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INCOME TAXES (Tables)
6 Months Ended
Jun. 30, 2016
Income Tax Disclosure [Abstract]  
Schedule of income tax (expense) benefit
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2016
 
2015
 
2016
 
2015
 
(in thousands, except percentages)
Income tax expense
$
(3,572
)
 
$
(272
)
 
$
(8,370
)
 
$
(579
)
Effective tax rate
28.4
%
 
4.1
%
 
34.5
%
 
4.7
%