Leases - Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash paid related to lease liabilities
Operating cash payments for operating leases	$ 6,790
Investing cash payments for operating leases	13,509
Financing cash payments for financing leases	490	$ 0
Right of use assets obtained in exchange for lease obligations entered into during the period
Operating leases	28,884
Financing leases	$ 471