Commitments and Contingencies Commitments and Contingencies - Components of Lease Commitments Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Amortization of lease right-of-use assets	$ 8,172	$ 8,521	$ 24,584	$ 24,545
Short-term lease expense	384	172	1,118	1,343
Non-lease components (including taxes, insurance, common maintenance, etc.)	2,864	2,586	8,205	8,410
Total operating lease expense, excluding rent	$ 11,420	$ 11,279	$ 33,907	$ 34,298