Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)

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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Of Cash Flows [Abstract]      
Tax effect on fair value of interest rate swap and rate cap agreements $ 2,351 $ 2,178 $ 205