Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

No definition available.

Name:	us-gaap_FinancialLiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Financial Instruments - Narrative (Details) - Fair value inputs, Level 2 - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Carrying Value \| 6% Senior notes
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure		$ 496,531
Carrying Value \| Five Percent Senior Notes Due Two Thousand Twenty Eight [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	$ 491,654
Fair Value \| 6% Senior notes
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	$ 416,795	$ 522,045