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Related party transactions - Proportionate share of income (loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
PRLP 2011 Holding, LLC        
Related Party Transaction [Line Items]        
Share of (loss) income from equity method investments $ (65) $ 55 $ (76) $ (257)
PR Asset Portfolio 2013-1 International, LLC        
Related Party Transaction [Line Items]        
Share of (loss) income from equity method investments $ (236) $ 112 $ 306 $ (5,297)