Leases (Operating Lease Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Long-term fixed lease expense	$ 7,473	$ 8,105
Long-term variable lease expense	124	87
Short-term lease expense	4,423	5,278
Total operating lease expense	$ 12,020	$ 13,470