Leases - Balance sheet locations and values of the Company's lease assets and lease liabilities (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating lease assets	$ 298,393
Finance lease assets	34,858
Total lease assets	333,251
Current operating lease liabilities	54,048
Current finance lease liabilities	10,803
Total current lease liabilities	64,851
Noncurrent operating lease liabilities	253,992
Noncurrent finance lease liabilities	22,274
Total noncurrent lease liabilities	276,266
Total lease liabilities	$ 341,117