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Consolidated Statement of Changes in Stockholders / Members Equity (USD $)
In Thousands
Total
Capital Contributions [Member]
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Retained Deficit/Accumulated Loss [Member]
Balance at Dec. 31, 2009 $ 171,850 $ 235,000       $ (63,150)
Balance, shares at Dec. 31, 2009              
Issuance of common stock 920   920      
Issuance of common stock, shares     92,000      
Proceeds from the sale of common stock 398,749       398,749  
Reclassification of members' contributions   (235,000)     235,000  
Stock-based compensation 9,970       9,970  
Stock-based compensation, shares     240      
Net income (loss) (29,695)         (29,695)
Balance at Dec. 31, 2010 551,794   920   643,719 (92,845)
Balance, shares at Dec. 31, 2010     92,240      
Stock-based compensation 3,656       3,656  
Stock-based compensation, shares     243      
Vesting of restricted shares     1   (1)  
Treasury stock - tax withholdings (602)     (602)    
Treasury stock - tax withholdings, shares     (22) 22    
Net income (loss) 79,390         79,390
Balance at Dec. 31, 2011 634,238   921 (602) 647,374 (13,455)
Balance, shares at Dec. 31, 2011     92,461 22    
Stock-based compensation 10,573       10,573  
Stock-based compensation, shares     949      
Vesting of restricted shares     4   (4)  
Treasury stock - tax withholdings (3,194)     (3,194)    
Treasury stock - tax withholdings, shares     (107) 107    
Net income (loss) 153,388         153,388
Balance at Dec. 31, 2012 $ 795,005   $ 925 $ (3,796) $ 657,943 $ 139,933
Balance, shares at Dec. 31, 2012     93,303 129