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Benefit Plans (Details) (USD $) | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  |  | 12 Months Ended |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Share Options [Member] | Dec. 31, 2011 Share Options [Member] | Dec. 31, 2010 Share Options [Member] | Dec. 31, 2009 Share Options [Member] | Dec. 31, 2010 2010 Options [Member] | Dec. 31, 2012 2010 Options [Member] | Dec. 31, 2012 2009 Options [Member] years | Jan. 08, 2010 2009 Options [Member] | Dec. 31, 2012 2008 Options [Member] years days | Dec. 31, 2010 2008 Options [Member] | Dec. 31, 2008 2008 Options [Member] | Dec. 31, 2012 Non-vested Shares [Member] | Dec. 31, 2011 Non-vested Shares [Member] | Dec. 31, 2010 Non-vested Shares [Member] | Dec. 31, 2012 Shares Subject to Time [Member] | Dec. 31, 2012 Shares Subject to Performance [Member] | Dec. 31, 2012 Share Based Compensation Arrangement By Share Based Payment Award Vesting Rate First Vesting Trigger [Member] 2008 Options [Member] | Dec. 31, 2012 Minimum [Member] 2008 Options [Member] | Dec. 31, 2012 Maximum [Member] 2008 Options [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,465,446 | 1,179,585 | 819,577 | 1,092,306 | 373,140 |  |  |
Common Share Options Granted |  |  |  |  |  |  |  | 1,248,501 |  |  | 1,265,500 |  |  | 2,000,000 |  |  |  |  |  |  |  |
Common Share Options Exercise Price |  |  |  | $ 6.44 | $ 6.36 | $ 6.23 | $ 4.97 | $ 7.95 |  |  | $ 6.39 |  |  | $ 5.60 |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Vesting Rate |  |  |  | 20.00% |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  | 50.00% |  |
Number Of Trading Period Days Where Entitys Average Closing Price Per Common Share Is Greater Than The Stated Lower Amount Triggering Vesting |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |
Stated Lower Amount Where Entitys Average Closing Price Per Common Share Is Greater Than The Stated Amount Trigerring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.00 | $ 10.00
Share Based Compensation Arrangement by Share Based Payment Award Options Convertible To Common Shares |  |  |  |  |  |  |  |  |  |  |  | 1.13 |  |  |  |  |  |  |  |  |  |
Options Converted To Common Shares Exercise Price |  |  |  |  |  |  |  |  |  |  |  | $ 4.97 |  |  |  |  |  |  |  |  |  |
Deferred Compensation Equity |  |  |  |  |  |  |  |  | $ 2,422,000 | $ 2,771,000 |  | $ 2,480,000 |  |  |  |  |  |  |  |  |  |
Recognized Compensation Expense Average Period |  |  |  |  |  |  |  |  |  | 5.0 |  | 3.6 |  |  |  |  |  |  |  |  |  |
Recognized Compensation Expense | 1,197,000 | 1,384,000 | 1,824,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock or Unit Option Plan Expense Due to Accelerated Vesting |  |  |  |  |  |  |  |  |  |  |  |  | 629,000 |  |  |  |  |  |  |  |  |
Unrecognized Compensation Costs |  |  |  | 2,559,000 |  |  |  |  |  |  |  |  |  |  | 9,648,000 |  |  |  |  |  |  |
Options exercised in period, intrinsic value | 1,603,000 | 2,100,000 | 1,145,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options, exercisable, intrinsic value | 3,930,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,437,962 |  |  |  |  |  |  |
Common Stock Held in Trust | 427,531 | 427,531 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial Vesting Percentage | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting Percentage | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plan, Cost Recognized | 279,000 | 308,000 | 311,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ 3,030,000 | $ 2,062,000 | $ 3,232,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option 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 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period 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 A240 -Subparagraph c(2) -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 2: 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 price as of the beginning of the year 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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -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 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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