Leases (Supplemental Balance Sheet Information) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating lease ROU assets	$ 99,004
Accrued expenses	26,959
Operating lease liabilities	78,973
Total operating lease liabilities	105,932
Cash paid for operating leases	17,435
ROU assets obtained in exchange for lease obligations	$ 16,150
Weighted average remaining lease term	9 years
Weighted average discount rate	6.75%