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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information |
|  | 2020 | 2019 |
|  | 1Q |  |  | 2Q |  |  | 3Q |  |  | 4Q |  |  | 1Q |  |  | 2Q |  |  | 3Q |  |  | 4Q |
Revenue |  | $ | 358,238 |  |  | $ | 353,987 |  |  | $ | 360,315 |  |  | $ | 434,335 |  |  | $ | 341,254 |  |  | $ | 366,717 |  |  | $ | 373,918 |  |  | $ | 396,636 |
Operating income |  | $ | 16,319 |  |  | $ | 22,782 |  |  | $ | 28,250 |  |  | $ | 21,758 |  |  | $ | 21,889 |  |  | $ | 22,542 |  |  | $ | 28,664 |  |  | $ | 28,298 |
Net income |  | $ | 10,612 |  |  | $ | 13,656 |  |  | $ | 17,871 |  |  | $ | 12,820 |  |  | $ | 15,318 |  |  | $ | 14,611 |  |  | $ | 19,630 |  |  | $ | 19,379 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.56 |  |  | $ | 0.73 |  |  | $ | 0.95 |  |  | $ | 0.68 |  |  | $ | 0.81 |  |  | $ | 0.78 |  |  | $ | 1.04 |  |  | $ | 1.03 |
Diluted |  | $ | 0.55 |  |  | $ | 0.72 |  |  | $ | 0.94 |  |  | $ | 0.67 |  |  | $ | 0.80 |  |  | $ | 0.76 |  |  | $ | 1.02 |  |  | $ | 1.01 |
Weighted-average common shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 18,840 |  |  |  | 18,829 |  |  |  | 18,853 |  |  |  | 18,841 |  |  |  | 18,825 |  |  |  | 18,805 |  |  |  | 18,799 |  |  |  | 18,834 |
Diluted |  |  | 19,197 |  |  |  | 19,020 |  |  |  | 19,086 |  |  |  | 19,143 |  |  |  | 19,263 |  |  |  | 19,133 |  |  |  | 19,169 |  |  |  | 19,234 |
Cash dividends declared per common share |  | $ | 0.14 |  |  | $ | 0.14 |  |  | $ | 0.14 |  |  | $ | 0.14 |  |  | $ | 0.14 |  |  | $ | 0.14 |  |  | $ | 0.14 |  |  | $ | 0.14 |

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- References No definition available. + Details
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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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