Operating Lease Right-of-Use Assets and Liabilities - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	$ 395	$ 118,100
Cash paid for amounts included in the measurement of lease liabilities - operating	$ 8,807	$ 23,841