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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net income $ 118,253 $ 107,250 $ 79,928
Other comprehensive loss:      
Unrealized loss on valuation of interest rate swap agreements (11,658) (3,054) (1,922)
Amount reclassified into interest expense 1,142 0 0
Other comprehensive loss (10,516) (3,054) (1,922)
Comprehensive income $ 107,737 $ 104,196 $ 78,006