[Line Items] for income tax [Table]

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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-Publisher FASB
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-Topic 740
-SubTopic 10
-Section 50
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount recognized for uncertainty in income taxes classified as current.

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Income taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Income taxes (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Tax
Deferred Tax Assets, Net	$ 7,600		$ 7,600		$ 9,100
Provision for uncertain tax positions	1,500		1,500		$ 1,500
Income tax expense	(213)	$ (111)	1,431	$ 4,407
Income tax expense (benefit) related to U.S. and U.K. subsidiaries (1)
Income Tax
Income tax expense	(213)	(1,180)	1,431	(1,968)
Change in uncertain tax positions (2)
Income Tax
Income tax expense	0	0	0	50
Withholding taxes on certain investment transactions (2)
Income Tax
Income tax expense	$ 0	$ 1,069	$ 0	$ 6,325