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Stock-Based Compensation (Summary of Restricted Stock Unit Activity) (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Number of Shares |  |  |  |  |  |
Outstanding, beginning balance (in shares) | 378,261 | 366,770 | 277,719 |  |  |
Granted (in shares) | 80,254 | 106,764 | 140,452 |  |  |
Converted (in shares) | (97,997) | (90,385) | (44,656) |  |  |
Canceled (in shares) | (9,497) | (4,888) | (6,745) |  |  |
Outstanding, ending balance (in shares) | 351,021 | 378,261 | 366,770 |  |  |
Unvested (in shares) |  |  |  | 351,021 |  |
Weighted-Average Grant-Date Fair Value |  |  |  |  |  |
Weighted-Average Grant-Date Fair Value, Outstanding, beginning balance (in dollars per share) | $ 96.23 | $ 79.72 | $ 77.22 |  |  |
Weighted-Average Grant-Date Fair Value, Granted (in dollars per share) | 227.45 | 127.29 | 81.86 |  |  |
Weighted-Average Grant-Date Fair Value, Converted (in dollars per share) | 91.62 | 66.18 | 70.64 |  |  |
Weighted-Average Grant-Date Fair Value, Canceled (in dollars per share) | 121.37 | 90.54 | 81.89 |  |  |
Weighted-Average Grant-Date Fair Value, Outstanding, ending balance (in dollars per share) | 126.93 | 96.23 | 79.72 |  |  |
Weighted-Average Grant-Date Fair Value, Unvested (in dollars per share) | $ 96.23 | $ 79.72 | $ 77.22 | $ 126.93 | $ 96.23 | $ 79.72
Additional Disclosures |  |  |  |  |  |
Weighted-Average Remaining Contractual Life, Outstanding | 2 years 7 months 13 days | 2 years 6 months 18 days | 2 years 6 months 18 days |  |  |
Weighted-Average Remaining Contractual Life, Unvested | 2 years 7 months 13 days |  |  |  |  |
Aggregate Intrinsic Value, Outstanding |  |  |  | $ 39,767 | $ 80,997 | $ 36,204
Aggregate Intrinsic Value, Unvested |  |  |  | $ 39,767 |  |

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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