Leases (Supplemental Balance Sheet Information) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Leases [Abstract]
Operating lease ROU assets	$ 56,198		$ 80,906
Accrued expenses	19,622		21,072
Operating lease liabilities	38,649		62,354
Total operating lease liabilities	$ 58,271		$ 83,426
Weighted average remaining lease term	8 years		9 years
Weighted average discount rate	6.51%		6.75%
Cash paid for operating leases	$ 20,806	$ 26,242
ROU assets obtained in exchange for lease obligations	$ 3,513	$ 21,045