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Summary of Quarterly Financial Information (unaudited) | 12 Months Ended
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Dec. 31, 2018
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, 2018, 2017 and 2016 are as follows (amounts in thousands):
| 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 |
| March 31, 2017 |  | June 30, 2017 |  | September 30, 2017 |  | December 31, 2017
Revenues | $ | 164,333 |  |  | $ | 176,349 |  |  | $ | 186,547 |  |  | $ | 182,297 |
Operating income | $ | 36,045 |  |  | $ | 50,659 |  |  | $ | 56,008 |  |  | $ | 50,191 |
Net income | $ | 19,145 |  |  | $ | 31,359 |  |  | $ | 35,489 |  |  | $ | 32,260 |
Net income attributable to common unitholders | $ | 18,911 |  |  | $ | 31,125 |  |  | $ | 35,255 |  |  | $ | 32,026 |
Net income per share attributable to common unitholders: |  |  |  |  |  |  |
Basic and diluted | $ | 0.06 |  |  | $ | 0.10 |  |  | $ | 0.12 |  |  | $ | 0.11 |
| March 31, 2016 |  | June 30, 2016 |  | September 30, 2016 |  | December 31, 2016
Revenues | $ | 157,057 |  |  | $ | 165,785 |  |  | $ | 175,704 |  |  | $ | 178,807 |
Operating income | $ | 34,097 |  |  | $ | 44,162 |  |  | $ | 53,442 |  |  | $ | 52,195 |
Net income | $ | 16,705 |  |  | $ | 24,640 |  |  | $ | 32,897 |  |  | $ | 33,008 |
Net income attributable to common unitholders | $ | 16,471 |  |  | $ | 24,406 |  |  | $ | 32,663 |  |  | $ | 32,774 |
Net income per share attributable to common unitholders: |  |  |  |  |  |  |
Basic and diluted | $ | 0.06 |  |  | $ | 0.09 |  |  | $ | 0.12 |  |  | $ | 0.11 |

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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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