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Stock-Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation capitalized due to rig construction activity $ 0 $ 200,000 $ 0 $ 652,000
Options, exercisable (in shares) 948,803   948,803  
Remaining contractual life (years)     5 years 8 months  
Weighted-average exercise price (in dollars per share) $ 12.74   $ 12.74  
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs $ 0   $ 0  
Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation costs 1,400,000   $ 1,400,000  
Weighted average recognition period     6 months  
Restricted stock | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (years)     3 years  
Restricted stock | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (years)     4 years  
Restricted stock units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (years)     3 years  
Unrecognized compensation costs $ 3,000,000   $ 3,000,000  
Weighted average recognition period     1 year  
Restricted stock units (RSUs) | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, number of shares     1.5  
Restricted stock units (RSUs) | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights, number of shares     2  
2012 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (in shares) 4,754,000   4,754,000  
Number of shares available for future awards (in shares) 1,684,017   1,684,017  
2012 Plan | Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option expiration period (years)     10 years