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Stockholders' Equity - Stock Repurchase Program (Details) - $ / shares |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 12, 2020 | Oct. 23, 2014 | Mar. 31, 2021 | Mar. 31, 2020
Class of Stock [Line Items] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  | 15,538 | 21,475
Eleventh Stock Repurchase Plan |  |  |  |
Stockholders Equity (Textual) [Abstract] |  |  |  |
Outstanding share percent |  | 5.00% |  |
Outstanding common shares in the plan (in shares) |  | 1,513,000 |  |
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 | 639,922
Stock Repurchased During Period, Value Per Share |  |  | $ 0 | $ 23.95
Twelfth Stock Repurchase Plan [Member] [Member] [Domain] |  |  |  |
Stockholders Equity (Textual) [Abstract] |  |  |  |
Number of shares repurchased (in shares) |  |  | 0 | 155,778
Net Stock Repurchased During Periods Presented, Value Per Share |  |  | $ 20.34 |
Stock Repurchased During Period, Value Per Share |  |  | $ 0 | $ 20.34
Net Total Stock Repurchased During Periods Presented, Shares |  |  | 155,778 |
Eleventh Stock Repurchase Plan [Member] |  |  |  |
Stockholders Equity (Textual) [Abstract] |  |  |  |
Net Stock Repurchased During Periods Presented, Value Per Share |  |  | $ 21.69 |
Net Total Stock Repurchased During Periods Presented, Shares |  |  | 1,512,600 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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