Leases - Assets and Liabilities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
ROU assets:
Operating lease ROU assets	$ 57,771
Finance lease ROU assets	57,935
Total ROU assets	115,706
Operating lease liabilities:
Current operating lease liabilities	12,051
Noncurrent operating lease liabilities	54,258
Total operating lease liabilities	66,309
Finance lease liabilities:
Current finance lease liabilities	5,105
Noncurrent finance lease liabilities	33,979
Total finance lease liabilities	$ 39,084