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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Net income $ 3,933 $ 18,343 $ 32,920
Other comprehensive income (loss), net of tax      
Change in unrealized income with realized income on the Statement of Income 38 (18) (31)
Total other comprehensive income (loss), net of tax 38 (18) (31)
Comprehensive income $ 3,971 $ 18,325 $ 32,889