Leases - Balance Sheet and Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Leases
Assets Operating	$ 15,059		$ 15,704
Assets Finance	53,441		54,048
Total lease assets	68,500		69,752
Liabilities Current Operating	2,401		2,401
Liabilities Noncurrent Operating	13,601		14,195
Liabilities Noncurrent Finance	59,316		58,435
Total lease liabilities	75,318		$ 75,031
Fixed operating lease cost	938	$ 938
Finance lease cost - amortization of right-of-use asset	607	607
Finance lease cost - interest on lease liability	$ 881	$ 881