Leases Leases (Schedule of Maturity of Lease Receivables) (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Leases [Abstract]
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, Remainder of 2019	$ 164,086
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, 2020	182,611
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, 2021	139,036
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, 2022	101,070
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, 2023	70,967
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received, After 2023	121,057
Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received	778,827
Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount	62,724
Sales-type and Direct Financing Leases, Lease Receivable	716,103
Lessor, Operating Lease, Payments to be Received, Remainder of 2019	5,555
Lessor, Operating Lease, Payments to be Received, 2020	7,051
Lessor, Operating Lease, Payments to be Received, 2021	6,994
Lessor, Operating Lease, Payments to be Received, 2022	13,329
Lessor, Operating Lease, Payments to be Received, 2023	5,127
Lessor, Operating Lease, Payments to be Received, After 2023	13,467
Lessor, Operating Lease, Payments to be Received	51,523
Lessor, Total Payments to be Received, Remainder of 2019	169,641
Lessor, Total Payments to be Received, 2020	189,662
Lessor, Total Payments to be Received, 2021	146,030
Lessor, Total Payments to be Received, 2022	114,399
Lessor, Total Payments to be Received, 2023	76,094
Lessor, Total Payments to be Received, After 2023	134,524
Lessor, Total Payments to be Received	$ 830,350