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Stockholders' Equity - Stock Repurchase Program (Details) - USD ($)			3 Months Ended		6 Months Ended
	Mar. 12, 2020	Oct. 23, 2014	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Shares Related to Withholding Taxes on the Vesting of Restricted Stock
Stockholders Equity (Textual) [Abstract]
Number of shares repurchased (in shares)			2,557	2,046	25,803	27,928
Eleventh Stock Repurchase Plan
Stockholders Equity (Textual) [Abstract]
Outstanding share percent		5.00%
Outstanding common shares in the plan (in shares)		1,512,600
Twelfth Stock Repurchase Plan [Member] [Member] [Domain]
Stockholders Equity (Textual) [Abstract]
Outstanding share percent	5.00%
Outstanding common shares in the plan (in shares)	1,799,054
Eleventh Stock Repurchase Plan
Stockholders Equity (Textual) [Abstract]
Number of shares repurchased (in shares)			0	0	0	639,922
Stock Repurchased During Period, Value			$ 0	$ 0	$ 0	$ 23.95
Net Total Stock Repurchased During Periods Presented, Shares					1,512,600
Net Stock Repurchased During Periods Presented, Value Per Share					$ 21.69
Twelfth Stock Repurchase Plan [Member] [Member] [Domain]
Stockholders Equity (Textual) [Abstract]
Number of shares repurchased (in shares)			0	0	0	155,778
Stock Repurchased During Period, Value			$ 0	$ 0	$ 0	$ 20.34
Net Total Stock Repurchased During Periods Presented, Shares					155,778
Net Stock Repurchased During Periods Presented, Value Per Share					$ 20.34

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Stock repurchase program percentage of outstanding shares authorized for repurchase.

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

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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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