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Stockholders' Equity - Stock Repurchase Program (Details) - $ / shares			12 Months Ended
	Mar. 12, 2020	Oct. 23, 2014	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Stock Repurchased During Period, Value Per Share			$ 23.25
Total Stock Repurchased During Period, Shares			795,700
Eleventh Plan
Class of Stock [Line Items]
Outstanding share, percent		5.00%
Outstanding common shares in the plan		1,513,000
Twelfth Stock Repurchase Plan [Member]
Class of Stock [Line Items]
Outstanding share, percent	5.00%
Outstanding common shares in the plan	1,799,054
Eleventh Plan
Class of Stock [Line Items]
Repurchased shares			639,922	292,712	0
Stock Repurchased During Period, Value Per Share			$ 23.95	$ 26.50
Twelfth Stock Repurchase Plan [Member]
Class of Stock [Line Items]
Repurchased shares			155,778
Stock Repurchased During Period, Value Per Share			$ 20.34

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- Definition

Stock repurchase program percentage of outstanding shares authorized for repurchase.

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Stock Repurchased During Period, Value Per Share

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Total Stock Repurchased During Period, Shares

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Number of shares authorized for issuance under share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

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.

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