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Stock-Based Compensation (Details) (USD $) | 6 Months Ended |  | 6 Months Ended | 1 Months Ended |  |  | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Jun. 30, 2014 Stock Options [Member] | Jun. 30, 2014 Restricted Stock [Member] | Jun. 30, 2013 Restricted Stock [Member] | Jun. 30, 2014 Market-Based Shares [Member] | Jun. 30, 2013 Market-Based Shares [Member] | Feb. 28, 2014 Executive [Member] Performance Shares [Member] | Jun. 30, 2014 Executive [Member] Performance Shares [Member] | Mar. 31, 2012 Achieves a specified improvement in total shareholder return at the end of 2016 compared to 2011 and she remains an employee [Member] Common Stock [Member] Chairman, President, and Chief Executive Officer [Member] | Mar. 31, 2012 Achieves a specified improvement in total shareholder return at the end of 2014 compared to 2011 and she remains an employee [Member] Common Stock [Member] Chairman, President, and Chief Executive Officer [Member] | Jun. 30, 2014 Performance Equity Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  |  |  |  |  | 3 years
Share-based Compensation Arrangement by Share-based Payment Award, Vesting Rate |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized | $ 7,700,000 |  | $ 4,600,000 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Options, Outstanding at beginning of period, Shares | 1,343,666 |  |  |  |  |  |  |  |  |  |  |  |
Options, Outstanding at beginning of period, Weighted-Average Exercise Price (in dollars per share) | $ 20.63 |  |  |  |  |  |  |  |  |  |  |  |
Options, Granted, Shares | 0 |  |  |  |  |  |  |  |  |  |  |  |
Options, Granted, Weighted-Average Exercise Price (in dollars per share) | $ 0.00 |  |  |  |  |  |  |  |  |  |  |  |
Options, Exercised, Shares | (236,260) |  |  |  |  |  |  |  |  |  |  |  |
Options, Exercised, Weighted-Average Exercise Price (in dollars per share) | $ 18.90 |  |  |  |  |  |  |  |  |  |  |  |
Options, Forfeited, Shares | (17,151) |  |  |  |  |  |  |  |  |  |  |  |
Options, Forfeited, Weighted-Average Exercise Price (in dollars per share) | $ 26.43 |  |  |  |  |  |  |  |  |  |  |  |
Options, Expired, Shares | (22,784) |  |  |  |  |  |  |  |  |  |  |  |
Options, Expired, Weighted-Average Exercise Price (in dollars per share) | $ 25.91 |  |  |  |  |  |  |  |  |  |  |  |
Options, Outstanding at end of period, Shares | 1,067,471 |  |  |  |  |  |  |  |  |  |  |  |
Options, Outstanding at end of period, Weighted-Average Exercise Price (in dollars per share) | $ 20.80 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Nonvested Restricted Stock, Nonvested at beginning of period, Shares |  |  |  |  | 315,305 |  |  |  |  |  |  |  |
Nonvested Restricted Stock, Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  |  |  | $ 17.87 |  |  |  |  |  |  |  |
Nonvested Restricted Stock, Granted, Shares |  |  |  |  | 242,164 |  |  |  |  |  |  |  |
Nonvested Restricted Stock, Granted, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  |  |  | $ 21.27 | $ 20.03 |  |  |  |  |  |  |
Nonvested Restricted Stock, Vested, Shares |  |  |  |  | (292,052) |  |  |  |  |  |  |  |
Nonvested Restricted Stock, Vested, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  |  |  | $ 16.64 |  |  |  |  |  |  |  |
Nonvested Restricted Stock, Forfeited, Shares |  |  |  |  | 0 |  |  |  |  |  |  |  |
Nonvested Restricted Stock, Forfeited, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  |  |  | $ 0.00 |  |  |  |  |  |  |  |
Nonvested Restricted Stock, Nonvested at end of period, Shares |  |  |  |  | 265,417 |  |  |  |  |  |  |  |
Nonvested Restricted Stock, Nonvested at end of period, Weighted-Average Grant-Date Fair Value (in dollars per share) |  |  |  |  | $ 22.31 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Options, Outstanding at end of period, Aggregate Intrinsic Value |  |  |  | 9,400,000 |  |  |  |  |  |  |  |  |
Options, Outstanding at end of period, Weighted-Average Remaining Contract Life (years) |  |  |  | 3 years 2 months 13 days |  |  |  |  |  |  |  |  |
Options, Outstanding at end of period, No intrinsic value | 297,350 |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value options granted (dollars per share) | $ 0.00 | $ 0.00 |  |  |  |  |  |  |  |  |  |  |
Total fair value of options that vested | 0 | 625,000 |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised | 1,779,000 | 2,189,000 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total fair value of shares that vested |  |  |  |  | $ 4,854,000 | $ 4,383,000 |  |  |  |  |  |  |
Expected quarterly dividends per share |  |  |  |  | $ 0.185 | $ 0.165 |  |  |  |  |  |  |
Risk-free interest rate |  |  |  |  | 0.62% | 0.34% | 0.64% | 0.36% |  |  |  |  |
Granted and Vested in Period |  |  |  |  |  |  |  |  | 112,864 |  |  |  |
Share based Compensation, weighted percentage assigned to achieving market targets |  |  |  |  |  |  |  |  | 60.00% |  |  |  |
Share based Compensation, weighted percentage assigned to achieving performance targets |  |  |  |  |  |  |  |  | 40.00% |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year One |  |  |  |  |  |  |  |  |  | 198,369 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year Two |  |  |  |  |  |  |  |  |  | 179,811 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year Three |  |  |  |  |  |  |  |  |  | 175,735 |  |  |
Shares received if achieves specified improvement in total shareholders return |  |  |  |  |  |  |  |  |  |  | 135,000 | 35,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  |  |  |  |  |  | 2.82% | 2.86% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate |  |  |  |  |  |  | 25.11% | 25.11% |  |  |  |  |

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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 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 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 Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 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 estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own 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 (f)(2)(iv) -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 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 Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(4) -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 The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(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 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 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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