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Stock-based Compensation - Compensation Cost (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Stock-based compensation $ 1,210,000 $ 3,023,000 $ 1,201,000
Tax benefit from compensation expense 0 0 0
Cash received from option exercised $ 0 $ 0 $ 9,000