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Financial Results by Quarter (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Information
 
 
THREE MONTHS ENDED
(Dollars in thousands, except per share amounts)
MARCH 31
 
JUNE 30
 
SEPTEMBER 30
 
DECEMBER 31
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Revenues
$
134,125

 
$
139,579

 
$
128,747

 
$
143,919

 
$
174,475

 
$
177,215

 
$
137,989

 
$
146,237

Operating income
$
14,027

 
$
31,309

 
$
7,311

 
$
29,725

 
$
27,714

 
$
44,869

 
$
9,855

 
$
26,603

Net income
$
5,656

 
$
20,350

 
$
711

 
$
16,270

 
$
21,798

 
$
33,154

 
$
3,549

 
$
20,136

Net income per share1
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
$
0.14

 
$
0.50

 
$
0.02

 
$
0.40

 
$
0.53

 
$
0.81

 
$
0.09

 
$
0.49

Diluted
$
0.14

 
$
0.50

 
$
0.02

 
$
0.40

 
$
0.53

 
$
0.81

 
$
0.09

 
$
0.49

1  
Per share amounts are computed independently for each of the quarters presented. Therefore, the sum of the quarterly per share amounts may not equal the total computed for the year.