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Investment in Unconsolidated Affiliate (Tables)
 3 Months Ended
Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]  
Equity Method Investments
Condensed income statement information for the three months ended March 31, 2019 and 2018 for DTA is presented in the following table:
 
Three Months Ended March 31,
 
2019
 
2018
Operating expenses
$
6,734

 
$
6,217

Other income, net
$
(5,287
)
 
$
(5,364
)
Total expenses, net
$
1,447

 
$
853

Contributions from partners to fund continuing operations
$
5,464

 
$
788

Expenses (over)/under contributions
$
4,017

 
$
(65
)
Depreciation and amortization
$
1,344

 
$
1,396