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COMMON STOCK AND PREFERRED STOCK (Tables)
 12 Months Ended
Dec. 31, 2013
Equity [Abstract]  
Summary of Changes in Common Stock Issued and Treasury Stock
A summary of changes in common stock issued and treasury stock is presented below. 
 
Common Stock

 
Treasury Stock

Balance at December 31, 2010
49,445,350

 
767

Purchase of treasury stock
—

 
4,280,000

Issuance pursuant to stock option and stock-SARS plan
122,983

 
(178,352
)
Awards of restricted stock
—

 
(12,384
)
Issuance of deferred shares
17,865

 
(12,671
)
Balance at December 31, 2011
49,586,198

 
4,077,360

Purchase of treasury stock
—

 
1,455,111

Issuance pursuant to stock option and stock-SARS plan
32,663

 
(842,746
)
Awards of restricted stock
—

 
(10,683
)
Issuance of deferred shares
—

 
(6,342
)
Balance at December 31, 2012
49,618,861

 
4,672,700

Purchase of treasury stock
—

 
10,174,755

Issuance pursuant to stock option and stock-SARS plan
106,891

 
(598,326
)
Awards of restricted stock
—

 
(10,395
)
Issuance of deferred shares
—

 
(17,360
)
Balance at December 31, 2013
49,725,752

 
14,221,374