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Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of Quarterly Financial Information
Summarized quarterly data for the years ended December 31, 2017 and 2016 consist of the following (in thousands, except per share amounts):
 
 
Year Ended December 31, 2017
 
 
Q1
 
Q2
 
Q3
 
Q4
Revenues
 
$
605,253

 
$
564,245

 
$
610,506

 
$
663,062

Operating income (loss)
 
29,189

 
16,451

 
26,716

 
21,602

Net income (loss)
 
27,786

 
7,006

 
18,824

 
19,005

 
 
 
 
 
 
 
 
 
Net income (loss) per share
 
 
 
 
 
 
 
 
Basic
 
$
0.60

 
$
0.15

 
$
0.41

 
$
0.41

Diluted
 
$
0.58

 
$
0.15

 
$
0.41

 
$
0.41

 
 
Year Ended December 31, 2016
 
 
Q1
 
Q2
 
Q3
 
Q4
Revenues
 
$
377,812

 
$
413,793

 
$
510,305

 
$
563,136

Operating income (loss)
 
(19,719
)
 
(3,313
)
 
(21,784
)
 
28,325

Net income (loss)
 
(18,673
)
 
(13,088
)
 
(27,761
)
 
13,687

 
 
 
 
 
 
 
 
 
Net income (loss) per share
 
 
 
 
 
 
 
 
Basic
 
$
(0.46
)
 
$
(0.32
)
 
$
(0.67
)
 
$
0.30

Diluted
 
$
(0.46
)
 
$
(0.32
)
 
$
(0.67
)
 
$
0.30