Leases (Other Information) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Operating Leases:
ROU assets recorded under operating leases	$ 208,045
Accumulated amortization associated with operating leases	(9,389)
Total operating leases ROU assets, net	198,656
Operating lease liabilities	37,807
Liabilities recorded under operating leases (non-current)	160,315
Total operating leases liabilities	198,122
Operating lease expense	15,209
Variable lease expense	1,575
Total operating lease expense	16,784
Finance Leases:
ROU assets recorded under finance leases	15,339
Accumulated depreciation associated with finance leases	(7,229)
Total finance leases ROU assets, net	8,110
Total finance lease liabilities	8,080
Amortization of finance lease ROU assets	1,157
Interest on lease liabilities	78
Total finance lease expense	$ 1,235