Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Change in Deferred Tax Asset Valuation Allowance (Details)

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INCOME TAXES - Change in Deferred Tax Asset Valuation Allowance (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Changes in deferred tax asset valuation allowance:  
December 31, 2015 $ 42,158
December 31, 2016 133,192
Increase due to tax status change  
Changes in deferred tax asset valuation allowance:  
Increase in valuation allowance 77,342
Current year income  
Changes in deferred tax asset valuation allowance:  
Increase in valuation allowance $ 13,692