Minimum Lease Commitments (Approximate Minimum Annual Gross Rental Payments And Gross Rental Income) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Payments
2018 - Payments	$ 12,791
2019 - Payments	13,011
2020 - Payments	13,534
2021 - Payments	11,721
2022 - Payments	10,856
2023 and thereafter - Payments	104,270
Total minimum future amounts	166,183
Receipts
2018 - Receipts	4,603
2019 - Receipts	3,054
2020 - Receipts	2,327
2021 - Receipts	1,750
2022 - Receipts	1,112
2023 and thereafter - Receipts	785
Total minimum future amounts	$ 13,631