Annual report pursuant to Section 13 and 15(d)

EQUITY (Accumulated Other Comprehensive Income (Loss)) (Details)

v3.8.0.1
EQUITY (Accumulated Other Comprehensive Income (Loss)) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Number of settled instruments designated as cash flow hedges     1
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance $ (176,707) $ (111,657) $ (70,010)
Other comprehensive income (loss) before reclassifications 67,704 (65,050) (41,672)
Amount reclassified from AOCI 461 0 25
Net other comprehensive income (loss) 68,165 (65,050) (41,647)
Ending balance (108,542) (176,707) (111,657)
Foreign Currency Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (176,246) (111,299) (69,404)
Other comprehensive income (loss) before reclassifications 67,704 (64,947) (41,895)
Amount reclassified from AOCI 0 0 0
Net other comprehensive income (loss) 67,704 (64,947) (41,895)
Ending balance (108,542) (176,246) (111,299)
Accumulated Other Comprehensive (Income) Loss Other [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Beginning balance (461) (358) (606)
Other comprehensive income (loss) before reclassifications 0 (103) 223
Amount reclassified from AOCI 461 0 25
Net other comprehensive income (loss) 461 (103) 248
Ending balance $ 0 $ (461) $ (358)