Stock Based Compensation (Details) (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 1,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	8 years 5 months
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	0.00%
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]
Unrecognized Equity Compensation	7,400,000
Unrecognized Equity Compensation, Weighted Average Period for Recognition	2 years 6 months 24 days
Restricted shares
Restricted Stock Award, Forfeitures [Abstract]
Restricted Stock, Balance, beginning of period (in shares)	385,513	301,373	368,805
Restricted Stock, Granted, Shares	253,378	305,157	130,021
Restricted Stock, Vested, Shares	(171,339)	(142,727)	(163,680)
Restricted Stock, Forfeited, Shares	(13,473)	(78,290)	(33,773)
Restricted Stock Outstanding, end of period (in shares)	454,079	385,513	301,373
Restricted Stock, Weighted Average Grant Price, Balance, beginning of period (in dollars per share)	$ 19.16	$ 17.82	$ 18.24
Restricted Stock, Granted, Weighted Average Grant Price	$ 22.27	$ 20.06	$ 17.18
Restricted Stock, Vested, Weighted Average Grant Price	$ 18.14	$ 19.44	$ 18.50
Restricted Stock, Forfeited, Weighted Average Exercise Price	$ 19.63	$ 17.02	$ 16.63
Restricted Stock Outstanding, Weighted Average Grant Price, Balance, end of period (in dollars per share	$ 21.27	$ 19.16	$ 17.82
Stock options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Stock Options, Shares, Oustanding, beginning of period (in shares)	12,399	15,800	18,920
Stock Options, Granted, Shares	245,847	0	0
Stock Options, Exercised, Shares	0	0	0
Stock Options, Expired, Shares	(5,524)	(1,211)	(2,600)
Stock Options, Cancelled, Shares	(96)	(2,190)	(520)
Stock Options, Shares, Oustanding, end of period (in shares)	252,626	12,399	15,800
Stock Options, Weighted Average Grant Price, Balance, beginning of period (in dollars per share)	$ 1,433.63	$ 1,393.65	$ 1,357.97
Stock Options Granted, Weighted Average Grant Price	$ 21.69	$ 0.00	$ 0.00
Stock Options, Exercised, Weighted Average Grant Price	$ 0.00	$ 0.00	$ 0.00
Stock Options, Expired, Weighted Average Grant Price	$ 1,833.61	$ 1,362.40	$ 1,231.98
Stock Options, Cancelled, Weighted Average Exercise Price	$ 1,337.16	$ 1,184.58	$ 903.92
Stock Options, Weighted Average Grant Price, Outstanding, end of period (in dollars per share)	$ 50.87	$ 1,433.63	$ 1,393.65
Stock Options, Shares Exercisable, end of period	77,301	11,996	14,011
Stock Options, Weighted Average Exercise Price, end of period	$ 116.85	$ 1,447.69	$ 1,507.87
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]
Stock Options, Outstanding, Weighted Average Life	9 years	1 year 3 months 18 days
Stock Options, Outstanding, Intrinsic Value	3,046,000	0
Stock Options, Exercisable, Weighted Average Life	8 years 5 months	1 year 2 months 18 days
Stock Options, Exercisable, Intrinsic Value	889,000	0
Performance Shares
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]
Shares Available for Grant	4,936,148
Term 1
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]
Long-Term Incentive Plans, Vesting Periods	6 years
Term 2
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	4,947,000	3,808,000	3,863,000
Stock Compensation Plan \| Restricted shares
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]
Stock-based Compensation Expense	4,255,000	3,765,000	3,595,000
Stock Compensation Plan \| Stock options
Weighted Average Contractual Life And Aggregate Intrinsic Value Of Stock Options [Abstract]
Stock-based Compensation Expense	$ 692,000	$ 43,000	$ 268,000

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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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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Unrecognized cost of unvested share-based compensation awards.

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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 estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-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.

+ References

No definition available.

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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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No definition available.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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Value, before forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Topic 505

-SubTopic 10

-Section S99

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Name Regulation S-X (SX)

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