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Related party transactions - Proportionate share of income (loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
PRLP 2011 Holding, LLC        
Related Party Transaction [Line Items]        
Share of (loss) income from equity method investments $ 109 $ (53) $ (11) $ (312)
PR Asset Portfolio 2013-1 International, LLC        
Related Party Transaction [Line Items]        
Share of (loss) income from equity method investments $ 247 $ (53) $ 543 $ (5,409)