Leases Leases - Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Lease, Cost [Abstract]
Operating Lease, Cost	$ 8,776	$ 8,832	$ 17,272	$ 17,077
Variable Lease, Cost	9	12	24	25
Short-term Lease, Cost	429	102	685	194
Sublease Income	(1,084)	(1,003)	(2,183)	(2,019)
Lease, Cost, Total	$ 8,130	$ 7,943	15,798	15,277
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases			18,450	16,519
ROU assets obtained in exchange for lease obligations:
Operating leases			$ 16,649	$ 14,542