Leases - Cash Flow (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash paid for amounts included in the measurement of liabilities
Financing cash flows from finance leases	$ 819	$ 996
Operating cash flows from finance leases	322	245
Operating cash flows from operating leases	51,179	46,044
Non-cash supplemental amounts
ROU assets obtained in exchange for new finance lease liabilities	1,915	192
ROU assets obtained in exchange for new operating lease liabilities	4,557	14,308
ROU assets terminated in exchange for release from operating lease liabilities	$ 7,738	$ 193