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INCOME TAXES - Schedule of Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Current Taxes:        
Federal $ 19,215 $ 16,568 $ 30,788 $ 23,109
State 2,410 2,590 4,034 3,965
Total $ 21,625 $ 19,158 $ 34,822 $ 27,074