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Lines Of Credit (Details) - Revolving Credit Facility [Member] - USD ($)
$ in Thousands
 12 Months Ended
Jun. 13, 2016
Feb. 02, 2012
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]          
Commitment fees related to credit facility     $ 531 $ 483 $ 458
London Interbank Offered Rate (LIBOR) [Member]          
Line of Credit Facility [Line Items]          
Credit facility variable interest rate basis spread (as a percent) 1.00%        
2016 Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Credit facility maximum borrowing capacity $ 300,000        
Credit facility stated percentage 0.00%        
Credit facilty accordian feature, increase limit $ 100,000        
2016 Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Line of Credit Facility [Line Items]          
Credit facility description of variable rate basis London InterBank Offered Rate        
2016 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        
2012 Credit Facility [Member]          
Line of Credit Facility [Line Items]          
Credit facility maximum borrowing capacity   $ 300,000      
Credit facility commitment fee per annum on daily unused portion (as a percent)   0.15%      
Minimum [Member] | 2016 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] | 2016 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] | 2016 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] | 2016 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] | 2016 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] | 2016 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%