Leasing Arrangements - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 4,701
Operating cash flows from finance leases	9
Financing cash flows from finance leases	352	$ 14	$ 0
Right-of-use assets, net obtained in exchange for new lease obligations:
Operating leases	24,764
Finance leases	$ 71