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Consolidated Statements of Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement [Abstract]          
Net gain on disposal $ 0 $ 0 $ 272 $ 0 $ 1,275