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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net income $ 117,253 $ 118,253 $ 107,250
Other comprehensive loss:      
Unrealized loss on valuation of interest rate swap agreements (2,721) (11,658)  
Unrealized loss on valuation of interest rate swap agreements     (3,054)
Amount reclassified into interest expense 1,845 1,142  
Amount reclassified into interest expense     0
Other comprehensive loss (876) (10,516) (3,054)
Comprehensive income $ 116,377 $ 107,737 $ 104,196