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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Sep. 30, 2016 - USD ($) | 401(k) Plan [Member] Common Stock [Member] | 401(k) Plan [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, 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
Net income |  |  |  |  | 26,439,000 |  |  |  | 26,439,000
Adjustment to pension liability, net of income tax |  |  |  |  |  |  |  |  |
401(k) plan (in shares) | 1,765 |  |  |  |  |  |  |  |
Issuance of common stock | $ 21,000 | $ 21,000 |  |  |  | $ (655,000) | $ (798,000) |  | (1,453,000)
Restricted stock awards (in shares) |  |  | 218,612 | 237,500 |  | (57,760) | (60,518) |  |
Amortization of restricted stock and stock option awards |  |  | $ 1,824,000 | $ 2,003,000 |  |  |  |  | 3,827,000
Balance (in shares) at Sep. 30, 2016 |  |  | 8,073,993 | 71,228,691 |  | (1,669,131) | (4,943,223) |  |
Balance at Sep. 30, 2016 |  |  | $ 21,149,000 | $ 657,470,000 | $ (137,199,000) | $ (23,340,000) | $ (42,688,000) | $ (17,284,000) | $ 458,108,000

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