Leases - Lease Cost Finance And Operating Leases (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Operating Lease, Cost	[1]	$ 5,572	$ 4,987
Finance lease cost
Amortization of leased assets	[2]	965	1,478
Interest on finance lease obligations		73	94
Total lease costs		$ 6,610	$ 6,559

[1] Includes variable lease costs of $0.6 million and $2.5 million, respectively, and short-term lease costs of $0.2 million and $0.9 million respectively.

[2] Includes variable lease costs of $0.2 million and $0.9 million, respectively