Annual report pursuant to Section 13 and 15(d)

INCOME TAXES Income Taxes - Narrative (Details)

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INCOME TAXES Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Contingency [Line Items]      
Income tax expense (benefit) $ (24,193) $ 2,041 $ (13,369)
Valuation allowance 392 $ 0  
Operating loss carryforwards 62,800    
Accounting Standards Update 2016-09      
Income Tax Contingency [Line Items]      
Income tax expense (benefit) 253    
Expire In 2035      
Income Tax Contingency [Line Items]      
Operating loss carryforwards $ 4,000