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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information |
|  | 2018 |  |  | 2017 |
|  | 1Q |  |  | 2Q |  |  | 3Q |  |  | 4Q |  |  | 1Q |  |  | 2Q |  |  | 3Q |  |  | 4Q |
Revenue |  | $ | 302,780 |  |  | $ | 324,315 |  |  | $ | 332,968 |  |  | $ | 377,910 |  |  | $ | 296,295 |  |  | $ | 306,392 |  |  | $ | 305,301 |  |  | $ | 321,174 |
Operating income |  | $ | 17,582 |  |  | $ | 21,025 |  |  | $ | 24,222 |  |  | $ | 29,443 |  |  | $ | 16,633 |  |  | $ | 22,208 |  |  | $ | 23,396 |  |  | $ | 20,181 |
Net income |  | $ | 12,417 |  |  | $ | 13,617 |  |  | $ | 16,671 |  |  | $ | 18,695 |  |  | $ | 10,177 |  |  | $ | 11,937 |  |  | $ | 13,692 |  |  | $ | 27,070 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.67 |  |  | $ | 0.72 |  |  | $ | 0.88 |  |  | $ | 0.99 |  |  | $ | 0.54 |  |  | $ | 0.64 |  |  | $ | 0.73 |  |  | $ | 1.45 |
Diluted |  | $ | 0.65 |  |  | $ | 0.71 |  |  | $ | 0.86 |  |  | $ | 0.97 |  |  | $ | 0.52 |  |  | $ | 0.63 |  |  | $ | 0.72 |  |  | $ | 1.41 |
Weighted-average common shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 18,670 |  |  |  | 18,806 |  |  |  | 18,873 |  |  |  | 18,838 |  |  |  | 18,972 |  |  |  | 18,775 |  |  |  | 18,666 |  |  |  | 18,646 |
Diluted |  |  | 19,158 |  |  |  | 19,209 |  |  |  | 19,306 |  |  |  | 19,333 |  |  |  | 19,423 |  |  |  | 19,086 |  |  |  | 19,024 |  |  |  | 19,136 |
Cash dividends declared per common share |  | $ | 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=109225645&loc=d3e1280-108306 + Details
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