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Consolidated Statement of Stockholders' Equity - USD ($) | 401(k) Plan [Member] Common Stock [Member] Common Class A [Member] | 401(k) Plan [Member] Common Stock [Member] | 401(k) Plan [Member] Retained Earnings [Member] | 401(k) Plan [Member] Treasury Stock [Member] Common Class A [Member] | 401(k) Plan [Member] Treasury Stock [Member] | 401(k) Plan [Member] AOCI Attributable to Parent [Member] | 401(k) Plan [Member] | Restricted Stock [Member] Common Stock [Member] Common Class A [Member] | Restricted Stock [Member] Common Stock [Member] | Restricted Stock [Member] Retained Earnings [Member] | Restricted Stock [Member] Treasury Stock [Member] Common Class A [Member] | Restricted Stock [Member] Treasury Stock [Member] | Restricted Stock [Member] AOCI Attributable to Parent [Member] | Restricted Stock [Member] | 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, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,331,574 | 56,503,759 |  | (1,578,554) | (4,739,462) |  |
Balance at Dec. 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,321,000 | $ 480,773,000 | $ (269,288,000) | $ (22,398,000) | $ (40,303,000) | $ (20,170,000) | $ 143,935,000
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 18,288,000 | 0 | 0 | 0 | 18,288,000
Adjustment to pension liability, net of income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 0 | $ 0 | $ 0 | 9,761,000 | $ 9,761,000
401(k) plan (in shares) | 0 | 5,235 |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,235
401(k) plan | $ 0 | $ 28,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 28,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 28,000
Restricted stock awards (in shares) |  |  |  |  |  |  |  | 0 | 382,062 |  | 0 | (29,463) |  |  |  |  |  |  |  |  |
Restricted stock awards |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ (256,000) | $ 0 | $ (256,000) |  |  |  |  |  |  |
Option exercises (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 119,822 |  | 0 | 0 |  | 119,822
Option exercises |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 280,000 | 0 | $ 0 | $ 0 | 0 | $ 280,000
Amortization of restricted stock and stock option awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 1,974,000 | 0 | $ 0 | $ 0 | 0 | 1,974,000
Balance (in shares) at Dec. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,331,574 | 57,010,878 |  | (1,578,554) | (4,768,925) |  |
Balance at Dec. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,321,000 | $ 483,055,000 | (251,000,000) | $ (22,398,000) | $ (40,559,000) | (10,409,000) | 174,010,000
Adjustment to pension liability, net of income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 9,761,000 | 9,761,000
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 18,288,000 | 0 | 0 | 0 | 18,288,000
Restricted stock awards |  |  |  |  |  |  |  | $ 0 | $ 0 | 0 | $ 0 | $ (256,000) | 0 | (256,000) |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 48,061,000 | 0 | 0 | 0 | 48,061,000
Adjustment to pension liability, net of income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | (10,403,000) | $ (10,403,000)
401(k) plan (in shares) | 0 | 2,341 |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,341
401(k) plan | $ 0 | $ 25,000 | 0 | $ 0 | $ 0 | 0 | 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000
Restricted stock awards (in shares) |  |  |  |  |  |  |  | 236,294 | 312,961 |  | 0 | (45,791) |  |  |  |  |  |  |  |  |
Restricted stock awards |  |  |  |  |  |  |  | $ 0 | $ 0 | 0 | $ 0 | $ (513,000) | 0 | (513,000) |  |  |  |  |  |  |
Amortization of restricted stock and stock option awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,775,000 | $ 3,237,000 | 0 | $ 0 | $ 0 | 0 | 5,012,000
Balance (in shares) at Dec. 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,567,868 | 57,326,180 |  | (1,578,554) | (4,814,716) |  |
Balance at Dec. 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,096,000 | $ 486,317,000 | (202,939,000) | $ (22,398,000) | $ (41,072,000) | (20,812,000) | 216,192,000
Adjustment to pension liability, net of income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | (10,403,000) | (10,403,000)
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 48,061,000 | 0 | 0 | 0 | 48,061,000
Restricted stock awards |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 | $ (513,000) | $ 0 | $ (513,000) |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 39,301,000 | 0 | 0 | 0 | 39,301,000
Adjustment to pension liability, net of income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 0 | $ 0 | $ 0 | 3,528,000 | $ 3,528,000
401(k) plan (in shares) | 0 | 1,898 |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,898
401(k) plan | $ 0 | $ 26,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ 26,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26,000
Restricted stock awards (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 287,513 | 150,308 |  | (32,817) | (67,989) |  |
Restricted stock awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 0 | $ (287,000) | $ (818,000) | 0 | (1,105,000)
Amortization of restricted stock and stock option awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,229,000 | $ 1,790,000 | 0 | $ 0 | $ 0 | 0 | 4,019,000
Balance (in shares) at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,855,381 | 70,989,426 |  | (1,611,371) | (4,882,705) |  |
Balance at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,325,000 | $ 655,446,000 | (163,638,000) | $ (22,685,000) | $ (41,890,000) | (17,284,000) | 429,274,000
Adjustment to pension liability, net of income tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0 | 3,528,000 | 3,528,000
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 39,301,000 | $ 0 | $ 0 | 0 | 39,301,000
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 13,511,040 |  | 0 | 0 |  |
Underwritten public offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 167,313,000 | 0 | $ 0 | $ 0 | 0 | 167,313,000
Restricted stock awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ (287,000) | $ (818,000) | $ 0 | $ (1,105,000)

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