Leases Leases Components of Lease Expense (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	$ 1,103
Variable Lease, Cost	243
Finance Lease, Right-of-Use Asset, Amortization	910
Finance Lease, Interest Expense	699
Operating Lease [Member]
Lessee, Lease, Description [Line Items]
Lease, Cost	1,346
Finance Lease [Member]
Lessee, Lease, Description [Line Items]
Lease, Cost	$ 1,609