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Earnings (Loss) Per Share and Equity Transactions - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Apr. 17, 2017
Dec. 01, 2016
Dec. 01, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Tender Offer Event [Line Items]            
Refund received of excess funds associated with 2016 tender offer $ 1,929,000     $ 1,929,000 $ 0 $ 0
Tender Offer Event, Shares [Member]            
Tender Offer Event [Line Items]            
Tender offer purchase price     $ 200,000,000.0      
Allowed percentage of additional shares accepted for repurchase without amendment of offer (percent)     2.00%      
Increase tender offer (shares)     14,186,716      
Refund received of excess funds associated with 2016 tender offer     $ 37,700,000      
Repurchase of common stock (shares)   89,502,449        
Share price (usd per share)   $ 2.66 $ 2.66      
Tender offer purchase price, excluding fees and expenses   $ 238,077,000        
Ratio of shares repurchased to shares outstanding (percent)   10.40% 10.40%