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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Total
Class A Common Stock [Member]
Class B Common Stock [Member]
Class C Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Treasury Stock [Member]
Noncontrolling interest in a consolidated variable interest entity [Member]
Balance at Dec. 31, 2012 $ 2,239 $ 217 $ 77   $ 410,514 $ (408,569)    
Balance, Shares at Dec. 31, 2012   21,677,248 7,702,471          
Stock-based compensation expense 2,080       2,080      
Conversion of Class B common stock to Class A common stock   $ 77 $ (77)          
Conversion of Class B common stock to Class A common stock, shares   7,702,471 (7,702,471)          
Purchase of treasury stock (8,422)           $ (8,422)  
Purchase of treasury stock, shares             (365,384)  
Exercise of stock options 6,959 $ 12     (1,475)   $ 8,422  
Exercise of stock options, shares   1,218,816         365,384  
Common stock dividends declared (14,302)       (14,302)      
Net income (loss) (1,785)         (1,785)    
Net income (loss) (1,785)              
Balance at Dec. 31, 2013 (13,231) $ 306     396,817 (410,354)    
Balance, Shares at Dec. 31, 2013   30,598,535            
Balance, Shares at Dec. 31, 2013     0          
Stock-based compensation expense 7,598       7,598      
Exercise of stock options 2,031 $ 6     2,025      
Exercise of stock options, shares   573,525            
Excess tax benefit from stock option exercises 10,034       10,034      
Common stock dividends declared (18,445)       (18,445)      
Consolidation of a variable interest entity 4,000             $ 4,000
Net income (loss) 64,550         64,550    
Net income (loss) 64,550              
Balance at Dec. 31, 2014 56,537 $ 312     398,029 (345,804)   4,000
Balance, Shares at Dec. 31, 2014   31,172,060 0 0        
Stock-based compensation expense 11,400       11,400      
Purchase of treasury stock (48,660)           $ (48,660)  
Purchase of treasury stock, shares             (1,010,565)  
Exercise of stock options, shares             17,000  
Exercise of stock options and vesting of restricted stock units 3,357 $ 4     2,439   $ 914  
Exercise of stock options and vesting of restricted stock units, shares   449,309         17,000  
Excess tax benefit from stock option exercises 8,042       8,042      
Common stock dividends declared (23,686)       (23,686)      
Consolidation of a variable interest entity 2,900             2,900
Contribution from a noncontrolling interest 100             100
Net income (loss) 77,684              
Net income (loss) 76,383         77,684   (1,301)
Balance at Dec. 31, 2015 $ 86,373 $ 316     $ 396,224 $ (268,120) $ (47,746) $ 5,699
Balance, Shares at Dec. 31, 2015   31,621,369 0 0        
Balance, Shares at Dec. 31, 2015 993,565           (993,565)