New Authoritative Accounting Guidance (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease right of use assets		$ 286,960
Lease liabilities		$ 311,145		$ 3,125
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease right of use assets			$ 216,000
Lease liabilities			241,000
Cumulative effect adjustment to retained earnings			4,414
ASU 2016-02 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings			4,414
ASU 2017-08
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings			(1,446)
ASU 2017-08 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings			$ (1,446)
Scenario, forecast | Minimum | ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in the allowance for credit losses	$ 50,000
Scenario, forecast | Maximum | ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in the allowance for credit losses	$ 70,000