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Condensed Consolidated Statements of Comprehensive Income (Loss) (unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Comprehensive Income [Abstract]        
Net income $ 18,930 $ 30,184 $ 28,786 $ 48,242
Other comprehensive income (loss):        
Unrealized gain (loss) on valuation of interest rate swap agreements (12,346) 1,763 (19,736) 5,943
Less: amount reclassified into interest expense 169 536 318 1,135
Other comprehensive income (loss) (12,177) 2,299 (19,418) 7,078
Comprehensive income $ 6,753 $ 32,483 $ 9,368 $ 55,320