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Equity Compensation Plans (Activity Under Stock Based Compensation Plans) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Beginning balance, Number of Shares Outstanding, Stock Options |  | 2,454 | 2,734 |
Granted, Number of Shares Outstanding, Stock Options |  | 65 | 215 |
Exercised, Number of Shares Outstanding, Stock Options |  | (458) | (101) |
Cancelled or forfeited, Number of Shares Outstanding, Stock Options |  | (35) | (394) |
Ending balance, Number of Shares Outstanding, Stock Options |  | 2,026 | 2,454 | 2,734
Vested and expected to vest, Number of Shares Outstanding, Stock Options |  | 2,004 | 2,420 |
Exercisable, Ending balance, Number of Shares Outstanding, Stock Options |  | 1,766 | 1,914 |
Beginning balance, Weighted Average Exercise Price, Stock Options |  | $ 12.51 | $ 11.75 |
Granted, Weighted Average Exercise Price, Stock Options |  | 20.22 | 16.74 |
Exercised, Weighted Average Exercise Price, Stock Options |  | 9.61 | 16.66 |
Cancelled or forfeited, Weighted Average Exercise Price, Stock Options |  | 19.08 | 8.47 |
Ending balance, Weighted Average Exercise Price, Stock Options |  | 13.30 | 12.51 | $ 11.75
Vested and expected to vest, Weighted Average Exercise Price, Stock Options |  | 13.23 | 12.42 |
Exercisable, Ending balance, Weighted Average Exercise Price, Stock Options |  | $ 12.48 | $ 11.01 |
Outstanding, Ending balance, Weighted Average Remaining Contractual Term, Stock Options |  | 5 years 7 months 13 days | 6 years 7 days |
Vested and expected to vest, Weighted Average Remaining Contractual Term, Stock Options |  | 5 years 6 months 29 days | 5 years 11 months 27 days |
Exercisable, Ending balance, Weighted Average Remaining Contractual Term, Stock Options |  | 5 years 2 months 12 days | 5 years 4 months 24 days |
Outstanding, Ending balance, Aggregate Intrinsic Value, Stock Options |  | $ 11,730 | $ 18,295 |
Vested and expected to vest, Aggregate Intrinsic Value, Stock Options |  | 11,717 | 18,228 |
Exercisable, Ending balance, Aggregate Intrinsic Value, Stock Options |  | $ 11,471 | $ 16,897 |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Beginning balance, Number of Shares Outstanding |  | 1,416 | 1,071 |
Awarded, Number of Shares Outstanding |  | 771 | 710 |
Released, Number of Shares Outstanding |  | (331) | (295) |
Forfeited, Number of Shares Outstanding |  | (11) | (70) |
Ending balance, Number of Shares Outstanding |  | 1,845 | 1,416 | 1,071
Beginning balance, Weighted Average Grant Date Fair Value |  | $ 17.40 | $ 17.30 |
Awarded, Weighted Average Grant Date Fair Value |  | 19.38 | 16.35 | $ 17.82
Released, Weighted Average Grant Date Fair Value |  | 17.43 | 14.49 |
Forfeited, Weighted Average Grant Date Fair Value |  | 18.52 | 17.31 |
Ending balance, Weighted Average Grant Date Fair Value |  | $ 18.22 | $ 17.40 | $ 17.30
Performance Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Beginning balance, Number of Shares Outstanding, Stock Options |  | 450 | 450 |
Granted, Number of Shares Outstanding, Stock Options |  |  |  |
Exercised, Number of Shares Outstanding, Stock Options |  |  |  |
Cancelled or forfeited, Number of Shares Outstanding, Stock Options |  |  |  |
Ending balance, Number of Shares Outstanding, Stock Options |  | 450 | 450 | 450
Exercisable, Ending balance, Number of Shares Outstanding, Stock Options |  | 250 | 250 |
Awarded, Number of Shares Outstanding | 450 |  |  |
Beginning balance, Weighted Average Exercise Price, Stock Options |  | $ 13.48 | $ 13.48 |
Granted, Weighted Average Exercise Price, Stock Options |  |  |  |
Exercised, Weighted Average Exercise Price, Stock Options |  |  |  |
Cancelled or forfeited, Weighted Average Exercise Price, Stock Options |  |  |  |
Ending balance, Weighted Average Exercise Price, Stock Options |  | 13.48 | 13.48 | $ 13.48
Exercisable, Ending balance, Weighted Average Exercise Price, Stock Options |  | $ 13.48 | $ 13.48 |
Outstanding, Ending balance, Weighted Average Remaining Contractual Term, Stock Options |  | 5 years 5 months 12 days | 6 years 5 months 12 days |
Exercisable, Ending balance, Weighted Average Remaining Contractual Term, Stock Options |  | 5 years 5 months 12 days | 6 years 5 months 12 days |
Outstanding, Ending balance, Aggregate Intrinsic Value, Stock Options |  | $ 2,774 | $ 3,074 |
Exercisable, Ending balance, Aggregate Intrinsic Value, Stock Options |  | $ 1,541 | $ 1,708 |

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options released weighted average grant date fair value. + References No definition available. + Details
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- 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition 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). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options 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 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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