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Stock Option Plans and Share-Based Compensation PSU performance to vesting table by Program year (Details) (USD $) |  | 3 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2014 Performance Shares [Member] | Dec. 31, 2013 Performance Shares [Member] | Mar. 31, 2014 Employee Stock [Member] | Dec. 31, 2014 Below the 35th percentile ranking [Member] PSU Program Year Three [Domain] Performance Shares [Member] | Dec. 31, 2014 Below 50th percentile ranking [Member] PSU Program Year Three [Domain] Performance Shares [Member] | Dec. 31, 2014 At least 50th percentile (after yr one) [Member] PSU Program Year Three [Domain] Performance Shares [Member] | Mar. 31, 2014 Minimum [Member] Below the 75th percentile ranking [Member] PSU program year one [Member] Performance Shares [Member] | Mar. 31, 2014 Maximum [Member] Below the 75th percentile ranking [Member] PSU program year one [Member] Performance Shares [Member] | Jan. 22, 2013 2012 PSU [Member] Performance Shares [Member] | Dec. 31, 2012 2012 PSU [Member] Performance Shares [Member] | Mar. 20, 2014 2013 PSU [Member] Performance Shares [Member] | Mar. 31, 2014 2013 PSU [Member] Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentile Ranking of 2012 Shareholder Return |  |  |  |  |  |  |  |  |  | 35.30% |  |  |
Shares, Issued |  |  |  | 4,484,664 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  | 323,000 | 225,000 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value |  | $ 14.41 | $ 13.32 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 132,000 |  |  |  |  |  |  |  |  | 125,000 |  | 132,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 16.59 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |  | (34,000) |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value |  | $ 14.81 |  |  |  |  |  |  |  |  |  |  |
PSU percentage eligible for time-based vesting |  |  |  |  | 0.00% | 50.00% | 100.00% | 110.00% | 119.00% |  |  |  |
PSU percentage eligible for vesting based on actual return |  |  |  |  |  |  |  |  |  | 50.00% |  | 100.00% |
PSU shares eligible for vesting based on actual shareholder return |  |  |  |  |  |  |  |  |  | 62,500 |  | 137,500 |
Share-based Compensation Arrangement by Share-based Payment Award, First Year Share Vesting Rate |  |  |  |  |  |  |  |  |  | 25.00% |  | 25.00% |
Percentile Ranking of 2013 Shareholder Return |  |  |  |  |  |  |  |  |  |  |  | 63.94% |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |  | 0 |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value |  | $ 0.00 |  |  |  |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 2,457,760 |  |  | 846,891 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period |  |  |  | 254,009 |  |  |  |  |  |  |  |  |

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- Definition Percentile Ranking of 2013 Shareholder Return = the actual percentile ranking for our entity among the health care stock index companies for calendar 2013 total shareholder return + References No definition available. + Details
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- Definition PSU percentage eligible for time-based vesting = the percentage of the original PSU award which will continue with service-based vesting based on the percentile ranking against total stock performance in the reference year for the health care index. + References No definition available. + Details
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- Definition PSU percentage eligible for vesting based on actual return = percentage of original PSU awards that continue under service-based vesting, based on percentile performance in the grant year for Total Shareholder Return + References No definition available. + Details
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- Definition PSU shares eligible for vesting based on actual shareholder return = No. of PSU shares that continue with service-based vesting, based on percentile performance of Total shareholder return in the calendar year of grant. + References No definition available. + Details
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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 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 Number of share instruments newly issued under a share-based compensation 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares of stock issued as of the balance sheet date, including shares that had been issued and were previously outstanding but which are now held in the treasury. + References Reference 1: 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 + Details
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