Leases (Summary of Lease Assets and Liabilities) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Assets
Operating lease assets	$ 170,056
Finance lease assets	15,713
Total lease assets	185,769
Liabilities
Current operating lease liabilities	30,171
Current finance lease liabilities	3,788
Total current lease liabilities	33,959
Noncurrent operating lease liabilities	193,570
Noncurrent finance lease liabilities	17,477
Total noncurrent lease liabilities	211,047
Total lease liabilities	$ 245,006