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Selected Quarterly Financial Data (unaudited) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Selected Quarterly Financial Data (unaudited) |
14. | SELECTED QUARTERLY FINANCIAL DATA (unaudited)
The following tables set forth selected quarterly statements of income data for the periods indicated (dollars in thousands, except share and per share amounts):
|  | Quarter Ended |
|  | December 31, 2017 |  |  | September 30, 2017 |  |  | June 30, 2017 |  |  | March 31, 2017 |
Revenues |  | $ | 114,025 |  |  | $ | 101,287 |  |  | $ | 98,227 |  |  | $ | 119,508 |
Operating income |  | $ | 19,434 |  |  | $ | 11,437 |  |  | $ | 9,089 |  |  | $ | 38,665 |
Net income |  | $ | 12,905 |  |  | $ | 14,067 |  |  | $ | 14,221 |  |  | $ | 25,614 |
Earnings per share, basic |  | $ | 0.22 |  |  | $ | 0.24 |  |  | $ | 0.24 |  |  | $ | 0.44 |
Earnings per share, diluted |  | $ | 0.22 |  |  | $ | 0.24 |  |  | $ | 0.24 |  |  | $ | 0.43 |
Weighted average shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 58,100,141 |  |  |  | 58,003,222 |  |  |  | 57,898,914 |  |  |  | 57,307,187 |
Diluted |  |  | 58,850,271 |  |  |  | 58,873,502 |  |  |  | 58,816,442 |  |  |  | 58,525,980 |
|  | Quarter Ended |
|  | December 31, 2016 |  |  | September 30, 2016 |  |  | June 30, 2016 |  |  | March 31, 2016 |
Revenues |  | $ | 87,810 |  |  | $ | 77,325 |  |  | $ | 73,880 |  |  | $ | 90,126 |
Operating income |  | $ | 12,681 |  |  | $ | 582 |  |  | $ | 16,004 |  |  | $ | 28,704 |
Net income |  | $ | 8,633 |  |  | $ | 6,198 |  |  | $ | 10,421 |  |  | $ | 18,588 |
Earnings per share, basic |  | $ | 0.15 |  |  | $ | 0.11 |  |  | $ | 0.18 |  |  | $ | 0.32 |
Earnings per share, diluted |  | $ | 0.15 |  |  | $ | 0.10 |  |  | $ | 0.18 |  |  | $ | 0.31 |
Weighted average shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 57,652,531 |  |  |  | 57,819,734 |  |  |  | 57,591,556 |  |  |  | 57,132,909 |
Diluted |  |  | 58,882,966 |  |  |  | 58,907,281 |  |  |  | 58,697,229 |  |  |  | 58,362,040 |

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
Name: | us-gaap_QuarterlyFinancialInformationTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration