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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Carrying Value and Estimated Fair Value of Financial Instruments
The carrying value and estimated fair value of our Level 2 and 3 financial instruments are as follows (in thousands):
 
 
 
June 30, 2018
 
December 31, 2017
 
Level in Fair Value Hierarchy
 
Carrying Value
 
Estimated Fair Value
 
Carrying Value
 
Estimated Fair Value
Description:
 
 
 
 
 
 
 
 
 
Revolving credit facility
2
 
$
42,500

 
$
42,500

 
$
32,000

 
$
32,000

Unsecured revolving credit facility
2
 
$
125,000

 
$
125,000

 
$
75,000

 
$
75,000

Notes payable
2
 
$
1,205

 
$
1,205

 
$
9,926

 
$
9,926

Contingent consideration liability
3
 
$
628

 
$
628

 
$
—

 
$
—