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Quarterly Operating Results (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information
 
 
2018 Quarter Ended
 
 
March 31
 
June 30
 
September 30
 
December 31
 
 
(In thousands, except per share data)
Total revenue
 
$
181,530

 
$
237,949

 
$
220,818

 
$
223,407

Total operating expenses
 
168,011

 
200,012

 
176,589

 
189,031

Operating income
 
$
13,519

 
$
37,937

 
$
44,229

 
$
34,376

Net income
 
$
4,338

 
$
28,009

 
$
31,443

 
$
24,006

Net income attributable to common stockholders
 
$
4,338

 
$
28,009

 
$
31,443

 
$
23,994

Net income per share available to common stockholders—basic
 
$
0.02

 
$
0.14

 
$
0.15

 
$
0.12

Net income per share available to common stockholders—diluted
 
$
0.02

 
$
0.14

 
$
0.15

 
$
0.12


 
 
2017 Quarter Ended
 
 
March 31
 
June 30
 
September 30
 
December 31
 
 
(In thousands, except per share data)
Total revenue
 
$
196,210

 
$
243,272

 
$
223,486

 
$
207,037

Total operating expenses
 
176,914

 
192,621

 
189,168

 
171,519

Operating income
 
$
19,296

 
$
50,651

 
$
34,318

 
$
35,518

Net income
 
$
8,887

 
$
36,595

 
$
21,623

 
$
24,772

Net income attributable to common stockholders
 
$
8,887

 
$
36,595

 
$
21,623

 
$
24,772

Net income per share available to common stockholders—basic
 
$
0.04

 
$
0.18

 
$
0.11

 
$
0.12

Net income per share available to common stockholders—diluted
 
$
0.04

 
$
0.18

 
$
0.11

 
$
0.12