Lease (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases
Operating leases, right to use assets	$ 198,539
Operating leases, liabilities	$ 213,371		$ 254,381
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