Financial Information by Segment & Geographic Area - Schedule of Income from Operations before Income Taxes and Finance Costs, Corporate and Other (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Restructuring expenses/(income)	$ 3,628	$ 15,620	$ 6,492
Long Term Incentive Plan	9,438	13,919	8,835
Expenses/(income) from operations before income taxes and finance costs	(120,137)	(168,254)	(84,596)
Corporate and other
Segment Reporting Information [Line Items]
Restructuring expenses/(income)	3,628	(24,633)	6,492
Consulting fees related to Company strategy	3,005	4,804	2,807
Long Term Incentive Plan	9,438	13,919	8,835
Other non-operating	6,844	5,000	2,070
Expenses/(income) from operations before income taxes and finance costs	$ 22,916	$ (910)	$ 20,204