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Selected Quarterly Data (Unaudited)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Data [Abstract]  
Selected Quarterly Data (Unaudited)
Selected Quarterly Data (Unaudited)

 
 
2015 Quarter Ended
 
2014 Quarter Ended
In thousands, except per share amounts
 
December 31
 
September 30
 
June 30
 
March 31
 
December 31
 
September 30
 
June 30
 
March 31
Revenues
 
$
129,815

 
$
121,968

 
$
122,345

 
$
121,173

 
$
146,518

 
$
134,121

 
$
140,310

 
$
132,727

Operating income (loss)
 
6,792

 
(205,438
)
 
8,057

 
3,015

 
14,656

 
10,540

 
10,987

 
4,579

Net income (loss)
 
2,543

 
(170,914
)
 
(4,172
)
 
1,615

 
10,089

 
6,420

 
5,637

 
1,845

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic earnings (loss) per share
 
$
0.04

 
$
(2.77
)
 
$
(0.07
)
 
$
0.03

 
$
0.16

 
$
0.10

 
$
0.09

 
$
0.03

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Diluted earnings (loss) per share
 
$
0.04

 
$
(2.77
)
 
$
(0.07
)
 
$
0.03

 
$
0.16

 
$
0.10

 
$
0.09

 
$
0.03


 
Earnings per common share amounts are computed independently for each of the quarters presented. Therefore, the sum of the quarterly earnings per share amounts may not equal the quarterly earnings per share amounts or the annual earnings per share amounts.