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Credit Facility (Details) (Credit facility., USD $)
3 Months Ended
Mar. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Aug. 14, 2014
Credit Facility        
Maximum borrowing capacity   $ 47,500,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity $ 50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity $ 55,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Percentage points added to the reference rate 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1      
Outstanding borrowings 38,000,000us-gaap_LineOfCredit   39,010,000us-gaap_LineOfCredit  
Weighted average interest rate on the amount outstanding (as a percent) 3.18%us-gaap_LongtermDebtWeightedAverageInterestRate      
Amount available for borrowing pursuant to the facility $ 12,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity      
Minimum
       
Credit Facility        
Percentage points added to the reference rate 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
     
Maximum
       
Credit Facility        
Percentage points added to the reference rate 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember