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Senior Revolving Credit Facility (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2012
Jul. 20, 2012
RBS Citizens, N.A. [Member]
Above Threshold [Member]
Jul. 20, 2012
RBS Citizens, N.A. [Member]
Below Threshold [Member]
Jul. 20, 2012
RBS Citizens, N.A. [Member]
Revolving Credit Facility [Member]
Dec. 31, 2012
RBS Citizens, N.A. [Member]
Revolving Credit Facility [Member]
Maximum [Member]
Jul. 20, 2012
RBS Citizens, N.A. [Member]
Revolving Credit Facility [Member]
Maximum [Member]
Jul. 20, 2012
Issuance of Debt [Member]
Revolving Credit Facility [Member]
Jul. 20, 2012
LIBOR [Member]
Issuance of Debt [Member]
RBS Citizens, N.A. [Member]
Revolving Credit Facility [Member]
Option One [Member]
Minimum [Member]
Jul. 20, 2012
LIBOR [Member]
Issuance of Debt [Member]
RBS Citizens, N.A. [Member]
Revolving Credit Facility [Member]
Option One [Member]
Maximum [Member]
Jul. 20, 2012
RBS Citizens, N.A. Publicly Announced Base Rate [Member]
Issuance of Debt [Member]
RBS Citizens, N.A. [Member]
Revolving Credit Facility [Member]
Option Two [Member]
Minimum [Member]
Jul. 20, 2012
RBS Citizens, N.A. Publicly Announced Base Rate [Member]
Issuance of Debt [Member]
RBS Citizens, N.A. [Member]
Revolving Credit Facility [Member]
Option Two [Member]
Maximum [Member]
Jul. 20, 2012
Federal Funds Effective Rate [Member]
RBS Citizens, N.A. [Member]
Revolving Credit Facility [Member]
Line of Credit Facility, Base Rate, Option Two [Member]
Maximum capacity on credit facility             $ 100,000,000          
Line of Credit Facility, Additional Borrowing Capacity, Accordion Feature           250,000,000            
Term of credit facility       36 months                
Line of credit, length of extension option       12 months                
Debt Instrument, Basis Spread on Variable Rate               2.10% 3.50% 2.50% 3.00% 1.00%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.25% 0.15%                  
Line of Credit Facility, Commitment Fee Percentage, Threshold, Unused Capacity as a Percentage of Current Capacity         50.00%              
Debt Instrument, Unused Borrowing Capacity, Fee $ 96,000