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Fair Value (Tables)
 12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation
The following is a rollforward of deferred acquisition costs in 2017 and 2018.
 
(in thousands)
 
2015

Acquisition
 
 
Total Deferred

Acquisition Cost

Payable
 
Balance at January 1, 2016
 
$
789
 
 
$
789
 
Payments
 
 
(789
)
 
 
(789
)
Total adjustments included in earnings
 
 
—
 
 
 
—
 
Balance at December 31, 2018, 2017 and 2016
 
$
—
 
 
$
—