Overview and Summary of Significant Accounting Policies - Stockholders' Equity (Details) - USD ($)	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Accounting Policies [Abstract]
Authorized stock repurchase amount	$ 50,000,000
Number of shares repurchased	56,836
Cost of shares repurchased	$ 2,000,000.0	$ 8,000,000.0
Remaining authorized repurchase amount	$ 34,000,000.0

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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