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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Total
Common Stock
Additional paid-in capital
Accumulated other comprehensive income (loss)
Accumulated deficit
Noncontrolling interest
Treasury stock
Balance at beginning of period at Dec. 31, 2012 $ 26,485 $ 21 $ 751,503 $ 0 $ (682,759)   $ (42,280)
Balance at beginning of period (in shares) at Dec. 31, 2012   21,278,606         (1,118,222)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock under employee stock compensation plans, net 3,128 $ 1 3,127        
Issuance of common stock under employee stock compensation plans (in shares)   308,137          
Stock-based compensation 5,666   5,666        
Retirement of treasury shares (in shares)   (1,118,222)         1,118,222
Retirement of treasury shares   $ (1) (42,279)       $ 42,280
Unrealized net loss on available-for-sale securities 2,914     2,914      
Net income 11,420       11,420    
Balance at end of period at Dec. 31, 2013 49,613 $ 21 718,017 2,914 (671,339)   $ 0
Balance at end of period (in shares) at Dec. 31, 2013   20,468,521         0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock under employee stock compensation plans, net 4,561   4,561        
Issuance of common stock under employee stock compensation plans (in shares)   360,054          
Consolidation of Viking (778)         $ (778)  
Stock-based compensation 11,270   11,270        
Unrealized net loss on available-for-sale securities 2,039     2,039      
Repurchase of common stock $ (67,955) $ (1) (67,954)        
Repurchase of common stock (in shares) (1,253,425) (1,253,425)          
Sale of warrants $ 11,638   11,638        
Purchase of convertible bond hedge (48,143)   (48,143)        
Equity component of convertible debt issuance, net of issuance costs 51,271   51,271        
Net income 12,024       12,024    
Net loss in noncontrolling interests (1,132)         (1,132)  
Balance at end of period at Dec. 31, 2014 24,408 $ 20 680,660 4,953 (659,315) (1,910) $ 0
Balance at end of period (in shares) at Dec. 31, 2014   19,575,150         0
Balance at beginning of period at Dec. 31, 2014 24,408 $ 20 680,660 4,953 (659,315) (1,910) $ 0
Balance at beginning of period (in shares) at Dec. 31, 2014   19,575,150         0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of common stock under employee stock compensation plans, net 8,849   8,849        
Issuance of common stock under employee stock compensation plans (in shares)   379,982          
Stock-based compensation 12,458   12,458        
Unrealized net loss on available-for-sale securities (50)     (50)      
Repurchase of common stock $ (489)   (489)        
Repurchase of common stock (in shares) (6,120) (6,120)          
Equity component of convertible debt issuance, net of issuance costs $ (39,628)   (39,628)        
Net income 229,824            
Net loss in noncontrolling interests (2,380)         (2,380)  
Deconsolidation of Viking 4,290         $ 4,290  
Balance at end of period at Dec. 31, 2015 237,282 $ 20 661,850 4,903 (429,491)   $ 0
Balance at end of period (in shares) at Dec. 31, 2015   19,949,012         0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 6,341            
Net loss in noncontrolling interests 0            
Balance at end of period at Dec. 31, 2015 $ 237,282 $ 20 $ 661,850 $ 4,903 $ (429,491)   $ 0
Balance at end of period (in shares) at Dec. 31, 2015   19,949,012         0