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Taxation (Income Tax Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Expected income tax (expense) benefit									$ (22,874)	$ 17,697	$ 14,216
Nondeductible expenses									(7,059)	(370)	(276)
Change in valuation allowance									(5,481)	(5,255)	(11,718)
Withholding tax									(665)	(1,831)	(216)
Effect of change in tax rate									(262)	(708)	(38,083)
Non-taxable foreign exchange gains (losses)									(4)	586	2,574
Tax exempt income									400	944	3,794
Transfer pricing									2,503	(2,481)	(11)
GAAP to statutory accounting difference									6,553	0	0
Foreign branch adjustments									7,315	0	0
U.S. base erosion and anti-abuse tax									0	(1,271)	0
Other									2,359	(1,009)	3,233
Income tax (expense) benefit	$ 3,455	$ (3,664)	$ (9,475)	$ (7,531)	$ 8,852	$ (1,451)	$ (4,506)	$ 3,407	$ (17,215)	$ 6,302	$ (26,487)

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