Lease (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
Leases
Operating leases, right to use assets	$ 206,239
Operating leases, liabilities	$ 219,921
Practical expedients, package	false
Practical expedient, hindsight	false
Intangible assets
Leases
Operating leases, right to use assets	$ 2,100
ASU 2016-02
Leases
Operating leases, right to use assets		$ 195,200
Operating leases, liabilities		$ 190,700