Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Unrecognized Tax Benefits (Details)

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INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Gross unrecognized tax benefits    
Balance at the beginning of the year $ 17,278 $ 5,374
Increase related to prior year tax positions   11,332
(Decrease) related to prior year tax positions (11,332)  
Increase related to current year tax positions 957 572
Balance at the end of the year 6,903 17,278
Unrecognized tax benefits, if recognized, would result in adjustments to other tax accounts, primarily deferred taxes 5,400 $ 12,200
Income tax benefit 0  
Tax positions subject to interest or penalties $ 0