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Investments - Schedule of Other Investments (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2019
USD ($)
Other Investments  
Fair value - partnerships $ 9,139
Other investments, cost 11,599
Total other investments 12,374
Unrealized Loss 0
Unrealized Gain 775
Certificates of Deposit  
Other Investments  
Fair value - certificates of deposit 300
Other investments, cost 300
Unrealized Loss 0
Unrealized Gain 0
Limited Partnership  
Other Investments  
Fair value - partnerships 9,139
Other investments, cost 8,365
Unrealized Loss 0
Unrealized Gain 774
Short-term Investments  
Other Investments  
Fair value - certificates of deposit 2,935
Other investments, cost 2,934
Unrealized Loss 0
Unrealized Gain $ 1