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Commitments and Contingencies - Schedule of Contractual Obligation (Details) - Dec. 31, 2017
$ in Thousands, £ in Millions
USD ($)
GBP (£)
Other Commitments [Line Items]    
Total $ 251,298  
2018 177,200  
2019-2020 71,056  
2021-2022 3,042  
More than Five Years 0  
U.K. loan commitments    
Other Commitments [Line Items]    
Total 3,236 £ 2
2018 3,236  
2019-2020 0  
2021-2022 0  
More than Five Years 0  
Construction loan commitments    
Other Commitments [Line Items]    
Total 114,691  
2018 45,863  
2019-2020 68,828  
2021-2022 0  
More than Five Years 0  
Development commitments    
Other Commitments [Line Items]    
Total 133,371  
2018 128,101  
2019-2020 2,228  
2021-2022 3,042  
More than Five Years $ 0