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Stock-Based Compensation Plans (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) director $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) shares
Unrecognized compensation cost and vesting period |  |  |
Unrecognized compensation costs related to unvested stock-based compensation arrangements | $ 7,700 |  |
Weighted-average period for recognition of unrecognized stock-based compensation expense | 1 year 9 months 18 days |  |
Other disclosures |  |  |
Stock-based compensation expense recognized in operating expenses | $ 9,480 | $ 10,356 | $ 12,744
Requisite service period for options to vest | 4 years |  |
Tax benefit of stock-based compensation expense in provision for income taxes | $ 2,330 | 2,476 | 4,575
Share-based Payment Arrangement, Expense, after Tax | 7,150 | 7,880 | 8,169
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | 16,760 | 15,372 | 11,043
Issuance of Company’s common stock | $ 0 | $ 695 | $ 6,610
Stock Bonus Plan |  |  |
Other disclosures |  |  |
Shares issued and committed to issue | shares | 7,000 | 9,000,000 | 12,000
Stock-based compensation expense recognized in operating expenses | $ 800 | $ 800 | $ 1,200
Restricted Stock Units |  |  |
Restricted stock unit activity |  |  |
Outstanding at the beginning of the period (in shares) | shares | 604,000 |  |
Awarded (in shares) | shares | 220,660 |  |
Vested (in shares) | shares | (275,000) |  |
Forfeited (in shares) | shares | (87,000) |  |
Outstanding at the end of the period (in shares) | shares | 462,000 | 604,000 |
Outstanding and expected to vest at the end of the period (in shares) | shares | 458,000 |  |
Weighted-Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ / shares | $ 41.37 |  |
Awarded (in dollars per share) | $ / shares | 57.73 |  |
Vested (in dollars per share) | $ / shares | 37.71 |  |
Forfeited (in dollars per share) | $ / shares | 57.06 |  |
Outstanding at the end of the period (in dollars per share) | $ / shares | 47.75 | $ 41.37 |
Outstanding and expected to vest at the end of the period (in dollars per share) | $ / shares | $ 47.69 |  |
Aggregate Intrinsic Value |  |  |
Outstanding at the end of the period (in dollars) | $ 37,065 | $ 32,669 |
Outstanding and expected to vest at end of the period (in dollars) | $ 36,763 |  |
Closing price per share (in dollars per share) | $ / shares | $ 80.23 |  |
Total intrinsic value of awards vested (in dollars) | $ 16,700 | $ 9,800 | $ 10,800
Weighted-Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ / shares | $ 41.37 |  |
Forfeited (in dollars per share) | $ / shares | 57.06 |  |
Outstanding at the end of the period (in dollars per share) | $ / shares | $ 47.75 | $ 41.37 |
Aggregate Intrinsic Value |  |  |
Outstanding at the end of the period (in dollars) | $ 37,065 | $ 32,669 |
Non-Qualified Stock Options | 2011 Plan |  |  |
Stock-Based Compensation |  |  |
Maximum common stock shares that may be issued under plan | shares | 16,300,000 |  |
Independent directors | Restricted Stock Units |  |  |
Aggregate Intrinsic Value |  |  |
Number Of Directors | director | 7 |  |
Foreign employees |  |  |
Other disclosures |  |  |
Shares issued and committed to issue | shares | 4,000 |  |
Shares expected to be settled In cash | shares | 3,000 |  |

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