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Leases - Lease Cost Finance And Operating Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Operating Lease, Cost [1] $ 5,640 $ 5,054 $ 11,212 $ 10,041
Finance lease cost        
Amortization of leased assets [2] 941 1,332 1,906 2,810
Interest on finance lease obligations 70 90 143 184
Total lease costs $ 6,651 $ 6,476 $ 13,261 $ 13,035
[1] Includes variable lease costs of $0.6 million and $0.5 million for the three months ended June 30, 2020 and 2019, respectively, and $1.2 million and $1.0 million for the six months ended June 30, 2020 and 2019, respectively, and short-term lease costs of $0.2 million for each of the three months ended June 30, 2020 and 2019, respectively, and $0.4 million for each of the six months ended June 30, 2020 and 2019, respectively.
[2] Includes variable lease costs of $0.2 million for each of the three months ended June 30, 2020 and 2019, respectively, and $0.4 million and $0.5 million for the six months ended June 30, 2020 and 2019, respectively.