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Share-Based Compensation (Summary of Stock Options Outstanding) (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares vested and exercisable	416,282	375,795
Options vested and exercisable weighted average remaining contractual life	4 years 11 months 5 days	5 years 1 month 2 days
Options vested and exercisable weighted average exercise price	$ 12.42	$ 8.72
Options vested and exercisable intrinsic value	$ 4,227	$ 7,554
$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	374,792
Options vested and exercisable weighted average remaining contractual life	4 years 7 months 10 days
Options vested and exercisable weighted average exercise price	$ 10.96
Options vested and exercisable intrinsic value	$ 4,209
$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	41,490
Options vested and exercisable weighted average remaining contractual life	7 years 10 months 10 days
Options vested and exercisable weighted average exercise price	$ 25.61
Options vested and exercisable intrinsic value	$ 18
$32.85-$37.30
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	$ 37.30
Number of shares vested and exercisable	0
Options vested and exercisable weighted average exercise price	$ 0.00
Options vested and exercisable intrinsic value	$ 0
$4.54-$8.65
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		$ 8.65
Number of shares vested and exercisable		329,433
Options vested and exercisable weighted average remaining contractual life		4 years 9 months 15 days
Options vested and exercisable weighted average exercise price		$ 7.62
Options vested and exercisable intrinsic value		$ 6,984
$8.70-$22.76
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range		$ 8.70
Range of exercise prices, upper range		$ 22.76
Number of shares vested and exercisable		38,598
Options vested and exercisable weighted average remaining contractual life		7 years 4 days
Options vested and exercisable weighted average exercise price		$ 15.09
Options vested and exercisable intrinsic value		$ 530
$23.57-$28.27
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		$ 28.27
Number of shares vested and exercisable		7,764
Options vested and exercisable weighted average remaining contractual life		8 years 3 months 22 days
Options vested and exercisable weighted average exercise price		$ 23.61
Options vested and exercisable intrinsic value		$ 40

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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=6415400&loc=d3e5070-113901

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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=6415400&loc=d3e5070-113901

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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=6415400&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
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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=6415400&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.

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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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