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QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial data (unaudited)
Summarized quarterly financial data is as follows: 
 
Three Months Ended
 
March 31
 
June 30
 
September 30
 
December 31
 
(In thousands; except per share data)
2013:
 
 
 
 
 
 
 
Revenues
$
161,448

 
$
162,499

 
$
176,792

 
$
173,947

Operating income (loss)
5,734

 
11,975

 
8,536

 
(883
)
Net income (loss) applicable to common shareholders
(2,725
)
 
(622
)
 
2,421

 
(5,131
)
Basic income (loss) per common share
$
(0.19
)
 
$
(0.04
)
 
$
0.17

 
$
(0.35
)
2012:
 
 
 
 
 
 
 
Revenues
$
147,236

 
$
132,842

 
$
161,332

 
$
159,027

Operating income (loss)
9,086

 
(4,262
)
 
15,451

 
8,597

Net income (loss) applicable to common shareholders
518

 
(12,423
)
 
7,282

 
(3,963
)
Basic income (loss) per common share
$
0.04

 
$
(0.89
)
 
$
0.52

 
$
(0.28
)