Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Equity - Share Repurchase Program (Details) - USD ($)	12 Months Ended
Equity - Share Repurchase Program (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	May 06, 2019	May 03, 2018
The 2018 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Value of stock authorized for repurchase under stock repurchase program (up to)				$ 200,000,000.0
Repurchase of common stock (shares)	0
Repurchases of common stock under the Share Repurchase Program (shares)		800,000
Repurchases of common stock under the share repurchase program weighted average price per share (USD per share)		$ 6.95
Repurchases of common stock under the Share Repurchase Program		$ 5,600,000
The 2019 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Value of stock authorized for repurchase under stock repurchase program (up to)	$ 200,000,000.0		$ 200,000,000.0
Repurchase of common stock (shares)	0