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Notes Payable (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Payable [Abstract]  
Summary of Credit Agreement and Notes Payable
Notes payable as of December 31, 2017 and 2016 consisted of the following (dollars in thousands):

  
December 31, 2017
  
December 31, 2016
 
Credit Agreement average effective interest rate of 3.6% inclusive of unused fee
 
$
54,000
  
$
46,000
 
Various notes payable with $4,044 plus accrued interest due in the next year, interest accrues in the range of 3.25% through 4.25% per annum
  
6,772
   
5,823
 
   
60,772
   
51,823
 
Less current portion
  
(4,044
)
  
(1,227
)
Long term portion
 
$
56,728
  
$
50,596
 
Summary of Aggregate Annual Payments of Principal Required to Revolving Credit Facility
Aggregate annual payments of principal required pursuant to the Credit Agreement and the various notes payable subsequent to December 31, 2017 are as follows (in thousands):

During the twelve months ended December 31, 2018
 
$
4,044
 
During the twelve months ended December 31, 2019
  
2,728
 
During the twelve months ended December 31, 2020
  
-
 
During the twelve months ended December 31, 2021
  
54,000
 
  
$
60,772