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Summary of Quarterly Financial Information (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | The quarterly results of operations of our company for the years ended December 31, 2017, 2016 and 2015 are as follows (amounts in thousands):
| March 31, 2017 |  | June 30, 2017 |  | September 30, 2017 |  | December 31, 2017
Revenues | $ | 164,954 |  |  | $ | 177,124 |  |  | $ | 187,320 |  |  | $ | 183,070 |
Operating income | $ | 36,666 |  |  | $ | 51,434 |  |  | $ | 56,781 |  |  | $ | 50,964 |
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 | $ | 157,074 |  |  | $ | 165,815 |  |  | $ | 175,848 |  |  | $ | 179,263 |
Operating income | $ | 34,114 |  |  | $ | 44,192 |  |  | $ | 53,586 |  |  | $ | 52,651 |
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 |
| March 31, 2015 |  | June 30, 2015 |  | September 30, 2015 |  | December 31, 2015
Revenues | $ | 151,882 |  |  | $ | 164,773 |  |  | $ | 175,779 |  |  | $ | 165,200 |
Operating income | $ | 23,757 |  |  | $ | 45,039 |  |  | $ | 45,343 |  |  | $ | 37,230 |
Net income | $ | 7,888 |  |  | $ | 26,585 |  |  | $ | 26,085 |  |  | $ | 19,370 |
Net income attributable to common unitholders | $ | 7,654 |  |  | $ | 26,351 |  |  | $ | 25,851 |  |  | $ | 19,136 |
Net income per share attributable to common unitholders: |  |  |  |  |  |  |
Basic and diluted | $ | 0.03 |  |  | $ | 0.10 |  |  | $ | 0.10 |  |  | $ | 0.07 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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