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Stockholders' Equity - Stock Repurchase Program (Details) - $ / shares |  |  | 3 Months Ended | 9 Months Ended | 19 Months Ended | 83 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 12, 2020 | Oct. 23, 2014 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2021
Shares Related to Withholding Taxes on the Vesting of Restricted Stock |  |  |  |  |  |  |  |
Stockholders Equity (Textual) [Abstract] |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  |  | 220 | 378 | 26,023 | 28,306 |  |
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 |  |  |  |  |  |  |  |
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 |  |
Net Total Stock Repurchased During Periods Presented, Shares |  |  |  |  |  |  |  | 1,512,600
Net Stock Repurchased During Periods Presented, Value Per Share |  |  | $ 0 | $ 0 | $ 0 | $ 23.95 |  | $ 21.69
Twelfth Stock Repurchase Plan |  |  |  |  |  |  |  |
Stockholders Equity (Textual) [Abstract] |  |  |  |  |  |  |  |
Number of shares repurchased (in shares) |  |  | 841,088 | 0 | 841,088 | 155,778 |  |
Net Total Stock Repurchased During Periods Presented, Shares |  |  |  |  |  |  | 996,866 |
Net Stock Repurchased During Periods Presented, Value Per Share |  |  | $ 24.54 | $ 0 | $ 24.54 | $ 20.34 | $ 23.88 |

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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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