Leases - Lease Cost Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Cash paid for amounts included in the measurement of lease liabilities	$ 3,575	$ 7,046
Right-of-use assets obtained in exchange for lease obligations	$ 1,142	$ 1,142