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Income Taxes - Operating loss carryfowards and tax credits (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |  |
U.K. foreign tax credits |  | $ 19,160 | $ 9,521
U.S. refundable AMT credits |  | 0 | $ 1,323
United Kingdom |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards |  | 237,277 |
U.K. foreign tax credits |  | 19,160 |
Ireland |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards |  | 11,336 |
Australia |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards |  | 37,995 |
Hong Kong |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards |  | 21,094 |
Denmark |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards |  | 23 |
United States |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | [1] | 27,425 |
U.S. refundable AMT credits |  | 0 |
Operating loss carryforward, portion subject to utilization limits |  | 8,300 |
Operating loss carryforward, annual utilization limit |  | $ 600 |
[1] | On January 30, 2014, the Company’s U.S. mortgage operations underwent an ownership change for U.S. federal income tax purposes as a result of the Company’s acquisition of the CMG Entities. As a result of this ownership change, a limitation has been imposed upon the utilization of approximately $8.3 million of the Company’s existing U.S. net operating loss carryforwards. Utilization is limited to approximately $0.6 million per year in accordance with Section 382 of the Internal Revenue Code of 1986 as amended (“the Code”).

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