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Stock-Based Incentive Plans (Details) (USD $) | 9 Months Ended | 12 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended
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Sep. 30, 2013 plan | Sep. 30, 2012 | Dec. 31, 2012 | Feb. 06, 2013 Restricted Stock Units | Sep. 30, 2013 Restricted Stock Units | Sep. 30, 2012 Restricted Stock Units | Feb. 06, 2013 Restricted Stock Units Restrictions lapse (awards vest) on date of award | Feb. 06, 2013 Restricted Stock Units Restrictions lapse (awards vest) on first, second and third anniversaries of the date of the award | Sep. 30, 2013 Non-Qualified Stock Options | Sep. 30, 2013 Unvested Stock Options | Feb. 06, 2013 Non Employee Directors Restricted Stock Units
Stock-Based Incentive Plans |  |  |  |  |  |  |  |  |  |  |
Number of stock-based incentive plans | 1 |  |  |  |  |  |  |  |  |  |
Number of stock option plans superseded | 2 |  |  |  |  |  |  |  |  |  |
Restricted stock unit activity |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  |  |  | 264,000 |  |  |  |  |  |
Awarded (in shares) |  |  |  | 359,371 | 359,000 |  |  |  |  |  | 9,975
Vested (in shares) |  |  |  |  | (174,000) |  |  |  |  |  |
Forfeited (in shares) |  |  |  |  | (1,000) |  |  |  |  |  |
Outstanding at the end of the period (in shares) |  |  |  |  | 448,000 |  |  |  |  |  |
Outstanding and expected to vest at the end of the period (in shares) |  |  |  |  | 436,000 |  |  |  |  |  |
Weighted-Average Exercise Price |  |  |  |  |  |  |  |  |  |  |
Awarded (in dollars per share) |  |  |  | $ 31.96 |  |  |  |  |  |  |
Outstanding and expected to vest at the end of the period (in dollars per share) |  |  |  |  | $ 32.45 |  |  |  |  |  |
Weighted-Average Remaining Contractual Life |  |  |  |  |  |  |  |  |  |  |
Outstanding and expected to vest at end of the period |  |  |  |  |  |  |  |  | 3 years 10 months 24 days |  |
Exercisable at end of the period |  |  |  |  |  |  |  |  | 3 years 8 months 12 days |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |
Closing price per share (in dollars per share) |  |  |  |  | $ 32.57 |  |  |  |  |  |
Total intrinsic value of awards vested (in dollars) |  |  |  |  | $ 5,700,000 | $ 3,100,000 |  |  |  |  |
Non-Qualified Stock Options activity |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  |  |  |  |  |  |  | 1,907,000 |  |
Exercised (in shares) |  |  |  |  |  |  |  |  | (193,000) |  |
Forfeited (in shares) |  |  |  |  |  |  |  |  | (374,000) |  |
Outstanding at the end of the period (in shares) |  |  |  |  |  |  |  |  | 1,340,000 |  |
Outstanding and expected to vest at the end of the period (in shares) |  |  |  |  |  |  |  |  | 1,317,000 |  |
Exercisable at the end of the period (in shares) |  |  |  |  |  |  |  |  | 819,000 |  |
Weighted-Average Exercise Price |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  |  |  | $ 33.23 |  |  |  | $ 31.58 |  |
Outstanding at the end of the period (in dollars per share) |  |  |  |  | $ 32.45 |  |  |  | $ 29.63 |  |
Outstanding and expected to vest at end of the period (in dollars per share) |  |  |  |  |  |  |  |  | $ 29.63 |  |
Exercisable at end of the period (in dollars per share) |  |  |  |  |  |  |  |  | $ 29.67 |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars) |  |  |  |  | 14,585,000 |  |  |  | 4,057,000 |  |
Outstanding and expected to vest at end of the period (in dollars) |  |  |  |  | 14,207,000 |  |  |  | 3,988,000 |  |
Vesting rights percentage when restrictions lapse |  |  |  |  |  |  | 25.00% | 25.00% |  |  |
Exercisable at end of the period (in dollars) |  |  |  |  |  |  |  |  | 2,488,000 |  |
Closing price of share (in dollars per share) |  |  |  |  |  |  |  |  | $ 32.57 |  |
Total intrinsic value of options exercised (in dollars) | 900,000 | 800,000 |  |  |  |  |  |  |  |  |
Granted (in shares) | 0 |  | 0 |  |  |  |  |  |  |  |
Number of Shares, Unvested Stock Options |  |  |  |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in shares) |  |  |  |  |  |  |  |  |  | 826,000 |
Vested (in shares) |  |  |  |  |  |  |  |  |  | (304,000) |
Forfeited (in shares) |  |  |  |  |  |  |  |  |  | (1,000) |
Unvested at the end of the period (in shares) |  |  |  |  |  |  |  |  |  | 521,000 |
Weighted-Average Grant-Date Fair Value, Unvested Stock Options |  |  |  |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 10.25 |
Vested (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 10.18 |
Forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 10.33 |
Unvested at the end of the period (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 10.29 |
Unrecognized compensation cost and vesting period |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs related to unvested share-based compensation arrangements | $ 11,000,000 |  |  |  |  |  |  |  |  |  |
Weighted-average period for recognition of unrecognized stock-based compensation expense | 1 year 9 months 18 days |  |  |  |  |  |  |  |  |  |

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- Definition The intrinsic value of nonvested awards on equity-based plans excluding option plans for nonvested awards outstanding and expected to vest at the end of the period. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options. + 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=6415400&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=6415400&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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&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://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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest options outstanding, 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 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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