Leased Assets and Liabilities (Lease Maturity) (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating Leases
Remaining for year ending December 31, 2019	$ 32,088
Year ending December 31, 2020	35,873
Year ending December 31, 2021	28,825
Year ending December 31, 2022	20,484
Year ending December 31, 2023	14,086
Thereafter	57,329
Total	188,685
Less: present value discount	28,593
Lease liability	160,092
Finance Leases
Remaining for year ending December 31, 2019	2,643
Year ending December 31, 2020	2,935
Year ending December 31, 2021	2,543
Year ending December 31, 2022	1,992
Year ending December 31, 2023	1,348
Thereafter	569
Total	12,030
Less: present value discount	1,535
Lease liability	10,495
Total
Remaining for year ending December 31, 2019	34,731
Year ending December 31, 2020	38,808
Year ending December 31, 2021	31,368
Year ending December 31, 2022	22,476
Year ending December 31, 2023	15,434
Thereafter	57,898
Total	200,715
Less: present value discount	30,128
Lease liability	170,587
Lease not yet commenced	$ 2,000

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