current-period other comprehensive income (loss) 1,356 879
Balance at the end of the period (63,239) (58,896)
Derivatives    
Accumulated other comprehensive income activity    
Balance at the beginning of the period (3,204) (46)
Other comprehensive income (loss) before reclassifications (4,715)  
Amounts reclassified from accumulated other comprehensive income 5,068 7
Net current-period other comprehensive income (loss) 353 7
Balance at the end of the period (2,851) (39)
Accumulated Other Comprehensive Income/(Loss)    
Accumulated other comprehensive income activity    
Balance at the beginning of the period (253,302) (319,709)
Other comprehensive income (loss) before reclassifications 18,209 23,184
Amounts reclassified from accumulated other comprehensive income 6,424 886
Net current-period other comprehensive income (loss) 24,633 24,070
Balance at the end of the period $ (228,669) $ (295,639)