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Quarterly Financial Summary (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Summary | Summary financial information by quarter is as follows (dollars in thousands, except per share data):
|  | Quarter |  |  | Total |
2018 |  | First (2) |  |  | Second (3) |  |  | Third |  |  | Fourth (4) |  |  | Year |
Revenue |  | $ | 148,065 |  |  | $ | 142,036 |  |  | $ | 145,690 |  |  | $ | 145,505 |  |  | $ | 581,296 |
Operating income |  |  | 20,529 |  |  |  | 11,303 |  |  |  | 19,283 |  |  |  | 20,183 |  |  | $ | 71,298 |
Net income |  |  | 17,502 |  |  |  | 8,751 |  |  |  | 14,857 |  |  |  | 14,071 |  |  | $ | 55,181 |
Net income per share (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.25 |  |  | $ | 0.13 |  |  | $ | 0.21 |  |  | $ | 0.20 |  |  | $ | 0.79 |
Diluted |  | $ | 0.25 |  |  | $ | 0.12 |  |  | $ | 0.21 |  |  | $ | 0.20 |  |  | $ | 0.77 |
|  | Quarter |  |  | Total |
2017 |  | First |  |  | Second |  |  | Third |  |  | Fourth (5) |  |  | Year |
Revenue |  | $ | 162,109 |  |  | $ | 146,222 |  |  | $ | 144,986 |  |  | $ | 143,118 |  |  | $ | 596,435 |
Operating income |  |  | 9,781 |  |  |  | 9,104 |  |  |  | 4,539 |  |  |  | 10,712 |  |  | $ | 34,136 |
Net income (loss) |  |  | 5,177 |  |  |  | 4,286 |  |  |  | 3,022 |  |  |  | (44,382 | ) |  | $ | (31,897 | )
Net income (loss) per share (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.08 |  |  | $ | 0.06 |  |  | $ | 0.04 |  |  | $ | (0.64 | ) |  | $ | (0.46 | )
Diluted |  | $ | 0.07 |  |  | $ | 0.06 |  |  | $ | 0.04 |  |  | $ | (0.64 | ) |  | $ | (0.46 | )
| (1) | Basic and diluted earnings per share are calculated independently for each of the quarters presented. Accordingly, the sum of the quarterly earnings per share amounts may not agree with the annual earnings per share amount for the corresponding year.
For the year ended December 31, 2018, quarterly results included:
| (2) | First quarter of 2018 net income included a $3.5 million significant legal settlement.
| (3) | Second quarter of 2018 net income included a $6.0 million significant legal settlement.
| (4) | Fourth quarter of 2018 net income included a $5.0 million significant legal settlement.
For the year ended December 31, 2017, quarterly results included:
| (5) | Fourth quarter of 2017 net loss included a $6.5 million significant legal settlement. Fourth quarter 2017 also includes $52.7 million of tax expense related to the impact of the Tax Cuts and Jobs Act which was enacted in the fourth quarter of 2017.

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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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