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Shareholders' Equity and Common Stock Equivalents - Narrative (Details) | 12 Months Ended |
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Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 shares | Dec. 31, 2012 | Sep. 30, 2015 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock, par value (in usd per share) | $ 0.001 | $ 0.001 | $ 0.001 |  |  |  |
Shares reacquired during period (in shares) | shares | 2,977,162 | 129,112 | 48,440 |  |  |  |
Percentage of outstanding shares reacquired |  | 0.30% | 0.10% |  |  |  |
Shares reacquired during period, value | $ |  |  | $ 5,100,000 | $ 1,700,000 |  |  |
Share price of treasury stock acquired during period (in usd per share) | $ 25.94 |  | $ 39.41 | $ 34.28 |  |  |
Remaining authorized repurchase amount | $ | $ 22,800,000 |  |  |  |  |  |
Treasury stock (in shares) | shares | 24,850,484 | 24,850,484 |  |  |  |  |
Preferred stock, shares authorized (in shares) | shares | 1,000,000 | 1,000,000 |  |  |  |  |
Preferred stock, par value (in usd per share) | $ 0.001 | $ 0.001 |  |  |  |  |
Fungible share pool, grant of full value share conversion ratio |  |  |  |  |  | 2.5 |
Intrinsic value | 0 |  |  |  |  |  |
Weighted average exercise prices of vested and exercisable options (in usd per share) | 34.81 | $ 31.42 | $ 27.12 |  |  |  |
Share price (in usd per share) | $ 43.66 |  |  |  |  |  |
Aggregate intrinsic value of vested options | $ | $ 3,300,000 |  |  |  |  |  |
Aggregate intrinsic value of options | $ | $ 5,300,000 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expiration period | 7 years |  |  |  |  |  |
Minimum | Employee stock option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |  |
Minimum | Restricted stock units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period | 1 year |  |  |  |  |  |
Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expiration period | 10 years |  |  |  |  |  |
Maximum | Restricted stock units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period | 5 years |  |  |  |  |  |
2015 Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Authorized repurchase amount | $ |  |  |  |  |  |  | $ 50,000,000.0
Common stock, par value (in usd per share) |  |  |  |  |  |  | $ 0.001
Comprehensive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Amended increase in shares reserved for issuance (in shares) | shares |  |  |  |  | 3,250,000 |  |
Shares available for grant (in shares) | shares | 1,187,200 |  |  |  |  |  |

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