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Quarterly Results (unaudited) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Results (unaudited) | Quarterly Results (unaudited) The following table reflects selected quarterly results for the Company.
| Three Months Ended
(in thousands, except per share data) | March 31, 2019 |  | June 30, 2019 |  | September 30, 2019 |  | December 31, 2019
Revenue | $ | 158,843 |  |  | $ | 158,914 |  |  | $ | 155,152 |  |  | $ | 160,997 |
Operating income | 24,787 |  |  | 24,020 |  |  | 25,359 |  |  | 22,880 |
Net income | 13,910 |  |  | 13,150 |  |  | 14,354 |  |  | 13,521 |
Net income per share - basic | $ | 0.28 |  |  | $ | 0.26 |  |  | $ | 0.29 |  |  | $ | 0.27 |
Net income per share - diluted | $ | 0.28 |  |  | $ | 0.26 |  |  | $ | 0.29 |  |  | $ | 0.27 |
| Three Months Ended
(in thousands except per share data) | March 31, 2018 |  | June 30, 2018 |  | September 30, 2018 |  | December 31, 2018
Revenue | $ | 154,138 |  |  | $ | 156,501 |  |  | $ | 158,731 |  |  | $ | 161,484 |
Operating income | 16,754 |  |  | 21,169 |  |  | 28,329 |  |  | 26,994 |
Net income | 6,583 |  |  | 9,626 |  |  | 15,534 |  |  | 14,852 |
Net income per share - basic | $ | 0.13 |  |  | $ | 0.19 |  |  | $ | 0.31 |  |  | $ | 0.31 |
Net income per share - diluted | $ | 0.13 |  |  | $ | 0.19 |  |  | $ | 0.31 |  |  | $ | 0.30 |

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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