Leases Leases - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Lease, Cost [Abstract]
Operating Lease, Cost	$ 8,678	$ 8,950	$ 25,950	$ 26,027
Variable Lease, Cost	18	15	42	40
Short-term Lease, Cost	357	117	1,042	312
Sublease Income	(1,114)	(1,081)	(3,297)	(3,100)
Lease, Cost, Total	$ 7,939	$ 8,001	23,737	23,279
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases			27,386	25,198
ROU assets obtained in exchange for lease obligations:
Operating leases			$ 29,840	$ 19,027