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Restricted Stock Units - Narrative (Details) - USD ($)
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Tax benefit recognized for stock-based compensation $ 0   $ 0 $ 0 $ 0  
Compensation cost capitalized as part of the cost of an asset $ 0   $ 0 $ 0 $ 0  
Vested deferred restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unvested units outstanding (in shares) 2,387     2,387   3,196
Unrecognized stock-based compensation expense, other than options $ 1,242,000     $ 1,242,000    
Vested deferred restricted stock units | Non-Employee Director            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vested and remaining outstanding (in shares)   387   988    
Performance-based Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unvested units outstanding (in shares) 1,715     1,715    
Unrecognized stock-based compensation expense, other than options $ 982,000     $ 982,000    
Time-based Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unvested units outstanding (in shares) 672     672    
Unrecognized stock-based compensation expense, other than options $ 260,000     $ 260,000    
Weighted average period for amortization of unrecognized stock-based compensation       10 months 2 days