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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Consolidated Statements of Comprehensive Income      
Net income (loss) $ 13,069 $ (15,944) $ 8,378
Comprehensive income:      
Unrealized gain on derivative financial instruments 2,599 6,688 12,589
Total comprehensive income 2,599 6,688 12,589
Comprehensive income (loss) $ 15,668 $ (9,256) $ 20,967