Lease Assets and Lease Liabilities Lease Assets and Lease Liabilities (Components of Lease Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 3,458	$ 3,909	$ 10,625	$ 11,722
Variable lease cost (1)	1,651	2,319	2,461	6,823
Short-term lease cost	203	254	425	765
Amortization of land rights	3,021	3,020	9,061	15,516
Total lease cost	$ 8,333	$ 9,502	$ 22,572	$ 34,826