Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Operating lease costs	$ 10,279	$ 10,702	$ 21,301	$ 19,599
Financing lease costs:
Amortization of right-of-use assets	153	220	320	477
Interest on lease liabilities	11	30	22	55
Total financing lease costs	164	250	342	532
Variable lease costs	587	846	1,883	2,186
Total lease costs	$ 11,030	$ 11,798	$ 23,526	$ 22,317