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Summary of Unaudited Quarterly Financial Information Restated of Previously Reported Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Income tax benefit $ 514 $ 191,881 $ (265) $ (15) $ (280) $ (124) $ 47 $ (53)   $ 192,115 $ (410) $ (374)  
Net income $ 6,341 $ 199,165 $ 23,564 $ 754 $ 7,055 $ 1,280 $ 1,592 $ 2,097   229,824 12,024 11,420  
Comprehensive income                   $ 229,792 $ 14,063 $ 14,334  
Basic net income per share (in usd per share) $ 0.32 $ 10.01 $ 1.19 $ 0.04 $ 0.35 $ 0.06 $ 0.08 $ 0.10   $ 11.61 $ 0.59 $ 0.56  
Diluted net income per share (in usd per share) $ 0.29 $ 9.28 $ 1.11 $ 0.04 $ 0.34 $ 0.06 $ 0.07 $ 0.10   $ 10.83 $ 0.56 $ 0.55  
Long-term deferred tax assets $ 189,083                 $ 189,083      
Assets 503,061       $ 258,029         503,061 $ 258,029    
Liabilities and Equity 503,061       258,029         503,061 258,029    
Total liabilities and stockholders' equity 237,282       24,408         237,282 24,408 $ 49,613 $ 26,485
Accumulated deficit $ (429,491)       $ (659,315)         $ (429,491) $ (659,315)    
Weighted average number of common shares-basic (shares) 19,933,000 19,887,000 19,725,000 19,612,000 19,878,000 20,417,000 20,738,000 20,601,000   19,789,991 20,418,569 20,312,395  
Weighted average number of common shares-diluted (shares) 21,542,000 21,460,000 21,276,000 20,631,000 20,792,000 21,345,000 21,780,000 21,208,000   21,227,887 21,433,178 20,745,454  
Previously Reported                          
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Income tax benefit                   $ 219,596      
Net income                   257,305      
Comprehensive income                   $ 257,273      
Basic net income per share (in usd per share)                   $ 13.00      
Diluted net income per share (in usd per share)                   $ 12.12      
Long-term deferred tax assets $ 216,564                 $ 216,564      
Assets 533,929                 533,929      
Liabilities and Equity 533,929                 533,929      
Accumulated deficit (402,010)                 (402,010)      
Restatement Adjustment [Member]                          
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Income tax benefit                   27,481      
Net income                   (27,481)      
Comprehensive income                   $ (27,481)      
Basic net income per share (in usd per share)                   $ (1.39)      
Diluted net income per share (in usd per share)                   $ (1.29)      
Long-term deferred tax assets (27,481)                 $ (27,481)      
Assets (27,481)                 (27,481)      
Liabilities and Equity (27,481)                 (27,481)      
Accumulated deficit $ (27,481)                 $ (27,481)      
10-K                          
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Income tax benefit   $ 191,881             $ 191,602        
Net income   199,165             223,483        
Comprehensive income   $ 195,500             $ 223,870        
Basic net income per share (in usd per share)   $ 10.01             $ 11.33        
Diluted net income per share (in usd per share)   $ 9.28             $ 10.58        
Long-term deferred tax assets   $ 181,049             $ 181,049        
Assets   496,326             496,326        
Liabilities and Equity   496,326             496,326        
Total liabilities and stockholders' equity   266,807             266,807        
Accumulated deficit   (435,832)             $ (435,832)        
Weighted average number of common shares-basic (shares)                 19,887,000        
Weighted average number of common shares-diluted (shares)                 21,122,000        
10-K | Previously Reported                          
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Income tax benefit   219,362             $ 219,083        
Net income   226,646             250,964        
Comprehensive income   $ 222,981             $ 251,351        
Basic net income per share (in usd per share)   $ 11.40             $ 12.71        
Diluted net income per share (in usd per share)   $ 10.56             $ 11.88        
Long-term deferred tax assets   $ 208,530             $ 208,530        
Assets   523,807             523,807        
Liabilities and Equity   523,807             523,807        
Total liabilities and stockholders' equity   294,288             294,288        
Accumulated deficit   (408,351)             $ (408,351)        
Weighted average number of common shares-basic (shares)                 19,887,000        
Weighted average number of common shares-diluted (shares)                 21,122,000        
10-K | Restatement Adjustment [Member]                          
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Income tax benefit   27,481                      
Net income   (27,481)             $ (27,481)        
Comprehensive income   $ (27,481)             $ (27,481)        
Basic net income per share (in usd per share)   $ (1.39)             $ (1.38)        
Diluted net income per share (in usd per share)   $ (1.28)             $ (1.30)        
Long-term deferred tax assets   $ (27,481)             $ (27,481)        
Assets   (27,481)             (27,481)        
Liabilities and Equity   (27,481)             (27,481)        
Total liabilities and stockholders' equity   (27,481)             (27,481)        
Accumulated deficit   (27,481)             $ (27,481)        
Weighted average number of common shares-basic (shares)                 0        
Weighted average number of common shares-diluted (shares)                 0        
10-Q                          
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Income tax benefit   219,362             $ 219,083        
Net income   $ 226,646             $ 250,964        
Basic net income per share (in usd per share)   $ 11.40             $ 12.71        
Diluted net income per share (in usd per share)   $ 10.56             $ 11.88        
Long-term deferred tax assets   $ 208,530             $ 208,530        
Accumulated deficit   (408,351)             (408,351)        
10-Q | Previously Reported                          
Error Corrections and Prior Period Adjustments Restatement [Line Items]                          
Income tax benefit   217,255             216,976        
Net income   $ 224,539             $ 248,857        
Basic net income per share (in usd per share)   $ 11.29             $ 12.61        
Diluted net income per share (in usd per share)   $ 10.46             $ 11.78        
Long-term deferred tax assets   $ 206,423             $ 206,423        
Accumulated deficit   $ (410,458)             $ (410,458)