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Benefit Plans (Details) (USD $) | 12 Months Ended |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Non-vested Shares [Member] | Dec. 31, 2012 Non-vested Shares [Member] | Dec. 31, 2011 Non-vested Shares [Member] | Dec. 31, 2010 Employee Stock Option [Member] | Dec. 31, 2013 Employee Stock Option [Member] | Dec. 31, 2012 Employee Stock Option [Member] | Dec. 31, 2011 Employee Stock Option [Member] | Dec. 31, 2010 Options 2010 [Member] | Dec. 31, 2013 Options 2010 [Member] | Dec. 31, 2013 Options 2009 [Member] | Jan. 08, 2010 Options 2009 [Member] | Dec. 31, 2013 Options 2008 [Member] | Dec. 31, 2008 Options 2008 [Member] | Dec. 31, 2009 Options 2008 [Member] | Dec. 31, 2008 Options 2008 [Member] Share Based Compensation Arrangement By Share Based Payment Award Vesting Rate First Vesting Trigger [Member] | Dec. 31, 2008 Options 2008 [Member] Minimum [Member] | Dec. 31, 2008 Options 2008 [Member] Maximum [Member] | Dec. 31, 2013 Shares Subject to Time [Member] | Dec. 31, 2013 Shares Subject to Performance [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $ 4,288,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  |  |  | 2,521,046 | 1,465,446 | 1,179,585 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,445,906 | 75,140
Common Share Options Granted (shares) | 0 | 0 | 0 |  |  |  |  |  |  |  | 1,248,501 |  |  | 1,265,500 |  | 2,000,000 |  |  |  |  |  |
Common Share Options Exercise Price (usd per share) |  |  |  |  |  |  | $ 6.23 | $ 6.95 | $ 6.44 | $ 6.36 | $ 7.95 |  |  | $ 6.39 |  | $ 5.6 |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Vesting Rate |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  | 20.00% |  |  |  | 50.00% |  |  |  |
Number Of Trading Period Days Where Entity's Average Closing Price Per Common Share Is Greater Than The Stated Lower Amount Triggering Vesting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 days |  |  |  |  |  |
Stated Lower Amount Where Entity's Average Closing Price Per Common Share Is Greater Than The Stated Amount Triggering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 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 |  |  |  |  |  |  |
Vesting Period | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized Compensation Expense Average Period |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  | 3 years 7 months 6 days |  |  |  |  |  |  |
Recognized Compensation Expense | 1,037,000 | 1,197,000 | 1,384,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized Compensation Costs |  |  |  | 22,426,000 |  |  |  | 1,518,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  | 3,486,552 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |  |  |  | 4 years 4 months 24 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Held in Trust |  | 427,531 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial Vesting Percentage | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting Percentage | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Defined Contribution Plan, Cost Recognized | 298,000 | 279,000 | 308,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense | 7,145,000 | 3,030,000 | 2,062,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 8,607,000 | $ 1,603,000 | $ 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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=27013229&loc=d3e301413-122809 Reference 3: 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 4: 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 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 Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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 Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 Weighted average price 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 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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