Leases - Right-of-use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Right-of-use assets	$ 112,156	$ 94,200
Lease liabilities	$ 131,800	$ 118,900
Weighted average remaining lease term	7 years 11 months 12 days
Weighted average discount rate	3.14%