Leases (Schedule of Future Minimum Payments Under Capital and Operating Leases) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Capital Leases
2019	$ 18,590
2020	20,150
2021	6,471
2022	59
2023	38
Thereafter	0
Total minimum lease payments	45,308
Operating Leases
2019	23,803
2020	22,260
2021	21,473
2022	11,680
2023	4,843
Thereafter	16,952
Total minimum lease payments	101,011
Less amount representing interest (3.76% – 6.00%)	2,760
Present value of minimum lease payments	42,548
Less amount due in one year	16,858	$ 3,164
Total Long-Term Capital Lease Obligation	$ 25,690	$ 8,639
Minimum
Operating Leases
Interest rate	3.76%
Maximum
Operating Leases
Interest rate	6.00%