Leases - Lease Balances (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
Operating	$ 64,606	$ 67,700	$ 0
Finance	5,895		5,002
Total	70,501		5,002
Current Operating Liability	16,709		0
Current Finance Liability	2,465		2,340
Long-term Operating Liability	82,851		0
Long-term Finance Liability	3,534		2,753
Total lease liabilities	$ 105,559		$ 5,093