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Summary of Quarterly Financial Information (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information

The quarterly results of operations of our company for the years ended December 31, 2019, 2018 and 2017 are as follows (amounts in thousands):
 
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

 
 
 
 
 
 
 
 
 
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