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Earnings Per Share and Equity Transactions - Narrative (Details) - USD ($)
12 Months Ended
May 01, 2019
Aug. 15, 2018
Dec. 31, 2019
Dec. 31, 2018
Tender Offer Event [Line Items]        
Common stock, par value (usd per share)     $ 0.001 $ 0.001
Repurchase of common stock     $ 20,384,000 $ 98,491,000
Common Stock        
Tender Offer Event [Line Items]        
Purchase price (usd per share) $ 3.14   $ 2.355  
Repurchase of common stock (in shares)     8,517,605 46,559,289
Repurchase of common stock     $ 9,000 $ 45,000
Dutch Auction        
Tender Offer Event [Line Items]        
Purchase price (usd per share)   $ 2.10    
Authorized repurchase amount   $ 75,000,000    
Common stock, par value (usd per share)   $ 0.001    
Outstanding shares, percent   2.00%    
Increase in shares authorized to be repurchased (in shares)   10,706,774    
Increase in authorized amount   $ 22,500,000    
Cost of stock repurchased   97,775,000    
Repurchase of common stock   $ 98,491,000    
Dutch Auction | Common Stock        
Tender Offer Event [Line Items]        
Repurchase of common stock (in shares)   46,559,289    
Percentage of outstanding stock   6.00%