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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
--- | --- | --- | --- | --- | ---
Sep. 30, 2014 plan | Sep. 30, 2013 | Dec. 31, 2013 | Feb. 03, 2014 Restricted Stock Units | Sep. 30, 2014 Restricted Stock Units | Sep. 30, 2013 Restricted Stock Units | Sep. 30, 2014 Non-Qualified Stock Options | Sep. 30, 2014 Unvested Stock Options | Feb. 03, 2014 Non Employee Directors Restricted Stock Units
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |
Number of stock-based incentive plans | 1 |  |  |  |  |  |  |  |  |  |
Number of stock option plans superseded | 2 |  |  |  |  |  |  |  |  |  |
Awarded (in dollars per share) |  |  |  | $ 30.98 |  |  |  |  |  |  |
Restricted stock unit activity |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  |  |  | 448,000 |  |  |  |  |  |
Awarded (in shares) |  |  |  | 342,950 | 343,000 |  |  |  |  |  | 9,975
Vested (in shares) |  |  |  |  | (282,000) |  |  |  |  |  |
Forfeited (in shares) |  |  |  |  | (1,000) |  |  |  |  |  |
Outstanding at the end of the period (in shares) |  |  |  |  | 508,000 |  |  |  |  |  |
Outstanding and expected to vest at the end of the period (in shares) |  |  |  |  | 497,000 |  |  |  |  |  |
Weighted-Average Exercise Price |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  |  |  | $ 32.45 |  |  | $ 29.35 |  |  |
Outstanding at the end of the period (in dollars per share) |  |  |  |  | $ 31.67 |  |  | $ 29.39 |  |  |
Outstanding and expected to vest at end of the period (in dollars per share) |  |  |  |  |  |  |  | $ 29.39 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term |  |  |  |  |  |  |  | 3 years 3 months 18 days |  |  |
Exercisable at end of the period (in dollars per share) |  |  |  |  |  |  |  | $ 29.33 |  |  |
Weighted-Average Exercise Price |  |  |  |  |  |  |  |  |  |  |
Outstanding and expected to vest at the end of the period (in dollars per share) |  |  |  |  | $ 31.68 |  |  |  |  |  |
Granted (in shares) | 0 |  | 0 |  |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars) |  |  |  |  | $ 14,817,000 | [1] |  | $ 212,000 | [2] |  |
Outstanding and expected to vest at end of the period (in dollars) |  |  |  |  | 14,473,000 | [1] |  | 212,000 | [2] |  |
Exercisable at end of the period (in dollars) |  |  |  |  |  |  |  | 212,000 | [2] |  |
Total intrinsic value of options exercised (in dollars) | 700,000 | 900,000 |  |  |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of awards vested (in dollars) |  |  |  |  | 9,000,000 |  | 5,700,000 |  |  |  |
Closing price per share (in dollars per share) |  |  |  |  | $ 29.15 |  |  |  |  |  |
Non-Qualified Stock Options activity |  |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  |  |  |  |  |  | 1,021,000 |  |  |
Exercised (in shares) |  |  |  |  |  |  |  | (144,000) |  |  |
Forfeited (in shares) |  |  |  |  |  |  |  | (5,000) |  |  |
Outstanding at the end of the period (in shares) |  |  |  |  |  |  |  | 872,000 |  |  |
Outstanding and expected to vest at the end of the period (in shares) |  |  |  |  |  |  |  | 864,000 |  |  |
Exercisable at the end of the period (in shares) |  |  |  |  |  |  |  | 710,000 |  |  |
Weighted-Average Remaining Contractual Life |  |  |  |  |  |  |  |  |  |  |
Exercisable at end of the period |  |  |  |  |  |  |  | 3 years 2 months 12 days |  |  |
Number of Shares, Unvested Stock Options |  |  |  |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in shares) |  |  |  |  |  |  |  |  |  | 448,000 |
Vested (in shares) |  |  |  |  |  |  |  |  |  | (285,000) |
Forfeited (in shares) |  |  |  |  |  |  |  |  |  | (1,000) |
Unvested at the end of the period (in shares) |  |  |  |  |  |  |  |  |  | 162,000 |
Weighted-Average Grant-Date Fair Value, Unvested Stock Options |  |  |  |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 10.31 |
Vested (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 10.30 |
Forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 10.33 |
Unvested at the end of the period (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 10.33 |
Unrecognized compensation cost and vesting period |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation costs related to unvested share-based compensation arrangements | $ 16,700,000 |  |  |  |  |  |  |  |  |  |
Weighted-average period for recognition of unrecognized stock-based compensation expense | 1 year 9 months 11 days |  |  |  |  |  |  |  |  |  |
[1] | The intrinsic value is calculated using the closing price per share of $29.15 as reported by the New York Stock Exchange on September 30, 2014.
[2] | The intrinsic value represents the amount, if any, by which the fair market value of the underlying common stock exceeds the exercise price of the stock option, using the closing price per share of $29.15 as reported by the New York Stock Exchange on September 30, 2014.

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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 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 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 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 As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be 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 (e)(1) -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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