Significant Accounting Policies (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Right-of-use assets	$ 397,187	$ 438,700
Operating lease liabilities	513,875	574,500
Financing right-of-use assets	1,779	2,400
Finance lease liabilities	$ 1,789	2,400
Deferred rent		50,000
Restructuring reserve		$ 85,800	$ 85,800