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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The following table sets forth by level, within the fair value hierarchy, estimated fair values on a recurring basis at June 30, 2018 and December 31, 2017 (in thousands):
Assets/(Liabilities) Measured at Fair Value:
Asset/(Liability)
 
Quoted Prices in
Active Markets
for Identical
Assets (Level 1)
 
Significant
Other
Observable
Inputs (Level 2)
 
Significant
Unobservable
Inputs (Level 3)
At June 30, 2018
 
 
 
 
 
 
 
Recurring basis:
 
 
 
 
 
 
 
Interest rate swap derivative instrument
$
1,412

 
$
—

 
$
1,412

 
$
—

Contingent consideration liability
$
(191
)
 
$
—

 
$
—

 
$
(191
)
At December 31, 2017
 
 
 
 
 
 
 
Recurring basis:
 
 
 
 
 
 
 
Interest rate swap derivative instrument
$
479

 
$
—

 
$
479

 
$
—

Contingent consideration liability
$
(191
)
 
$
—

 
$
—

 
$
(191
)