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Equity Awards - Restricted Shares Narrative (Details) (USD $) | 3 Months Ended |  | 3 Months Ended | 12 Months Ended
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Mar. 31, 2013 Restricted Shares [Member] | Mar. 31, 2012 Restricted Shares [Member] | Mar. 31, 2013 Restricted Shares [Member] Non-employee independent director [Member] Deferred Compensation, Share-based Payments [Member] | Mar. 31, 2013 Plan 1 [Member] Service-based restriced shares [Member] | Mar. 31, 2013 Plan 2 [Member] Service-based restriced shares [Member] | Mar. 31, 2013 Plan 3 [Member] number | Mar. 31, 2013 Plan 3 [Member] Restricted Shares [Member] | Mar. 31, 2013 Plan 3 [Member] Service-based restriced shares [Member] | Mar. 31, 2013 Plan 3 [Member] Performance-based restriced shares [Member] | Mar. 31, 2013 Plan 5 [Member] Service-based restriced shares [Member] | Mar. 31, 2013 Plan 5 [Member] Service-based restriced shares [Member] Non-employee independent director [Member] | Mar. 31, 2013 Minimum [Member] Plan 2 [Member] Service-based restriced shares [Member] | Mar. 31, 2013 3 year cash flow metric [Member] Plan 3 [Member] Performance-based restriced shares [Member] | Mar. 31, 2013 3 year cash flow metric [Member] Minimum [Member] Plan 3 [Member] Performance-based restriced shares [Member] | Mar. 31, 2013 3 year cash flow metric [Member] Maximum [Member] Plan 3 [Member] Performance-based restriced shares [Member] | Mar. 31, 2013 3 year EPS CAGR metric [Member] Plan 3 [Member] Performance-based restriced shares [Member] | Mar. 31, 2013 3 year EPS CAGR metric [Member] Minimum [Member] Plan 3 [Member] Performance-based restriced shares [Member] | Mar. 31, 2013 3 year EPS CAGR metric [Member] Maximum [Member] Plan 3 [Member] Performance-based restriced shares [Member] | Mar. 31, 2013 2012 EPS growth metric [Member] Plan 4 [Member] Performance-based restriced shares [Member] | Dec. 31, 2012 2012 EPS growth metric [Member] Plan 4 [Member] Performance-based restriced shares [Member] | Dec. 31, 2012 2012 & 2013 EPS CAGR metric [Member] Plan 4 [Member] Performance-based restriced shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares issued related to director fee deferrals |  |  | 1,508 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Unvested Restricted Shares Granted | 401,110 |  |  | 29,498 | 41,480 |  | 238,808 | 119,404,000 | 119,404,000 |  | 17,240 |  |  |  |  |  |  |  | 72,576 |  |
Award requisite service period |  |  |  | 3 years | 1 year |  |  | 3 years |  | 1 year |  |  |  |  |  |  |  |  |  |  |
ICP, Threshold target for granting stock awards |  |  |  |  |  |  |  |  |  |  |  | $ 20,000 |  |  |  |  |  |  |  |  |
Cash value of incentive plan |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restriced shares value of incentive plan |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Award percentage earned based on metric over the performance period |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  | 75.00% |  |  |  | 60.00% | 40.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 175.00% |
Number of performance metrics in restricted shares award type plan |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of shares earned % of target award |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% | 200.00% |  | 30.00% | 250.00% |  |  |
Unrecognized unvested restricted shares-based compensation expense | 11,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average period for recognition of the unrecognized unvested restricted shares-based compensation expense | 1 year 11 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares-based compensation expense | $ 2,700,000 | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained + References No definition available. + Details
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- Definition Award percentage earned based on metric over the performance period. + References No definition available. + Details
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- Definition Percentage of the value of the incentive plan in earned cash. + References No definition available. + Details
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- Definition Incentive Compensation Plan, Threshold Target Award for Granting Stock Award. + References No definition available. + Details
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- Definition Number of performance metrics in restricted shares award type plan. + References No definition available. + Details
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- Definition Percentage of the value of the incentive plan in restriced shares. + 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 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: 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=6793087&loc=d3e301413-122809 + Details
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- Definition The number of shares issued pursuant to the terms of the deferred compensation plan 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 (l) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 65 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Aggregate unrecognized cost of share-based awards, other than options, made to employees under an equity-based compensation plan, that have yet to vest. + References No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 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 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(c) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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