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Summary of Quarterly Financial Information (unaudited) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Summary of Quarterly Financial Information (unaudited) | Summary of Quarterly Financial Information (unaudited) The quarterly results of operations of our company for the years ended December 31, 2020, 2019 and 2018 are as follows (amounts in thousands):
| March 31, 2020 |  | June 30, 2020 |  | September 30, 2020 |  | December 31, 2020
Revenues | $ | 170,224 |  |  | $ | 141,030 |  |  | $ | 146,575 |  |  | $ | 151,399 |
Operating income | $ | 26,973 |  |  | $ | 334 |  |  | $ | 11,928 |  |  | $ | 19,426 |
Net income (loss) | $ | 8,288 |  |  | $ | (19,618) |  |  | $ | (12,269) |  |  | $ | 710 |
Net income (loss) attributable to common stockholders | $ | 7,238 |  |  | $ | (20,665) |  |  | $ | (13,319) |  |  | $ | (340) |
Net income (loss) per share attributable to common stockholders: |  |  |  |  |  |  |
Basic and diluted | $ | 0.02 |  |  | $ | (0.07) |  |  | $ | (0.05) |  |  | $0.00
| March 31, 2019 |  | June 30, 2019 |  | September 30, 2019 |  | December 31, 2019
Revenues | $ | 167,293 |  |  | $ | 176,244 |  |  | $ | 192,873 |  |  | $ | 194,933 |
Operating income | $ | 26,076 |  |  | $ | 36,239 |  |  | $ | 45,279 |  |  | $ | 47,112 |
Net income | $ | 9,856 |  |  | $ | 18,930 |  |  | $ | 26,784 |  |  | $ | 28,720 |
Net income attributable to common unitholders | $ | 9,622 |  |  | $ | 18,696 |  |  | $ | 26,550 |  |  | $ | 27,679 |
Net income per share attributable to common unitholders: |  |  |  |  |  |  |
Basic and diluted | $ | 0.03 |  |  | $ | 0.06 |  |  | $ | 0.09 |  |  | $ | 0.09 |
| March 31, 2018 |  | June 30, 2018 |  | September 30, 2018 |  | December 31, 2018
Revenues | $ | 167,271 |  |  | $ | 178,529 |  |  | $ | 186,402 |  |  | $ | 199,309 |
Operating income | $ | 34,164 |  |  | $ | 49,665 |  |  | $ | 48,538 |  |  | $ | 58,490 |
Net income | $ | 18,058 |  |  | $ | 30,184 |  |  | $ | 29,230 |  |  | $ | 39,781 |
Net income attributable to common unitholders | $ | 17,824 |  |  | $ | 29,950 |  |  | $ | 28,996 |  |  | $ | 39,547 |
Net income per share attributable to common unitholders: |  |  |  |  |  |  |
Basic and diluted | $ | 0.06 |  |  | $ | 0.10 |  |  | $ | 0.10 |  |  | $ | 0.13 |

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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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