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Equity Method Investments - Ownership (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Equity Method Investment, Proportional Ownership Activity [Roll Forward]        
Opening balance $ 5,102 $ 5,342 $ 5,060 $ 5,006
Distributions (547) (687) (1,059) (938)
Share of net income 663 699 1,217 1,286
Closing balance $ 5,218 $ 5,354 $ 5,218 $ 5,354