Leases - Leased Assets and Liabilities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Finance
ROU asset, gross	$ 10,649
Accumulated amortization	(2,919)
Total finance	7,730
Operating
Total operating	405,942
Total leased assets	413,672
Current
Finance	2,056
Operating	64,868
Long-term
Finance	6,366
Operating	344,620
Total lease liabilities	$ 417,910
Weighted-average remaining lease term (in years)
Finance	6 years 4 months 12 days
Operating	11 years 4 months 20 days
Weighted-average discount rate
Finance	6.60%
Operating	7.88%