v3.7.0.1
Note Payable Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Oct. 31, 2014
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Debt Instrument [Line Items]        
Deferred financing costs   $ 4,100,000   $ 4,300,000
Repayments of notes payable   $ 25,625,000 $ 5,625,000  
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 225,000,000.0      
Potential maximum borrowing capacity increase 50,000,000.0      
Effective interest rate (percent)   3.90%    
Interest expense   $ 1,200,000 1,100,000  
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Line of Credit [Member] | Base Rate, Condition One [Member]        
Debt Instrument [Line Items]        
Spread on interest rate (percent)   0.50%    
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Line of Credit [Member] | Base Rate, Condition Two [Member]        
Debt Instrument [Line Items]        
Spread on interest rate (percent)   1.00%    
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Line of Credit [Member] | LIBOR [Member]        
Debt Instrument [Line Items]        
Description of variable rate basis   one-month LIBOR    
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Minimum [Member] | Line of Credit [Member] | LIBOR [Member]        
Debt Instrument [Line Items]        
Basis spread on variable rate (percent)   2.50%    
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Minimum [Member] | Line of Credit [Member] | Base Rate [Member]        
Debt Instrument [Line Items]        
Basis spread on variable rate (percent)   1.50%    
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Maximum [Member] | Line of Credit [Member] | LIBOR [Member]        
Debt Instrument [Line Items]        
Basis spread on variable rate (percent)   3.00%    
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Maximum [Member] | Line of Credit [Member] | Base Rate [Member]        
Debt Instrument [Line Items]        
Basis spread on variable rate (percent)   2.00%    
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Revolving Facility [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 75,000,000.0      
Debt term 5 years      
Bank Of America, N.A., Wells Fargo Bank, National Association, And Other Lenders [Member] | Term Facility [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 150,000,000.0      
Debt term 5 years      
Quarterly principal payment   $ 5,600,000    
Repayments of notes payable   $ 5,600,000 $ 5,600,000