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Share Based and Deferred Compensation (Details Textuals) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2010 | Mar. 02, 2011 Executive Officer [Member] Restricted Share Awards [Member] | May 24, 2011 Executive Officer [Member] Stock Option [Member] | Mar. 02, 2011 Executive Officer [Member] Stock Option [Member] | Mar. 02, 2011 Executive Officer [Member] Restricted Performance Share Units Plan [Member] | Mar. 04, 2010 Executive Officer [Member] Restricted Performance Share Units Plan [Member] | Apr. 01, 2009 Executive Officer [Member] Restricted Performance Share Units Plan [Member] | Mar. 31, 2011 Stock Option [Member] | Jun. 30, 2011 Stock Option [Member] | Jun. 30, 2010 Stock Option [Member] | Jun. 30, 2011 Stock Option [Member] | Jun. 30, 2010 Stock Option [Member] | Mar. 31, 2011 Restricted Share Awards [Member] | Jun. 30, 2011 Restricted Share Awards [Member] | Jun. 30, 2010 Restricted Share Awards [Member] | Jun. 30, 2011 Restricted Share Awards [Member] | Jun. 30, 2010 Restricted Share Awards [Member] | Dec. 31, 2010 Restricted Share Awards [Member] | Mar. 31, 2011 Restricted Performance Share Units Plan [Member] | Jun. 30, 2011 Restricted Performance Share Units Plan [Member] | Jun. 30, 2010 Restricted Performance Share Units Plan [Member] | Jun. 30, 2011 Restricted Performance Share Units Plan [Member] | Jun. 30, 2010 Restricted Performance Share Units Plan [Member] | Jun. 30, 2009 Restricted Performance Share Units Plan [Member] | Jun. 30, 2011 Outperformance Program [Member] | Jun. 30, 2010 Outperformance Program [Member] | Jun. 30, 2011 Outperformance Program [Member] | Jun. 30, 2010 Outperformance Program [Member] | Jun. 30, 2011 Employee Share Purchase Plan [Member] | Jun. 30, 2010 Employee Share Purchase Plan [Member] | Jun. 30, 2011 Employee Share Purchase Plan [Member] | Jun. 30, 2010 Employee Share Purchase Plan [Member] | Jun. 30, 2011 Deferred Compensation Plan [Member] | Jun. 30, 2010 Deferred Compensation Plan [Member]
Share Based and Deferred Compensation (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding under equity incentive plan | 3,642,965 |  | 3,642,965 |  | 3,116,611 |  |  |  |  |  |  |  | 3,642,965 |  | 3,642,965 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested options |  |  |  |  |  |  |  |  |  |  |  |  | 1,311,943 |  | 1,311,943 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expenses |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.1 |  | $ 3.1 |  |  | $ 5.1 |  | $ 5.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average period over which options will be recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.0 |  |  |  |  | 1.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense recognized | 1.6 | 1.8 | 3.3 | 3.1 |  |  |  |  |  |  |  |  | 0.4 | 0.3 | 0.7 | 0.5 |  | 0.8 | 1.0 | 1.6 | 1.8 |  |  | 0.5 | 0.3 | 0.8 | 0.5 |  | 0.1 | 0.1 | 0.1 | 0.2 | 0.1 | 0.2 | 0.1 | 0.2 |  |
Restricted shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 808,763 |  | 808,763 |  | 851,278 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | over three years |  | after three years from the grant date |  |  | three to seven years from initial grant date |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Expiration Dating |  |  | 10 Years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Capitalized Amount | 0.4 | 0.4 | 0.7 | 0.6 |  |  |  |  |  |  |  |  | 0.1 |  | 0.2 |  |  | 0.1 | 0.2 | 0.3 | 0.4 |  |  | 0.1 |  | 0.2 |  |  |  |  |  |  |  |  |  |  |  |
Aggregate share-based awards awarded to executives |  |  |  |  |  | 174,012 | 101,437 | 603,241 | 124,293 | 120,955 | 488,292 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,250,000 |  | 1,250,000 |  |  |
Voluntary termination of employment Terms |  |  |  |  |  |  |  |  |  |  |  | after reaching age 57 and accumulating at least 15 years of service with the Company |  |  |  |  | after reaching age 57 and accumulating at least 15 years of service with the Company |  |  |  |  |  | after reaching age 57 and accumulating at least 15 years of service with the Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares to be delivered at the end of the measurement period relative to the total shareholder return |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | equal a certain percentage (not to exceed 200%) of the participant’s base units |  |  |  |  |  |  |  |  |  |  |  |
Fair value of awards on the grant date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.0 | 2.0 | 1.1 |  |  | 5.9 |  |  |  |  |  |  |
Share purchases made by employees under ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85% of the average closing price per share for a specified period |  |  |
Maximum participant contribution under 2011 plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | limited to the lesser of 20% of compensation or $50,000 |  |  |
Purchase price of shares purchased under ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.1 | 0.2 | 0.2 | 0.3 |  |
Net increase in compensation costs due to change in market value of participant investment in plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.4 | 0.2
Net decrease in compensation costs due to change in market value of participant investment in plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.4 | $ 0.2
Number of shares to be issued under deferred compensation plan included in total shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 | 300,000

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- Definition Represents the expense recognized during the period arising from share-based compensation arrangements (for example, shares of stock, 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b 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) Reference 3: 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 As of the latest balance-sheet date presented, the total compensation cost related to outstanding, nonvested share-based compensation awards not yet recognized (will be charged against earnings as services are performed or other vesting criteria are met). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h + Details
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- Definition Reflects the dating as to when the share-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a + Details
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- Definition Description of the period of time over 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, which may be expressed in a variety of ways (for example, in years, month and year). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a + Details
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- Definition The number of outstanding awards on nonstock option plans (for example, phantom stock plan, stock 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(a) 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)(b) + Details
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- Definition The total fair value of share-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) + Details
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- Definition The maximum number of shares originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the share-based compensation plan. As stock options and equity instruments other than options are awarded to participants, the shares 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a + Details
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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance-sheet date, including vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) + 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(2) + Details
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- Definition The average of prices paid for shares purchased on the open market for issuance to employees under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 + Details
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