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Stock-Based Compensation Plans (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) director $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) shares
Unrecognized compensation cost and vesting period |  |  |
Unrecognized compensation costs related to unvested stock-based compensation arrangements | $ | $ 10,300 |  |
Weighted-average period for recognition of unrecognized stock-based compensation expense | 2 years 1 month 6 days |  |
Other disclosures |  |  |
Stock-based compensation expense recognized in operating expenses | $ | $ 10,356 | $ 12,744 | $ 13,113
Requisite service period for options to vest | 4 years |  |
Tax benefit of stock-based compensation expense in provision for income taxes | $ | $ 2,476 | 4,575 | 4,757
Allocated Share-based Compensation Expense, Net of Tax | $ | 7,880 | 8,169 | 8,356
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ | 15,372 | 11,043 | 13,186
Issuance of Company’s common stock | $ | 695 | 6,610 | 7,976
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options | $ | $ 0 | $ 0 | $ 251
Stock Bonus Plan |  |  |
Other disclosures |  |  |
Shares issued and committed to issue | shares | 9,000 | 12,000 | 10,000
Stock-based compensation expense recognized in operating expenses | $ | $ 800 | $ 1,200 | $ 800
Restricted Stock Units |  |  |
Restricted stock unit activity |  |  |
Outstanding at the beginning of the period (in shares) | shares | 696,000 |  |
Awarded (in shares) | shares | 189,167 |  |
Vested (in shares) | shares | (263,000) |  |
Forfeited (in shares) | shares | (18,000) |  |
Outstanding at the end of the period (in shares) | shares | 604,000 | 696,000 |
Outstanding and expected to vest at the end of the period (in shares) | shares | 598,000 |  |
Weighted-Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 35.34 |  |
Awarded (in dollars per share) | 54.99 |  |
Vested (in dollars per share) | 35.23 |  |
Forfeited (in dollars per share) | 39.23 |  |
Outstanding at the end of the period (in dollars per share) | 41.37 | $ 35.34 |
Outstanding and expected to vest at the end of the period (in dollars per share) | $ 41.32 |  |
Aggregate Intrinsic Value |  |  |
Outstanding at the end of the period (in dollars) | $ | $ 32,669 | $ 39,609 |
Outstanding and expected to vest at end of the period (in dollars) | $ | $ 32,388 |  |
Closing price per share (in dollars per share) | $ 54.13 |  |
Total intrinsic value of awards vested (in dollars) | $ | $ 9,800 | $ 10,800 | 10,300
Weighted-Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 35.34 |  |
Forfeited (in dollars per share) | 39.23 |  |
Outstanding at the end of the period (in dollars per share) | $ 41.37 | $ 35.34 |
Aggregate Intrinsic Value |  |  |
Outstanding at the end of the period (in dollars) | $ | $ 32,669 | $ 39,609 |
Non-Qualified Stock Options |  |  |
Weighted-Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 29.66 |  |
Forfeited (in dollars per share) | 29.66 |  |
Outstanding at the end of the period (in dollars per share) | $ 0 | $ 29.66 |
Aggregate Intrinsic Value |  |  |
Outstanding at the end of the period (in dollars) | $ | $ 0 | $ 780 |
Non-Qualified Stock Options activity |  |  |
Outstanding at the beginning of the period (in shares) | shares | 28,000 |  |
Exercised (in shares) | shares | (23,000) |  |
Forfeited (in shares) | shares | (5,000) |  |
Outstanding at the end of the period (in shares) | shares | 0 | 28,000 |
Weighted-Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 29.66 |  |
Exercised (in dollars per share) | 29.66 |  |
Forfeited (in dollars per share) | 29.66 |  |
Outstanding at the end of the period (in dollars per share) | $ 0 | $ 29.66 |
Weighted-Average Remaining Contractual Life |  |  |
Outstanding at the end of the period |  | 3 days |
Aggregate Intrinsic Value |  |  |
Outstanding at the end of the period (in dollars) | $ | $ 0 | $ 780 |
Total intrinsic value of stock options exercised (in dollars) | $ | $ 700 | $ 4,600 | $ 3,100
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 | 8 |  |
Foreign employees |  |  |
Other disclosures |  |  |
Shares issued and committed to issue | shares | 5,500 |  |
Shares expected to be settled In cash | shares | 3,500 |  |

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