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, 2017
USD ($)
Changes in deferred tax asset valuation allowance:  
December 31, 2016 $ 133,192
December 31, 2017 106,466
Increase due to current year operations  
Changes in deferred tax asset valuation allowance:  
Change in valuation allowance 15,295
Decrease due to tax rate change  
Changes in deferred tax asset valuation allowance:  
Change in valuation allowance $ (42,021)