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Financial Instruments and Fair Value Measurements - Investment in unconsolidated JVs and Long-lived assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Financial Instruments and Fair Value Measurements        
Impairment loss on investment in unconsolidated joint ventures $ 0 $ 0 $ 0 $ 0