Commitments and Contingencies Commitments and Contingencies - Components of Lease Commitments Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Amortization of lease right-of-use assets	$ 8,129	$ 8,150	$ 16,412	$ 16,024
Short-term lease expense	530	610	734	1,171
Non-lease components (including taxes, insurance, common maintenance, etc.)	2,337	2,897	5,341	5,824
Total operating lease expense, excluding rent	$ 10,996	$ 11,657	$ 22,487	$ 23,019