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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income $ 55,439 $ 16,835 $ 42,085
Other comprehensive income (loss):      
Unrealized gain (loss) on effective portion of cash flow hedges, net of tax of $51, $2,696, and $8,722 in 2017, 2016 and 2015, respectively 149 4,307 (14,051)
Reclassification of cash flow hedge losses into statement of operations, net of tax of $1,719, $6,634, and $5,964 in 2017, 2016, and 2015, respectively 2,784 10,597 9,608
Total other comprehensive income (loss) 2,933 14,904 (4,443)
Comprehensive income $ 58,372 $ 31,739 $ 37,642