ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated other comprehensive income activity
Balance at the beginning of the period	$ 1,311,738
Balance at the end of the period	1,422,556	$ 1,311,738
Foreign Currency
Accumulated other comprehensive income activity
Balance at the beginning of the period	(185,503)	(259,888)	$ (206,725)
Other comprehensive income (loss) before reclassifications	(62,898)	74,385	(52,795)
Amounts reclassified from accumulated other comprehensive income			(368)
Net current-period other comprehensive income (loss)	(62,898)	74,385	(53,163)
Balance at the end of the period	(248,401)	(185,503)	(259,888)
Defined Benefit Pension Plans
Accumulated other comprehensive income activity
Balance at the beginning of the period	(64,595)	(59,775)	(55,550)
Other comprehensive income (loss) before reclassifications	5,266	(8,944)	(7,617)
Amounts reclassified from accumulated other comprehensive income	5,524	4,124	3,392
Net current-period other comprehensive income (loss)	10,790	(4,820)	(4,225)
Balance at the end of the period	(60,463)	(64,595)	(59,775)
Derivatives
Accumulated other comprehensive income activity
Balance at the beginning of the period	(3,204)	(46)	(72)
Other comprehensive income (loss) before reclassifications	16,624	(11,806)
Amounts reclassified from accumulated other comprehensive income	(15,060)	8,648	26
Net current-period other comprehensive income (loss)	1,564	(3,158)	26
Balance at the end of the period	(1,640)	(3,204)	(46)
Accumulated Other Comprehensive Income/(Loss)
Accumulated other comprehensive income activity
Balance at the beginning of the period	(253,302)	(319,709)	(262,347)
Other comprehensive income (loss) before reclassifications	(41,008)	53,635	(60,412)
Amounts reclassified from accumulated other comprehensive income	(9,536)	12,772	3,050
Net current-period other comprehensive income (loss)	(50,544)	66,407	(57,362)
Balance at the end of the period	(310,504)	$ (253,302)	$ (319,709)
Accumulated Other Comprehensive Income/(Loss) \| Accounting Standards Update 2018-02
Accumulated other comprehensive income activity
Adoption of accounting standards	$ (6,658)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of the cumulative effect on retained earnings net of related income tax effect.

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