Significant Accounting Policies (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Operating lease right-of-use assets	$ 378,083	$ 438,700
Operating lease liabilities	488,592	574,500
Financing right-of-use assets	2,504	2,400
Finance lease liabilities	$ 2,535	2,400
Deferred rent		50,000
Restructuring reserve		$ 85,800	$ 85,800