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Quarterly Operating Results (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information
 
 
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

Basic earnings per share
 
$
0.04

 
$
0.18

 
$
0.11

 
$
0.12

Diluted earnings per share
 
$
0.04

 
$
0.18

 
$
0.11

 
$
0.12


 
 
2016 Quarter Ended
 
 
March 31
 
June 30
 
September 30
 
December 31
 
 
(In thousands, except per share data)
Total revenue
 
$
213,034

 
$
256,664

 
$
220,239

 
$
206,621

Total operating expenses
 
188,723

 
198,559

 
178,936

 
172,870

Operating income
 
$
24,311

 
$
58,105

 
$
41,303

 
$
33,751

Net income
 
$
16,778

 
$
44,175

 
$
29,937

 
$
23,906

Basic earnings per share
 
$
0.08

 
$
0.22

 
$
0.15

 
$
0.12

Diluted earnings per share
 
$
0.08

 
$
0.22

 
$
0.15

 
$
0.12