Leases (Future Minimum Rents Receivable Under Long-Term Non-Cancelable Operating Leases) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Leases [Abstract]
Lessor, Operating Lease, Payments to be Received, Next Twelve Months	$ 161,298	$ 158,252
Lessor, Operating Lease, Payments to be Received, Two Years	139,138	129,740
Lessor, Operating Lease, Payments to be Received, Three Years	120,972	112,111
Lessor, Operating Lease, Payments to be Received, Four Years	93,681	96,964
Lessor, Operating Lease, Payments to be Received, Five Years	52,921	66,864
Lessor, Operating Lease, Payments to be Received, Thereafter	95,453	107,346
Total	$ 663,463	$ 671,277