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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]  
Components of Lease Expense
The components of lease expense were as follows:
 
Three months ended 
 June 30,
 
 
Six months ended 
 June 30,
 
(dollars in thousands)
2020

2019

 
2020

2019

Operating lease cost(1)(2)
$
6,281

$
5,894

 
$
12,592

$
11,894

Variable lease cost
1,113

988

 
2,371

1,979

Sublease income
(940
)
(755
)
 
(1,853
)
(1,459
)
Net lease cost
$
6,454

$
6,127

 
$
13,110

$
12,414

(1)
Includes short-term lease costs, which were immaterial.
(2)
See Note 15 for a discussion of the pending purchase of our Headquarters Facility that we currently lease.