Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Senior Secured Revolving Credit Facility) (Details)

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Borrowings (Senior Secured Revolving Credit Facility) (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 0 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Regions Bank [Member]
Jun. 30, 2012
Minimum [Member]
Regions Bank [Member]
Jun. 30, 2012
Maximum [Member]
Regions Bank [Member]
Jun. 30, 2012
Revolving Credit Facility [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Jun. 30, 2012
Revolving Credit Facility [Member]
Regions Bank [Member]
Jun. 20, 2012
Revolving Credit Facility [Member]
Regions Bank [Member]
Jun. 19, 2012
Revolving Credit Facility [Member]
Regions Bank [Member]
Dec. 31, 2011
Revolving Credit Facility [Member]
Regions Bank [Member]
Aug. 08, 2012
Issuance of Debt [Member]
Revolving Credit Facility [Member]
Regions Bank [Member]
Line of Credit Facility [Line Items]                        
Current borrowing capacity                 $ 200,000 $ 60,000 $ 45,000  
Credit Facility 10,000 0       10,000 0          
Interest rate at period end (as a percent)               2.75%        
Minimum borrowing base percentage rate (as a percent)     0.50%                  
Basis Spread on LIBOR (as a percent)       2.50% 3.00%              
Unused capacity, commitment fee (as a percent)     0.50%                  
Line of Credit Facility, Amount Outstanding                       28,000
Line of Credit Facility, Increase, Additional Borrowings                       $ 18,000