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INCOME TAXES: (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2017
Subsequent Event [Line Items]          
Income tax (benefit) expense $ 719 $ (4,207) $ 3,459 $ (1,391)  
Effective tax rate (as a percent) (47.90%) 98.60% 76.50% 99.20%  
Forecast          
Subsequent Event [Line Items]          
Other noncash income tax expense         $ 7,800