Basis of Presentation - Adoption of New Accounting Standards (Details) - USD ($) $ in Thousands		Oct. 01, 2019	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets - operating leases			$ 178,532	$ 146,000	$ 0
Lease liabilities - operating leases			$ 192,543	178,000	$ 0
Accounting Standards Update 2017-08
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment for adoption of ASU, net of tax	[1]			(583)
Retained Earnings | Accounting Standards Update 2017-08
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment for adoption of ASU, net of tax	[1]			$ (583)
Forecast | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses, effect on capital, phase-in period		3 years
Lower Limit | Forecast | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect on retained earnings, pre-tax		$ 25,000
Effect on allowance for credit loss, percentage		7.00%
Upper Limit | Forecast | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect on retained earnings, pre-tax		$ 60,000
Effect on allowance for credit loss, percentage		16.00%

[1] See "Adoption of New Accounting Standards" in Note 1—“Basis of Presentation” of the “Notes to Interim Consolidated Financial Statements (unaudited)” under Part I, Item 1 of this report for additional details.