Leases (Maturities of Operating Lease Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
2019 (remainder of year)	$ 8,378
2020	18,661
2021	16,161
2022	12,550
2023	8,286
Thereafter	38,383
Total lease payments	102,419
Less imputed interest	(18,085)
Total	84,334
Current operating lease liabilities, included in accrued liabilities	15,003		$ 0
Long-term operating lease liabilities	$ 69,331	$ 68,939	$ 0
Weighted average remaining lease term - operating leases	10 years 8 months 12 days
Weighted average discount rate - operating leases	3.50%