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Stock Compensation Plans Stock Performance Rights (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares subject to special vesting rights	100,000
Special vesting rights, minimum share price (per share)	$ 11.92
Stock Performance Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Eligibility minimum age requirement	65 years
Weighted average estimated value of SPRs outstanding (per share)	$ 4.01
Valuation assumptions:
Expected volatility, minimum, percent	49.40%
Expected volatility, maximum, percent	71.10%
Risk-free rate of return, minimum	10.00%
Risk-free rate of return, maximum	90.00%
Expected annual dividend	$ 0
Allocated Share-based Compensation Expense	600,000	1,100,000	(800,000)
Activity related to SPRs:
Outstanding at beginning of period	276,200
Granted	340,000
Cancelled	99,500
Outstanding at end of period	516,700	276,200
Exercisable at end of period	175,833
Weighted average exercise price, outstanding, beginning of period	$ 27.58
Weighted average exercise price, granted	$ 7.62
Weighted average exercise price, cancelled	$ 23.28
Weighted average exercise price, outstanding, end of period	$ 15.28	$ 27.58
Weighted average exercise price, exercisable	$ 30.08
SPRs outstanding, intrinsic value	800,000
Total unrecognized compensation cost	$ 1,700,000
Unrecognized cost, period for recognition	3 years 1 month 6 days
SPRs vested in period	85,866
Weighted average remaining contractual term, SPRs outstanding	6 years 6 months
Weighted average remaining contractual term, SPRs exercisable	4 years 1 month 6 days
Stock Performance Rights | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Life of award	7 years
Award vesting period	3 years
Valuation assumptions:
Expected term	3 months 18 days
Stock Performance Rights | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Life of award	10 years
Valuation assumptions:
Expected term	5 years 8 months 12 days

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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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends.

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The estimated measure of the maximum 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 maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Number of shares under non-option equity instrument agreements that were either cancelled or expired.

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