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Long-Term Debt - Narrative (Details) (USD $)
9 Months Ended 1 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Revolving Credit Facility
2011 Revolving Credit Facility
Apr. 09, 2014
Revolving Credit Facility
2011 Revolving Credit Facility
Sep. 30, 2013
Revolving Credit Facility
2011 Revolving Credit Facility
Jul. 31, 2014
Revolving Credit Facility
2011 Revolving Credit Facility
Subsequent Event [Member]
Apr. 09, 2014
Revolving Credit Facility
2011 Revolving Credit Facility
Eurodollar
Apr. 09, 2014
Revolving Credit Facility
2011 Revolving Credit Facility
Eurodollar
Minimum
Apr. 09, 2014
Revolving Credit Facility
2011 Revolving Credit Facility
Eurodollar
Maximum
Apr. 10, 2014
Revolving Credit Facility
Restatement Agreement
drilling_unit
Apr. 10, 2014
Revolving Credit Facility
Restatement Agreement
Jun. 30, 2014
Revolving Credit Facility
Restatement Agreement
Eurodollar
Jun. 30, 2014
Revolving Credit Facility
Restatement Agreement
Eurodollar
Minimum
Jun. 30, 2014
Revolving Credit Facility
Restatement Agreement
Eurodollar
Maximum
Line of Credit Facility                            
Outstanding credit facility     $ 810,000,000                      
Outstanding letters of credit     8,200,000                      
Maximum borrowing capacity       1,100,000,000.0             1,550,000,000.00      
Credit facility variable rate             Eurodollar         Eurodollar    
Credit facility basis spread on variable rate               2.00% 2.50%       1.75% 2.00%
Commitment fee percentage               0.50% 1.00%       0.30% 0.40%
Market adjustable interest rate (per annum)     2.40% [1]   3.00% [1]                  
Proceeds from credit facility $ 370,000,000 $ 400,000,000       $ 0                
Debt Instrument, Collateral Pledged, Number Of Drilling Units                   9        
[1] After the impact of our interest rate swaps.