Leases (Maturity of Lease Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating Lease Liabilities, Payments Due [Abstract]
Remainder of 2019	$ 16,429
2020	28,842
2021	23,152
2022	17,969
2023	14,025
Thereafter	37,420
Total lease payments	137,837
Less: imputed interest	(16,095)
Operating lease liabilities	$ 121,742	$ 0