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Stock-Based Compensation (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
plan
shares
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense | $ $ 100,000 $ 200,000 $ 100,000 $ 400,000  
Number of share-based compensation plans | plan     4    
Number of shares available for grant (in shares) | shares 0   0    
Stock Appreciation Rights (SARs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense | $     $ 0   $ 0
Number of awards outstanding (in shares) | shares 100,000   100,000   200,000
Stock Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense | $ $ 100,000 $ 200,000      
Stock Incentive Plan 2011          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for grant (in shares) | shares 226,510   226,510