Interim Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (1,491)	$ (77,761)	$ (75,492)	$ (137,021)
Other comprehensive loss, net of tax:
Interest rate swaps	(254)	(3,845)	(3,144)	(5,791)
Actuarial gain (loss)	25	(8)	(42)	(8)
Foreign currency translation adjustments	(2,051)	(8)	(7,564)	(1,832)
Total other comprehensive loss, net of tax	(2,280)	(3,861)	(10,750)	(7,631)
Comprehensive loss	$ (3,771)	$ (81,622)	$ (86,242)	$ (144,652)