Commitments and Contingencies Commitments and Contingencies - Components of Lease Commitments Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Amortization of lease right-of-use assets	$ 8,521	$ 7,415	$ 24,545	$ 19,698
Short-term lease expense	172	1,199	1,343	3,316
Non-lease components (including taxes, insurance, common maintenance, etc.)	2,586	3,114	8,410	7,022
Total operating lease expense, excluding rent	$ 11,279	$ 11,728	$ 34,298	$ 30,036