Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Jan. 01, 2019	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements
Cumulative Effect of New Accounting Principle in Period of Adoption					$ 7,264
Right-of-use assets, net		$ 514,660
Operating lease liabilities		$ 516,809
Minimum
New Accounting Pronouncements
Discount rate		3.97%
Maximum
New Accounting Pronouncements
Discount rate		5.52%
ASU 2016-01 | Adjustment
New Accounting Pronouncements
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 7,300
Accounting Standards Update 2016-02 | Restatement Adjustment
New Accounting Pronouncements
Right-of-use assets, net			$ 524,000
Operating lease liabilities			$ 524,000
Accounting Standards Update 2016-02 | Proforma Adjustment
New Accounting Pronouncements
Lease expenses	$ 45,000