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Stock-Based Compensation - Stock Option Activity (Details) - $ / shares
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Options    
Options, beginning balance (in shares) 669,213  
Options, granted (in shares) 0 0
Options, exercised (in shares) 0  
Options, forfeited/expired (in shares) 0  
Options, ending balance (in shares) 669,213.000  
Options, exercisable (in shares) 669,213  
Weighted Average Exercise Price    
Weighted average exercise price, beginning balance (in dollars per share) $ 12.74  
Weighted average exercise price, granted (in dollars per share) 0.00  
Weighted average exercise price, exercised (in dollars per share) 0.00  
Weighted average exercise price, forfeited/expired (in dollars per share) 0.00  
Weighted average exercise price, ending balance (in dollars per share) 12.74  
Weighted-average exercise price, exercisable (in dollars per share) $ 12.74