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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2018 | May 24, 2018
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Number of shares of common stock subject to awards |  |  |  |  | 1,500,000
Shares available for grant | 1,570,274 | 737,689 | 1,049,752 |  |
Amount of compensation exchanged for deferred stock units |  | $ 6,900 | $ 300 |  |
Minimum percentage stock option exercise price must be equal to fair market value | 100.00% |  |  |  |
Weighted average diluted shares outstanding excludes shares of common stock subject to stock options | 94,747 | 104,073 | 184,277 |  |
Number of shares authorized to be repurchased (in shares) |  |  |  | 150,000,000.0 |
Stock repurchase program, period in force | 3 years |  |  |  |
Stock repurchased during period (in shares) | 402,570 |  |  |  |
Weighted average price (in usd per share) | $ 71.28 |  |  |  |
Stock repurchased during period | $ 28,695 |  |  |  |
Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Expiration period of stock options | 6 years |  |  |  |
Deferred and Restricted Stock Unit |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Unrecognized compensation costs | $ 11,900 |  |  |  |
Unrecognized compensation costs, weighted-average recognition period | 1 year 2 months 12 days |  |  |  |
Stock Awards |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Unrecognized compensation costs | $ 700 |  |  |  |
Unrecognized compensation costs, weighted-average recognition period | 2 months 12 days |  |  |  |
Employees | Stock Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Vesting period | 5 years |  |  |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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