Leases and Right of Use Assets - Components of Lease Expense (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Operating lease costs	$ 2,159
Finance lease costs:
Amortization of assets	2,691
Interest on lease liabilities	546
Total finance lease costs	3,237
Variable and short-term lease costs	561
Total lease cost	$ 5,957