Leases (Maturity Analysis of Lease Liabilities) (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating Leases
2019 (excluding the three months ended March 31, 2019)	$ 31,076
2020	21,688
2021	16,289
2022	9,927
2023	5,793
Thereafter	8,688
Total lease payments	93,461
Less interest	7,993
Total	85,468
Finance Leases
2019 (excluding the three months ended March 31, 2019)	6,293
2020	2,333
2021	2,334
2022	2,341
2023	2,342
Thereafter	18,331
Total lease payments	33,974
Less interest	4,909
Total	29,065
Total
2019 (excluding the three months ended March 31, 2019)	37,369
2020	24,021
2021	18,623
2022	12,268
2023	8,135
Thereafter	27,019
Total lease payments	127,435
Less interest	12,902
Total lease liabilities	$ 114,533