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Long-term Equity-based Compensation Plans Schedule of Nonvested Restricted Stock Units Activity (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
Time Vested Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted Stock, Nonvested at Beginning of Year, Number | 53,095 |
Restricted Stock, Nonvested at Beginning of Year, Weighted Average Grant Date Fair Value | $ 32.42 |
Restricted Stock, Grants in Period | 0 |
Restricted Stock, Weighted Average Grant Date Fair Value | $ 0.00 |
Restricted Stock, Vested in Period | (500) |
Restricted Stock, Vested in Period, Weighted Average Grant Date Fair Value | $ 29.02 |
Restricted Stock, Forfeited in Period | (4,814) |
Restricted Stock, Forfeitures, Weighted Average Grant Date Fair Value | $ 29.39 |
Restricted Stock, Nonvested at End of Period, Number | 47,781 |
Restricted Stock, Nonvested at End of Period, Weighted Average Grant Date Fair Value | $ 32.73 |
Time Vested Restricted Stock Units [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted Stock, Nonvested at Beginning of Year, Number | 30,024 |
Restricted Stock, Nonvested at Beginning of Year, Weighted Average Grant Date Fair Value | $ 36.60 |
Restricted Stock, Grants in Period | 67,375 |
Restricted Stock, Weighted Average Grant Date Fair Value | $ 36.65 |
Restricted Stock, Vested in Period | 0 |
Restricted Stock, Vested in Period, Weighted Average Grant Date Fair Value | $ 0.00 |
Restricted Stock, Forfeited in Period | (1,775) |
Restricted Stock, Forfeitures, Weighted Average Grant Date Fair Value | $ 36.13 |
Restricted Stock, Nonvested at End of Period, Number | 95,624 |
Restricted Stock, Nonvested at End of Period, Weighted Average Grant Date Fair Value | $ 36.64 |
Performance Based Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted Stock, Nonvested at Beginning of Year, Number | 110,625 |
Restricted Stock, Nonvested at Beginning of Year, Weighted Average Grant Date Fair Value | $ 39.28 |
Restricted Stock, Grants in Period | 0 |
Restricted Stock, Weighted Average Grant Date Fair Value | $ 0.00 |
Restricted Stock, Vested in Period | 0 |
Restricted Stock, Vested in Period, Weighted Average Grant Date Fair Value | $ 0.00 |
Restricted Stock, Forfeited in Period | (59,225) |
Restricted Stock, Forfeitures, Weighted Average Grant Date Fair Value | $ 36.81 |
Restricted Stock, Nonvested at End of Period, Number | 51,400 |
Restricted Stock, Nonvested at End of Period, Weighted Average Grant Date Fair Value | $ 42.12 |
Performance Period | 3 years |
Performance Based Restricted Stock Units [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted Stock, Nonvested at Beginning of Year, Number | 61,875 |
Restricted Stock, Nonvested at Beginning of Year, Weighted Average Grant Date Fair Value | $ 40.50 |
Restricted Stock, Grants in Period | 68,825 |
Restricted Stock, Weighted Average Grant Date Fair Value | $ 43.05 |
Restricted Stock, Vested in Period | 0 |
Restricted Stock, Vested in Period, Weighted Average Grant Date Fair Value | $ 0.00 |
Restricted Stock, Forfeited in Period | (1,800) |
Restricted Stock, Forfeitures, Weighted Average Grant Date Fair Value | $ 41.49 |
Restricted Stock, Nonvested at End of Period, Number | 128,900 |
Restricted Stock, Nonvested at End of Period, Weighted Average Grant Date Fair Value | $ 41.85 |
Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted Stock, Vested in Period, Total Fair Value |  | $ 2.4
Restricted Stock, Vested in Period, Tax Benefits |  | $ 0.8
Performance Period, 2015 to 2017 [Member] | Performance Based Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of Additional Shares To Be Granted If Maximum Perfornance Level Is Met or Exceeded | 68,125 |
Performance Period, 2014 to 2016 [Member] | Performance Based Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of Additional Shares To Be Granted If Maximum Perfornance Level Is Met or Exceeded | 60,775 |
Performance Period, 2013 to 2015 [Member] | Performance Based Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of Additional Shares To Be Granted If Maximum Perfornance Level Is Met or Exceeded | 51,400 |
Performance Period, 2012 to 2014 [Member] | Performance Based Restricted Stock [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock Issued During Period, Shares, Share-based Compensation, Forfeited | 57,775 |

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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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