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Share-Based Compensation (Summary of Stock Options Outstanding) (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |
Number of shares vested and exercisable | 514,612 | 412,489
Options vested and exercisable weighted average remaining contractual life | 5 years 8 months 1 day | 5 years 1 month 6 days
Options vested and exercisable weighted average exercise price | $ 20.39 | $ 12.16
Options vested and exercisable intrinsic value | $ 6,712 | $ 10,183
$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 | 425,351 |
Options vested and exercisable weighted average remaining contractual life | 5 years 7 months 2 days |
Options vested and exercisable weighted average exercise price | $ 17.47 |
Options vested and exercisable intrinsic value | $ 6,711 |
$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 | 67,654 |
Options vested and exercisable weighted average remaining contractual life | 5 years 2 months 5 days |
Options vested and exercisable weighted average exercise price | $ 34.02 |
Options vested and exercisable intrinsic value | $ 1 |
$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 | 21,607 |
Options vested and exercisable weighted average remaining contractual life | 8 years 8 months 23 days |
Options vested and exercisable weighted average exercise price | $ 35.10 |
Options vested and exercisable intrinsic value | $ 0 |
$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 |  | 378,504
Options vested and exercisable weighted average remaining contractual life |  | 4 years 10 months 6 days
Options vested and exercisable weighted average exercise price |  | $ 10.98
Options vested and exercisable intrinsic value |  | $ 9,792
$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 |  | 33,985
Options vested and exercisable weighted average remaining contractual life |  | 7 years 11 months 12 days
Options vested and exercisable weighted average exercise price |  | $ 25.34
Options vested and exercisable intrinsic value |  | $ 391
$32.85 - $36.30 |  |
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 |  | $ 36.3
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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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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