Leases - Lessee Disclosure, Balance Sheet Disclosure (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Assets:
Operating lease assets	$ 180,645
Total lease assets	180,645	$ 184,648
Current
Operating	19,733	20,318	$ 0
Noncurrent
Operating	172,090	170,190
Lease Liabilities	$ 191,823	$ 190,508