Summary Of Significant Accounting Policies - New Accounting Standards (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total operating lease liabilities	$ 205,612
Operating lease right-of-use assets	$ 201,118		$ 0
ASC 842
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total operating lease liabilities		$ 259,000
Operating lease right-of-use assets		253,400
ASC 842 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred gain on sale and leaseback transaction		4,600
Tax effect of deferred gain on sale and leaseback transaction		$ 900