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Stock Units Awarded Under the 2009 LTIP Plan as of the balance sheet date.

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Amount of excess tax benefit (tax deficiency) that arises when compensation cost from non-qualified share-based compensation recognized on the entity's tax return exceeds (is less than) compensation cost from equity-based compensation recognized in financial statements. Excess tax benefit (tax deficiency) increases (decreases) net cash provided by financing activities.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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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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Stock Based Compensation Stock Based Compensation (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value		$ 2,600,000	$ 1,100,000	$ 100,000
Value of Stock Units Awarded Under the 2009 LTIP Plan		96,000	75,000	94,000
Allocated Share-based Compensation Expense		1,700,000	1,900,000	2,800,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized		3,400,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition		2 years 1 month 6 days
Excess Tax Benefit (Tax Deficiency) from Share-based Compensation, Financing Activities	233,000	0	233,000	(13,000)
Total Numbner of Units Outstanding Under the 2006 Director Equity Plan		16,110
Value of Units Outstanding Under the 2006 Director Equity Plan		500,000
Stock Units Awarded Under the 2009 LTIP Plan		7,000	6,000	6,000
Closing Price of common shares on grant date		$ 13.69
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost		150,000	137,000	188,000
Stock or Unit Option Plan Expense		(600,000)	(300,000)	(100,000)
Total Stock Units Outstanding Under All Stock Option Plans		86,313
Total Value of Units Outstanding Under All Stock Option Plans		1,700,000
Deferred Compensation Equity		2,300,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits		900,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price		$ 24.17	$ 23.76
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price		$ 12.23
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price		$ 12.58
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price		$ 23.24
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price		$ 24.33
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price		$ 29.27
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		1,784,209	1,976,224
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		310,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		(378,674)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period		(123,841)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number		1,761,563
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number		1,236,789
Weighted Average Remaining Contractual Term [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		5 years 7 months 2 days	5 years 11 months 26 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term		5 years 6 months 21 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		4 years 5 months 4 days
Aggregate Intrinsic Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		14,495	493
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value		14,169
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value		$ 5,450