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QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2015
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 (1)
 
(In thousands; except per share data)
2015:
 
 
 
 
 
 
 
Revenues
$
371,483

 
$
348,959

 
$
349,796

 
$
340,810

Operating income (loss)
8,455

 
(6,866
)
 
(15,307
)
 
(118,623
)
Net loss applicable to common shareholders
(11,732
)
 
(36,605
)
 
(46,562
)
 
(108,418
)
Basic loss per common share
$
(0.67
)
 
$
(2.04
)
 
$
(2.59
)
 
$
(6.00
)
2014:
 
 
 
 
 
 
 
Revenues
$
180,202

 
$
287,956

 
$
337,830

 
$
310,004

Operating income (loss)
8,053

 
(29,640
)
 
(29,432
)
 
8,044

Net loss applicable to common shareholders
(19,291
)
 
(63,363
)
 
(49,329
)
 
(41,135
)
Basic loss per common share
$
(1.30
)
 
$
(4.19
)
 
$
(2.95
)
 
$
(2.41
)