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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member] | Treasury Stock [Member] | Series A Nonconvertible Preferred Stock [Member] Preferred Stock [Member]
--- | --- | --- | --- | --- | --- | --- | ---
BALANCE at Dec. 31, 2015 | $ 466,765,000 | $ 482,000 | $ 589,885,000 | $ (73,627,000) | $ (9,819,000) | $ (40,158,000) | $ 2,000
BALANCE (in shares) at Dec. 31, 2015 |  | 48,132,223 |  |  |  | 1,357,863 | 200,000
Net income | 48,070,000 |  |  | 48,070,000 |  |  |
Other comprehensive income (loss) | (847,000) |  |  |  | (847,000) |  |
Exercise of common stock options | 185,000 |  | 185,000 |  |  |  |
Exercise of common stock options (in shares) |  | 12,750 |  |  |  |  |
Issuance of common stock to employees | 12,356,000 | $ 2,000 | 12,354,000 |  |  |  |
Issuance of common stock to employees (in shares) |  | 165,826 |  |  |  |  |
Shares withheld for employee taxes | (4,871,000) | $ (1,000) | (4,870,000) |  |  |  |
Shares withheld for employee taxes (in shares) |  | (92,241) |  |  |  |  |
Cumulative effect of recording excess tax benefits from share-basedpayment arrangements | 4,232,000 |  | 4,232,000 |  |  |  |
Issuance of common stock to Board of Directors and Scientific Advisory Board | 2,012,000 |  | 2,012,000 |  |  |  |
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares) |  | 43,046 |  |  |  |  |
Issuance of common stock to employees under an ESPP | 566,000 |  | 566,000 |  |  |  |
Issuance of common stock to employees under an ESPP (in shares) |  | 9,386 |  |  |  |  |
BALANCE at Dec. 31, 2016 | 528,468,000 | $ 483,000 | 604,364,000 | (25,557,000) | (10,666,000) | $ (40,158,000) | $ 2,000
BALANCE (in shares) at Dec. 31, 2016 |  | 48,270,990 |  |  |  | 1,357,863 | 200,000
Net income | 103,885,000 |  |  | 103,885,000 |  |  |
Other comprehensive income (loss) | (798,000) |  |  |  | (798,000) |  |
Cash dividend | (5,652,000) |  |  | (5,652,000) |  |  |
Exercise of common stock options | 38,000 |  | 38,000 |  |  |  |
Exercise of common stock options (in shares) |  | 2,250 |  |  |  |  |
Issuance of common stock to employees | 12,242,000 | $ 3,000 | 12,239,000 |  |  |  |
Issuance of common stock to employees (in shares) |  | 265,233 |  |  |  |  |
Shares withheld for employee taxes | (9,432,000) | $ (1,000) | (9,431,000) |  |  |  |
Shares withheld for employee taxes (in shares) |  | (109,483) |  |  |  |  |
Cumulative effect of recording excess tax benefits from share-basedpayment arrangements | 26,450,000 |  |  | 26,450,000 |  |  |
Issuance of common stock to Board of Directors and Scientific Advisory Board | 2,909,000 |  | 2,909,000 |  |  |  |
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares) |  | 37,314 |  |  |  |  |
Issuance of common stock to employees under an ESPP | 944,000 |  | 944,000 |  |  |  |
Issuance of common stock to employees under an ESPP (in shares) |  | 9,730 |  |  |  |  |
BALANCE at Dec. 31, 2017 | 659,054,000 | $ 485,000 | 611,063,000 | 99,126,000 | (11,464,000) | $ (40,158,000) | $ 2,000
BALANCE (in shares) at Dec. 31, 2017 |  | 48,476,034 |  |  |  | 1,357,863 | 200,000
ASC Topic 606 Adoption at Dec. 31, 2017 | (17,100,000) |  |  | (17,100,000) |  |  |
ADJUSTED BALANCE at Dec. 31, 2017 | 641,954,000 | $ 485,000 | 611,063,000 | 82,026,000 | (11,464,000) | $ (40,158,000) | $ 2,000
BALANCE ADJUSTED (in shares) at Dec. 31, 2017 |  | 48,476,034 |  |  |  | 1,357,863 | 200,000
Net income | 58,840,000 |  |  | 58,840,000 |  |  |
Other comprehensive income (loss) | (4,770,000) |  |  |  | (4,770,000) |  |
Cash dividend | (11,314,000) |  |  | (11,314,000) |  |  |
Issuance of common stock to employees | 12,139,000 | $ 3,000 | 12,136,000 |  |  |  |
Issuance of common stock to employees (in shares) |  | 271,068 |  |  |  |  |
Shares withheld for employee taxes | (11,620,000) | $ (1,000) | (11,619,000) |  |  |  |
Shares withheld for employee taxes (in shares) |  | (108,113) |  |  |  |  |
Common shares repurchased | $ (477,000) |  |  |  |  | $ (477,000) |
Common shares repurchased (in shares) | (3,774) |  |  |  |  | 3,774 |
Issuance of common stock to Board of Directors and Scientific Advisory Board | $ 4,664,000 |  | 4,664,000 |  |  |  |
Issuance of common stock to Board of Directors and Scientific Advisory Board (in shares) |  | 32,232 |  |  |  |  |
Issuance of common stock to employees under an ESPP | 1,090,000 |  | 1,090,000 |  |  |  |
Issuance of common stock to employees under an ESPP (in shares) |  | 10,303 |  |  |  |  |
BALANCE at Dec. 31, 2018 | $ 690,506,000 | $ 487,000 | $ 617,334,000 | $ 129,552,000 | $ (16,234,000) | $ (40,635,000) | $ 2,000
BALANCE (in shares) at Dec. 31, 2018 |  | 48,681,524 |  |  |  | 1,361,637 | 200,000

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