Leases (Supplemental Balance Sheet Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Leases [Abstract]
Operating lease ROU assets	$ 76,533		$ 80,906
Accrued expenses	20,509		21,072
Operating lease liabilities	57,948		62,354
Total operating lease liabilities	$ 78,457		$ 83,426
Weighted average remaining lease term	9 years		9 years
Weighted average discount rate	6.75%		6.75%
Cash paid for operating leases	$ 7,757	$ 8,742
ROU assets obtained in exchange for lease obligations	$ 1,465	$ 6,877