Leases (Maturities of Operating Lease Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
2019 (remainder of year)	$ 3,256
2020	18,803
2021	16,426
2022	12,890
2023	8,574
Thereafter	38,398
Total lease payments	98,347
Less imputed interest	(17,204)
Total	81,143
Current operating lease liabilities, included in accrued liabilities	14,802		$ 0
Long-term operating lease liabilities	$ 66,341	$ 68,939	$ 0
Weighted average remaining lease term - operating leases	10 years 8 months 12 days
Weighted average discount rate - operating leases	3.30%