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Share-Based Compensation (Details 2) (USD $) | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2012 | Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2013 Restricted Shares | Dec. 31, 2012 Restricted Shares | Dec. 31, 2013 Performance Unit Awards | Dec. 31, 2013 Restricted stock units | Dec. 31, 2012 Restricted stock units | Dec. 31, 2013 Restricted stock units Executive Officer | Dec. 31, 2013 Long-Term Incentive Plan | Dec. 31, 2013 Long-Term Incentive Plan Stock Options | Dec. 31, 2012 Long-Term Incentive Plan Stock Options | Dec. 31, 2011 Long-Term Incentive Plan Stock Options | Dec. 31, 2010 Long-Term Incentive Plan Stock Options | Dec. 31, 2013 Long-Term Incentive Plan Restricted Shares | Dec. 31, 2012 Long-Term Incentive Plan Restricted Shares | Dec. 31, 2011 Long-Term Incentive Plan Restricted Shares | Dec. 31, 2010 Long-Term Incentive Plan Restricted Shares | Dec. 31, 2012 Long-Term Incentive Plan Restricted Stock
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock authorized for issuance (in shares) |  |  |  |  |  |  |  |  |  | 7,500,000 | 1,000,000 |  |  |  |  |  |  |  |
Shares available for issuance |  |  |  |  |  |  |  |  |  | 6,787,341 |  |  |  |  |  |  |  |  |
Non-vested shares activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested at the beginning of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,145,611 | 1,634,154 | 1,369,182 |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,600 | 318,508 | 826,959 |  |
Vested (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (709,959) | (740,811) | (557,355) |  |
Forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (78,700) | (66,240) | (4,632) |  |
Non-vested at the end of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 359,552 | 1,145,611 | 1,634,154 |  |
Weighted-Average Grant-Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23.24 | $ 14.61 | $ 10.94 |  |
Granted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 54.75 | $ 43.66 | $ 18.79 |  |
Vested (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18.73 | $ 13.59 | $ 11.83 |  |
Forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 42.80 | $ 16.54 | $ 8.67 |  |
Non-vested at the end of the period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 28.09 | $ 23.24 | $ 14.61 |  |
Stock option activity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at the beginning of the period (in shares) |  |  |  |  |  |  |  |  |  |  | 0 | 22,900 | 22,900 |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |  |
Exercised (in shares) | (22,900) |  |  |  |  |  |  |  |  |  |  | (22,900) | 0 |  |  |  |  |  |
Forfeited (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
Expired (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |
Options outstanding at the end of the period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0 | 22,900 | 22,900 |  |  |  |  |
Weighted-Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding at the beginning of the period (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.00 | $ 18.03 | $ 18.03 |  |  |  |  |  |
Granted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.00 | $ 0.00 |  |  |  |  |  |
Exercised (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.00 | $ 0.00 |  |  |  |  |  |
Forfeited (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.00 | $ 0.00 |  |  |  |  |  |
Expired (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.00 | $ 0.00 |  |  |  |  |  |
Options outstanding at the end of the period (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.00 | $ 18.03 | $ 18.03 |  |  |  |  |
Weighted-Average Remaining Contractual Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,600,000 | $ 55,900,000 | $ 30,600,000 | $ 20,800,000 |
Options outstanding at the end of the period |  |  |  |  |  |  |  |  |  |  |  |  | 7 years 4 months 6 days | 8 years 4 months 6 days |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 3 years | 3 years | 1 year |  |  |  |  |  | 3 years |  |  |  |
Number of shares right to receive cash payment on vesting equal to fair market value is received per award |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Portion of stock awards vested per year for Company employees |  |  |  |  |  |  |  | 0.3333 |  |  |  |  |  |  |  |  |  |  |
Offer price per share received as cash settlement on restricted stock awards vested in 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30.00 |  |  |
Number of non-transferable contingent cash payments right for each restricted stock awards vested in 2012 (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Additional share based compensation incurred on modification of awards |  | 9,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,400,000 |  |  |
Unrecognized compensation cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,900,000 |  |  |
Weighted-average period for amortization of unrecognized compensation cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 2 months 12 days
Compensation expense |  |  |  |  |  | 3,900,000 |  |  |  |  | 0 | 0 | 8,000 |  | 13,200,000 | 36,900,000 | 9,800,000 |  |
Liability for unvested restricted share awards |  | 51,200,000 | 45,800,000 | 8,900,000 | 19,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid to settle liability-classified awards upon vesting |  |  |  | $ 23,800,000 | $ 22,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the portion of stock awards for employees vested per year. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -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 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 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=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 Amount of liabilities paid for share-based compensation. + 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 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 The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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 The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 Gross number of share options (or share units) granted during the period. + References No definition available. + 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 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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards 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 An excess of the fair value of the modified award over the fair value of the award immediately before the modification. + 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 (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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