Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (Parenthetical)

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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
OPERATING COSTS AND EXPENSES        
Depreciation and amortization $ 4,128 $ 2,837 $ 8,357 $ 5,667