Leases - Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash paid related to lease liabilities
Operating cash payments for operating leases	$ 2,527
Investing cash payments for operating leases	5,300
Financing cash payments for financing leases	274	$ 0
Right of use assets obtained in exchange for lease obligations entered into during the period
Operating leases	1,332
Financing leases	$ 84