Leases Leases (Schedule of Maturity of Lease Receivables) (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Leases [Abstract]
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Remainder of 2019	$ 123,242
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, 2020	190,992
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, 2021	148,271
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, 2022	108,230
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, 2023	78,243
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, After 2023	135,256
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received	784,234
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount	63,736
Sales-type and Direct Financing Leases, Lease Receivable	720,498
Lessor, Operating Lease, Payments to be Received, Remainder of 2019	3,779
Lessor, Operating Lease, Payments to be Received, 2020	7,346
Lessor, Operating Lease, Payments to be Received, 2021	7,250
Lessor, Operating Lease, Payments to be Received, 2022	13,557
Lessor, Operating Lease, Payments to be Received, 2023	5,081
Lessor, Operating Lease, Payments to be Received, After 2023	13,084
Lessor, Operating Lease, Payments to be Received	50,097
Lessor, Total Payments to be Received, Remainder of 2019	127,021
Lessor, Total Payments to be Received, 2020	198,338
Lessor, Total Payments to be Received, 2021	155,521
Lessor, Total Payments to be Received, 2022	121,787
Lessor, Total Payments to be Received, 2023	83,324
Lessor, Total Payments to be Received, After 2023	148,340
Lessor, Total Payments to be Received	$ 834,331