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Consolidated Statement of Stockholders' Equity - USD ($)
$ in Thousands
Common Stock [Member]
Common Class A [Member]
Common Stock [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Common Class A [Member]
Treasury Stock [Member]
AOCI Attributable to Parent [Member]
Total
Balance (in shares) at Dec. 31, 2013 7,331,574 57,010,878   (1,578,554) (4,768,925)    
Balance at Dec. 31, 2013 $ 15,321 $ 483,055 $ (251,000) $ (22,398) $ (40,559) $ (10,409) $ 174,010
Net income   48,061     48,061
Adjustment to pension liability, net of income tax       (10,403) (10,403)
401(k) plan $ 25     $ 25
401(k) plan (in shares)   2,341       2,341
Restricted stock awards (in shares) 236,294 312,961   (45,791)    
Restricted stock awards $ (513) $ (513)
Share-based compensation $ 1,775 $ 3,237 5,012
Balance (in shares) at Dec. 31, 2014 7,567,868 57,326,180   (1,578,554) (4,814,716)    
Balance at Dec. 31, 2014 $ 17,096 $ 486,317 (202,939) $ (22,398) $ (41,072) (20,812) 216,192
Net income 39,301 39,301
Adjustment to pension liability, net of income tax (3,528) (3,528)
401(k) plan $ 26 $ 26
401(k) plan (in shares)   1,898     1,898
Restricted stock awards (in shares) 287,513 150,308   (32,817) (67,989)    
Restricted stock awards $ (287) $ (818) $ (1,105)
Share-based compensation $ 2,229 $ 1,790 4,019
Balance (in shares) at Dec. 31, 2015 7,855,381 70,989,426   (1,611,371) (4,882,705)    
Balance at Dec. 31, 2015 $ 19,325 $ 655,446 (163,638) $ (22,685) $ (41,890) (17,284) 429,274
Underwritten public offering $ 167,313 167,313
Underwritten public offering (in shares)   13,511,040      
Net income 62,273 62,273
Adjustment to pension liability, net of income tax (361) (361)
401(k) plan $ 29 $ 29
401(k) plan (in shares) 2,571         2,571
Restricted stock awards (in shares) 218,612 237,500   (57,760) (60,518)    
Restricted stock awards $ (655) $ (798) $ (1,453)
Share-based compensation $ 2,439 $ 2,660 5,099
Balance (in shares) at Dec. 31, 2016 8,073,993 71,229,497   (1,669,131) (5,135,406)    
Balance at Dec. 31, 2016 $ 21,764 $ 658,135 (101,365) $ (23,340) $ (44,688) (17,645) 492,861
Repurchase of common stock $ (2,000) $ (2,000)
Repurchase of common stock (in shares)         (192,183)