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Stockholders' Equity (Stock Option Plan and Restricted Stock Activity) (Details)	9 Months Ended
	Sep. 30, 2016 $ / shares shares
Stock Options:
Balance as of December 31, 2015 | shares	1,683,341
Granted | shares	263,489
Exercised | shares	(130,185)
Forfeited | shares	(30,115)
Balance as of September 30, 2016 | shares	1,786,530
Weighted Average Exercise Price (in USD per share)
Balance as of December 31, 2015 | $ / shares	$ 34.23
Granted | $ / shares	92.09
Exercised | $ / shares	34.65
Forfeited | $ / shares	60.17
Balance as of September 30, 2016 | $ / shares	$ 42.29
Restricted Stock [Member]
Restricted Shares:
Nonvested at December 31, 2015 | shares	130,749
Granted | shares	234,855
Exercised | shares	(53,121)
Forfeited | shares	(2,183)
Nonvested at June 30, 2016 | shares	310,300
Weighted- Average Grant Date Fair Value (in USD per share)
Nonvested at December 31, 2015 | $ / shares	$ 60.36
Granted | $ / shares	95.31
Exercised | $ / shares	93.49
Forfeited | $ / shares	71.03
Nonvested at March 31, 2016 | $ / shares	$ 76.02

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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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.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Publisher FASB
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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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