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Financing Arrangement - Financing Arrangement Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Schedule of Joint Ventures [Line Items]        
Interest income (expense) $ 1,074 $ 2,175 $ 8,481 $ 6,567
Joint Venture | Financing Arrangement        
Schedule of Joint Ventures [Line Items]        
Distributions of the partner's share of net income 2,111 0 6,577 0
Distributions in excess of the partner's share of net income 1,754 0 4,803 0
Adjustment to fair value of financing arrangement obligation (4,893) 0 (9,279) 0
Interest income (expense) $ (1,028) $ 0 $ 2,101 $ 0