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Share-Based Compensation (Summary of Stock Options Outstanding) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares vested and exercisable	560,848	359,656
Options vested and exercisable weighted average remaining contractual life	5 years 3 months 18 days	5 years 6 months 6 days
Options vested and exercisable weighted average exercise price	$ 18.67	$ 11.96
Options vested and exercisable intrinsic value	$ 11,400	$ 8,414
$4.54 - $32.80
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range	$ 4.54
Range of exercise prices, upper range	$ 32.8
Number of shares vested and exercisable	486,601
Options vested and exercisable weighted average remaining contractual life	5 years 2 months 8 days
Options vested and exercisable weighted average exercise price	$ 16.32
Options vested and exercisable intrinsic value	$ 11,036
$32.85 - $34.10
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range	$ 32.85
Range of exercise prices, upper range	$ 34.10
Number of shares vested and exercisable	65,054
Options vested and exercisable weighted average remaining contractual life	5 years 7 months 21 days
Options vested and exercisable weighted average exercise price	$ 34.06
Options vested and exercisable intrinsic value	$ 322
$34.15 - $39.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range	$ 34.15
Range of exercise prices, upper range	$ 39
Number of shares vested and exercisable	9,193
Options vested and exercisable weighted average remaining contractual life	8 years 10 months 24 days
Options vested and exercisable weighted average exercise price	$ 34.45
Options vested and exercisable intrinsic value	$ 42
$4.54 - $22.76
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range		$ 4.54
Range of exercise prices, upper range		$ 22.76
Number of shares vested and exercisable		341,654
Options vested and exercisable weighted average remaining contractual life		5 years 4 months 27 days
Options vested and exercisable weighted average exercise price		$ 11.31
Options vested and exercisable intrinsic value		$ 8,213
$23.57 - $32.80
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range		$ 23.57
Range of exercise prices, upper range		$ 32.80
Number of shares vested and exercisable		18,002
Options vested and exercisable weighted average remaining contractual life		7 years 6 months 6 days
Options vested and exercisable weighted average exercise price		$ 24.19
Options vested and exercisable intrinsic value		$ 201
$32.85 - $36.70
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range		$ 32.85
Range of exercise prices, upper range		$ 36.70
Number of shares vested and exercisable		0
Options vested and exercisable weighted average exercise price		$ 0.00
Options vested and exercisable intrinsic value		$ 0

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ 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)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ 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)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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