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Fair Value Measurements - Assets Measured at Fair Value on Non-Recurring Basis (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Impairment Losses        
Investment properties $ 0 $ 0 $ 0 $ 797
Nonrecurring        
Impairment Losses        
Investment properties 0 0 0 797
Nonrecurring | Level 3        
Impairment Losses        
Investment properties $ 0 $ 0 $ 0 $ 31,000