New accounting pronouncements (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jul. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use asset	$ 136,769
Operating lease liability	$ 135,997
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use asset		$ 126,000
Operating lease liability		$ 126,000