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Long-Term Debt (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2015
Nov. 05, 2015
Dec. 31, 2014
Nov. 05, 2014
Aug. 13, 2014
May. 12, 2014
Feb. 21, 2014
May. 10, 2013
Debt Instrument [Line Items]                
Long-term debt $ 61,361,000   $ 0          
Revolving credit facility                
Debt Instrument [Line Items]                
Borrowing limit based on eligible trade accounts 85.00%              
Eligible trade accounts receivable days outstanding limit 90 days              
Borrowing limit based on appraised forced liquidation of eligible completed and owned drilling rigs 75.00%              
Commitment fee on unused capacity (as a percentage) 0.50%              
Revolving credit facility | Line of credit                
Debt Instrument [Line Items]                
Interest rate, basis spread based on availability 3.50%              
Line of credit facility, higher borrowing capacity option $ 20,000,000.0              
Line of credit facility, springing lock box arrangement, threshold $ 15,000,000              
Line of credit facility, springing lock box arrangement, threshold, percentage of borrowing base 15.00%              
LIne of credit facility, springing lock box arrangement, threshold, percentage of total commitments 15.00%              
Long-term debt $ 61,400,000              
Remaining availability $ 63,300,000              
Revolving credit facility | Line of credit | LIBOR                
Debt Instrument [Line Items]                
Interest rate, basis spread 4.50%              
Revolving credit facility | Line of credit | Three-month LIBOR                
Debt Instrument [Line Items]                
Interest rate, basis spread 1.00%              
Revolving credit facility | Line of credit | Federal funds, effective rate                
Debt Instrument [Line Items]                
Interest rate, basis spread 0.05%              
Revolving credit facility | Line of credit | CIT Finance, LLC syndicate                
Debt Instrument [Line Items]                
Revolving credit facility, maximum borrowing capacity       $ 155,000,000.0 $ 125,000,000.0   $ 125,000,000.0 $ 60,000,000.0
Maximum borrowing capacity not subject to restrictions           $ 110,000,000.0 100,000,000.0  
Revolving credit facility | Line of credit | CIT Finance, LLC syndicate | Accordion feature                
Debt Instrument [Line Items]                
Revolving credit facility, maximum borrowing capacity       $ 25,000,000.0        
Debt instrument, face amount             25,000,000.0 $ 20,000,000.0
Revolving credit facility | Junior subordinated debt | CIT Finance, LLC syndicate                
Debt Instrument [Line Items]                
Contingent commitments         $ 25,000,000.0   25,000,000.0  
Junior event             $ 40,000,000.0  
Scenario, forecast | Revolving credit facility                
Debt Instrument [Line Items]                
Borrowing limit based on appraised forced liquidation of eligible completed and owned drilling rigs   75.00%            
Decrease borrowing limit   1.25%