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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]        
Net deferred tax asset $ 31,074,000 $ 9,989,000    
Valuation allowance 0 0    
Unrecognized tax benefits 1,047,000 0 $ 0 $ 5,421,000
Income tax penalties and interest accrued $ 0 $ 0