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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Employee Stock Options and Awards [Member] | Employee Stock Purchases [Member] | Common Stock [Member] | Additional Paid-In Capital [Member] | Additional Paid-In Capital [Member] Employee Stock Options and Awards [Member] | Additional Paid-In Capital [Member] Employee Stock Purchases [Member] | Accumulated Other Comprehensive Income [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2013 |  |  |  | 30,022 |  |  |  |  |
Beginning Balance at Dec. 31, 2013 | $ 436,686 |  |  | $ 30 | $ 223,660 |  |  | $ (470) | $ 213,466
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock option and stock award plans (in shares) |  |  |  | 697 |  |  |  |  |
Issuance of common stock under employee stock option and stock award plans | 9,571 |  |  | $ 0 | 9,571 |  |  |  |
Repurchase of common stock (in shares) |  |  |  | (1,603) |  |  |  |  |
Repurchase of common stock | (80,761) |  |  | $ (1) | (80,760) |  |  |  |
Issuance of common stock under employee stock purchase plan (in shares) |  |  |  | 92 |  |  |  |  |
Issuance of common stock under employee stock purchase plan | 4,284 |  |  |  | 4,284 |  |  |  |
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net | 815 |  |  |  | 815 |  |  |  |
Stock-based compensation expense |  | $ 12,983 | $ 1,385 |  |  | $ 12,983 | $ 1,385 |  |
Payment of dividends to stockholders | (13,165) |  |  |  |  |  |  |  | (13,165)
Unrealized actuarial loss on pension benefits, net of tax | (460) |  |  |  |  |  |  | (460) |
Unrealized gain (loss) on marketable securities, | (127) |  |  |  |  |  |  | (127) |
Translation adjustment | (79) |  |  |  |  |  |  | (79) |
Net income | 59,544 |  |  |  |  |  |  |  | 59,544
Ending Balance (in shares) at Dec. 31, 2014 |  |  |  | 29,208 |  |  |  |  |
Ending Balance at Dec. 31, 2014 | 430,676 |  |  | $ 29 | 171,938 |  |  | (1,136) | 259,845
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock option and stock award plans (in shares) |  |  |  | 578 |  |  |  |  |
Issuance of common stock under employee stock option and stock award plans | 8,133 |  |  | $ 0 | 8,133 |  |  |  |
Repurchase of common stock (in shares) |  |  |  | (1,250) |  |  |  |  |
Repurchase of common stock | (53,731) |  |  | $ (1) | (53,730) |  |  |  |
Issuance of common stock under employee stock purchase plan (in shares) |  |  |  | 117 |  |  |  |  |
Issuance of common stock under employee stock purchase plan | 4,447 |  |  |  | 4,447 |  |  |  |
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net | (189) |  |  |  | (189) |  |  |  |
Stock-based compensation expense |  | 13,562 | 1,205 |  |  | 13,562 | 1,205 |  |
Payment of dividends to stockholders | (13,916) |  |  |  |  |  |  |  | (13,916)
Unrealized actuarial loss on pension benefits, net of tax | (344) |  |  |  |  |  |  | (344) |
Unrealized gain (loss) on marketable securities, | (180) |  |  |  |  |  |  | (180) |
Translation adjustment | (191) |  |  |  |  |  |  | (191) |
Net income | 39,147 |  |  |  |  |  |  |  | 39,147
Ending Balance (in shares) at Dec. 31, 2015 |  |  |  | 28,653 |  |  |  |  |
Ending Balance at Dec. 31, 2015 | 428,619 |  |  | $ 28 | 145,366 |  |  | (1,851) | 285,076
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock option and stock award plans (in shares) |  |  |  | 615 |  |  |  |  |
Issuance of common stock under employee stock option and stock award plans | 8,479 |  |  | $ 0 | 8,479 |  |  |  |
Repurchase of common stock (in shares) |  |  |  | (146) |  |  |  |  |
Repurchase of common stock | (6,435) |  |  | $ 0 | (6,435) |  |  |  |
Issuance of common stock under employee stock purchase plan (in shares) |  |  |  | 128 |  |  |  |  |
Issuance of common stock under employee stock purchase plan | 4,580 |  |  |  | 4,580 |  |  |  |
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net | 0 |  |  |  |  |  |  |  |
Stock-based compensation expense |  | $ 19,599 | $ 1,286 |  |  | $ 19,599 | $ 1,286 |  |
Payment of dividends to stockholders | (15,054) |  |  |  |  |  |  |  | (15,054)
Unrealized actuarial loss on pension benefits, net of tax | (352) |  |  |  |  |  |  | (352) |
Unrealized gain (loss) on marketable securities, | (123) |  |  |  |  |  |  | (123) |
Translation adjustment | (384) |  |  |  |  |  |  | (384) |
Net income | 47,890 |  |  |  |  |  |  |  | 47,890
Ending Balance (in shares) at Dec. 31, 2016 |  |  |  | 29,250 |  |  |  |  |
Ending Balance at Dec. 31, 2016 | $ 488,105 |  |  | $ 28 | $ 172,875 |  |  | $ (2,710) | $ 317,912

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