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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net income $ 84,290 $ 117,253 $ 118,253
Other comprehensive loss:      
Unrealized loss on valuation of interest rate swap agreements (21,813) (2,721) (11,658)
Amount reclassified into interest expense 1,231 1,845 1,142
Other comprehensive loss (20,582) (876) (10,516)
Comprehensive income $ 63,708 $ 116,377 $ 107,737