Leases - Operating and Finance Lease Liability (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
2019	$ 89,172
2020	104,166
2021	81,568
2022	61,345
2023	40,967
Thereafter	75,891
Total Undiscounted Cash Flows	453,109
Less: Interest	46,550
Finance Lease, Liability, Undiscounted Excess Amount	691
Present Value of Lease Liabilities	406,559
Finance Lease Liabilities, Payments, Due [Abstract]
2019	2,407
2020	2,028
2021	772
2022	74
2023	0
Thereafter	0
Total Undiscounted Cash Flows	5,281
Present Value of Lease Liabilities	4,590
Total
2019	91,579
2020	106,194
2021	82,340
2022	61,419
2023	40,967
Thereafter	75,891
Total Undiscounted Cash Flows	458,390
Less: Interest	47,241
Present Value of Lease Liabilities	$ 411,149