Leases - Financial Information of The Company's Operating Leases (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Jan. 01, 2019	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2019
Operating lease expense components:
Leases with initial term of greater than 12 months		$ 2,897		$ 5,858
Leases with initial term of 12 months or less		1,413		2,766
Operating lease expense		$ 4,310		8,624
Operating lease assets obtained in exchange for operating lease liabilities:
Non-cash operating lease amounts			$ 5,332	$ 53,053
Accounting Standards Update 2016-02
Operating lease assets obtained in exchange for operating lease liabilities:
Non-cash operating lease amounts	$ 47,721