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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 $ 59,497 $ 23,655 $ 30,973
Changes in derivative instrument:      
Net change in fair value of interest rate swaps (240) 216 (43)
Net (loss) gain reclassified to interest expense (1) (2) 3
Tax benefit (expense) 86 (76) 14
Net change in derivative instrument (155) 138 (26)
Foreign currency translation adjustments 3,052 (975) (1,186)
Other comprehensive income (loss), net of tax 2,897 (837) (1,212)
Total comprehensive income $ 62,394 $ 22,818 $ 29,761