Revolving Credit Facilities (Details) (USD $)
0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jul. 17, 2013
Line of credit
Jun. 30, 2014
Line of credit
Jun. 30, 2014
Line of credit
Jul. 17, 2013
Line of credit
Minimum
Jul. 17, 2013
Line of credit
Maximum
Jul. 17, 2013
Line of credit
Base Rate
Minimum
Jul. 17, 2013
Line of credit
Base Rate
Maximum
Jul. 17, 2013
Line of credit
LIBOR
Minimum
Jul. 17, 2013
Line of credit
LIBOR
Maximum
Jun. 30, 2014
Revolving Credit Facility
Jul. 17, 2013
Revolving Credit Facility
Jun. 30, 2014
Revolving Credit Facility
Special Purpose Entity
credit_advance
Property
Jun. 30, 2014
Revolving Credit Facility
Deferred Charges And Other Assets
Jun. 30, 2014
Revolving Credit Facility
Weighted Average
Special Purpose Entity
Jun. 30, 2014
Revolving Credit Facility
Prime Rate
Special Purpose Entity
Jun. 30, 2014
Revolving Credit Facility
Floor Rate
Special Purpose Entity
Line of Credit Facility [Line Items]                                    
Line of credit facility maximum borrowing capacity     $ 400,000,000.0                   $ 100,000,000.0          
Extended term of debt     12 months                              
Basis spread on variable rate               1.00% 2.00% 2.00% 3.00%           0.50% 4.00%
Commitment fee on unused capacity           0.25% 0.35%                      
Commitment fee       300,000 600,000                          
Deferred Costs                       4,500,000 4,500,000   3,100,000      
Weighted average effective interest rates                       5.49%            
Interest rate excluding noncash amortization of deferred financing costs and non-utilization fee                       2.78%            
Amount outstanding 15,528,000 35,120,000                   0   15,500,000        
Maximum borrowing capacity increase                           $ 40,000,000        
Term                           24 months        
Number of separate advances                           3        
Number of properties securing borrowings                           3        
Weighted average stated interest rate                               4.00%    
Weighted average interest rate                           4.22%