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Summary of Quarterly Financial Information (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
The quarterly results of operations of our company for the years ended December 31, 2015 and 2014 are as follows (amounts in thousands):
 
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

 
 
 
 
 
 
 
 
 
March 31, 2014
 
June 30, 2014
 
September 30, 2014
 
December 31, 2014
Revenues
$
140,306

 
$
155,168

 
$
169,441

 
$
170,411

Operating income
$
24,088

 
$
42,539

 
$
43,412

 
$
31,282

Net income
$
11,231

 
$
25,281

 
$
22,734

 
$
10,964

Net income attributable to common unitholders
$
11,231

 
$
25,281

 
$
22,493

 
$
10,729

Net income per share attributable to common unitholders:
 
 
 
 
 
 
 
Basic and diluted
$
0.05

 
$
0.10

 
$
0.09

 
$
0.04