Stock Based Compensation (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]
Unrecognized Equity Compensation	$ 5,400,000
Unrecognized Equity Compensation, Weighted Average Period for Recognition	2 years 1 month 24 days
Restricted shares
Restricted Stock Award, Forfeitures [Abstract]
Restricted Stock, Balance, January 1, 2012 (in shares)	301,373	368,805	4,000
Restricted Stock, Granted, Shares	305,157	130,021	488,040
Restricted Stock, Vested, Shares	(142,727)	(163,680)	(121,935)
Restricted Stock, Expired, Shares	0	0	0
Restricted Stock, Forfeited, Shares	(78,290)	(33,773)	(1,300)
Restricted Stock Outstanding, June 30, 2012 (in shares)	385,513	301,373	368,805
Restricted Stock, Weighted Average Grant Price, Balance, January 1, 2012 (in dollars per share)	$ 17.82	$ 18.24	$ 619.55
Restricted Stock, Granted, Weighted Average Grant Price	$ 20.06	$ 17.18	$ 16.39
Restricted Stock, Vested, Weighted Average Grant Price	$ 19.44	$ 18.50	$ 23.05
Restricted Stock, Expired, Weighted Average Grant Price	$ 0.00	$ 0.00	$ 0.00
Restricted Stock, Forfeited, Weighted Average Exercise Price	$ 17.02	$ 16.63	$ 723.41
Restricted Stock Outstanding, Weighted Average Grant Price, Balance, June 30, 2012 (in dollars per share	$ 19.16	$ 17.82	$ 18.24
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Stock Options, Shares, Oustanding, January 1, 2012 (in shares)	15,800	18,920	28,932
Stock Options, Granted, Shares	0	0	0
Stock Options, Exercised, Shares	0	0	0
Stock Options, Expired, Shares	(1,211)	(2,600)	(9,195)
Stock Options, Cancelled, Shares	(2,190)	(520)	(817)
Stock Options, Shares, Oustanding, June 30, 2012 (in shares)	12,399	15,800	18,920
Stock Options, Weighted Average Grant Price, Balance, January 1, 2012 (in dollars per share)	$ 1,393.65	$ 1,357.97	$ 1,390.07
Stock Options Granted, Weighted Average Grant Price	$ 0.00	$ 0.00	$ 0.00
Stock Options, Exercised, Weighted Average Grant Price	$ 0.00	$ 0.00	$ 0.00
Stock Options, Expired, Weighted Average Grant Price	$ 1,362.40	$ 1,231.98	$ 1,449.05
Stock Options, Cancelled, Weighted Average Exercise Price	$ 1,184.58	$ 903.92	$ 1,469.48
Stock Options, Weighted Average Grant Price, Outstanding, June 30, 2012 (in dollars per share)	$ 1,433.63	$ 1,393.65	$ 1,357.97
Stock Options, Shares Exercisable, June 30, 2012	11,996	14,011	14,655
Stock Options, Weighted Average Exercise Price, June 30, 2012	$ 1,447.69	$ 1,507.87	$ 1,497.94
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]
Stock Options, Outstanding, Weighted Average Life	1 year 3 months 18 days	2 years 1 month 6 days
Stock Options, Outstanding, Intrinsic Value	0	0
Stock Options, Exercisable, Weighted Average Life	1 year 2 months 18 days	2 years 1 month 6 days
Stock Options, Exercisable, Intrinsic Value	0	0
Performance Shares
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]
Shares Available for Grant	5,382,896
Term 1
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]
Long-Term Incentive Plans, Vesting Periods	4 years
Term 2
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]
Long-Term Incentive Plans, Vesting Periods	6 years
Term 3
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]
Long-Term Incentive Plans, Vesting Periods	8 years
Term 4
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]
Long-Term Incentive Plans, Vesting Periods	10 years
Stock Compensation Plan
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]
Stock-based Compensation Expense	3,808,000	3,863,000	3,163,000
Stock Compensation Plan \| Restricted shares
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]
Stock-based Compensation Expense	3,765,000	3,595,000	2,435,000
Stock Compensation Plan \| Stock options
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]
Stock-based Compensation Expense	$ 43,000	$ 268,000	$ 728,000

Share-based Compensation Arrangement by Share-based Payment Award, Other Than Options, Expirations in Period

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Share-based Compensation Arrangements by Share-based Payment Award, Options, Cancelled in Period

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Share-based Compensation Arrangements by Share-based Payment Award, Options, Cancelled in Period, Weighted Average Exercise Price

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Share-based Compensation Arrangements by Share-based Payment Award, Other Than Options, Expirations in Period, Weighted Average Exercise Price

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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.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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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.

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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.

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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).

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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).

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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.

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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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.

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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.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Net number of share options (or share units) granted during the period.

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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.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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Number of share options (or share units) exercised during the current period.

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