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Line Of Credit (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 10, 2018
Oct. 10, 2017
Jun. 13, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 31, 2018
Line of Credit Facility [Line Items]              
Credit facility principal payment       $ 10,000 $ 0 $ 0  
Revolving Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Credit facility maximum borrowing capacity     $ 300,000        
Credit facility stated percentage     0.00%        
Credit facility accordion feature, increase limit     $ 100,000        
Credit facility borrowings       40,000      
Credit facility amount outstanding       30,000      
Credit facility principal payment   $ 10,000          
Credit facility commitment fees       $ 781 $ 531 $ 483  
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Line of Credit Facility [Line Items]              
Credit facility variable interest rate basis spread (as a percent)     1.00%        
Credit facility description of variable rate basis     London InterBank Offered Rate        
Revolving Credit Facility [Member] | Federal Funds Rate [Member]              
Line of Credit Facility [Line Items]              
Credit facility variable interest rate basis spread (as a percent)     0.50%        
Credit facility description of variable rate basis     Federal Funds Rate        
Minimum [Member] | Revolving Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Credit facility commitment fee per annum on daily unused portion (as a percent)     0.15%        
Minimum [Member] | Revolving Credit Facility [Member] | Base Rate [Member]              
Line of Credit Facility [Line Items]              
Credit facility variable interest rate basis spread (as a percent)     0.25%        
Minimum [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Line of Credit Facility [Line Items]              
Credit facility variable interest rate basis spread (as a percent)     1.25%        
Maximum [Member] | Revolving Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Credit facility commitment fee per annum on daily unused portion (as a percent)     0.30%        
Maximum [Member] | Revolving Credit Facility [Member] | Base Rate [Member]              
Line of Credit Facility [Line Items]              
Credit facility variable interest rate basis spread (as a percent)     1.00%        
Maximum [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Line of Credit Facility [Line Items]              
Credit facility variable interest rate basis spread (as a percent)     2.00%        
Weighted Average [Member] | Revolving Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Credit facility interest rate during the period       2.58%      
Subsequent Event [Member] | Revolving Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Credit facility principal payment $ 10,000            
Credit facility remaining borrowing capacity             $ 280,000