Leases (Maturity Analysis of Operating and Finance Lease Liabilities) (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating Leases
Remainder of 2019	$ 23,357
2020	28,029
2021	23,359
2022	16,542
2023	10,675
Thereafter	20,548
Total minimum lease payments	122,510
Less: imputed interest	(9,667)
Present value of lease liabilities	112,843
Finance Leases
Remainder of 2019	782
2020	997
2021	977
2022	638
2023	349
Thereafter	3,450
Total minimum lease payments	7,193
Less: imputed interest	(1,660)
Present value of lease liabilities	$ 5,533