Commitments and Contingencies Commitments and Contingencies - Components of Lease Commitments Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Amortization of lease right-of-use assets	$ 8,150	$ 6,487	$ 16,024	$ 12,283
Short-term lease expense	610	1,038	1,171	2,117
Non-lease components (including taxes, insurance, common maintenance, etc.)	2,897	2,175	5,824	3,908
Total operating lease expense, excluding rent	$ 11,657	$ 9,700	$ 23,019	$ 18,308