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Summary of Quarterly Financial Information (unaudited) (Tables)
 12 Months Ended
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 stockholders
$
9,985

 
$
16,584

 
$
18,806

 
$
17,272

Net income per share attributable to common stockholders:
 
 
 
 
 
 
 
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 stockholders
$
7,428

 
$
11,089

 
$
15,973

 
$
16,966

Net income per share attributable to common stockholders:
 
 
 
 
 
 
 
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 stockholders
$
3,138

 
$
11,120

 
$
11,220

 
$
8,252

Net income per share attributable to common stockholders:
 
 
 
 
 
 
 
Basic and diluted
$
0.03

 
$
0.10

 
$
0.10

 
$
0.07