Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010
Income tax receivables	$ 4,800,000	$ 41,200,000
Percentage bonus depreciation on certain capital expenditures	50.00%	100.00%
Federal tax loss carryforward	114,400,000
Federal tax loss carryforward expiration date, years	20
Deferred tax assets tax losses total	57,600,000
Deferred tax assets, tax credit carryforwards	6,900,000
Deferred tax assets capital loss carryforwards	700,000
Combined future tax benefits	65,200,000
Increased valuation allowance	17,500,000
Cumulative undistributed earnings	29,300,000
More-likely-than-not criteria	If the position meets the more-likely-than-not criteria, it is measured using a probability-weighted approach as the largest amount of tax benefit that is greater than 50% likely of being realized upon settlement.
Taxes and interest	1,800,000
Remaining liability on taxes and interest	800,000
Valuation allowance against future deferred tax assets	3,300,000
Gross unrecognized tax benefits	17,400,000	15,900,000
Accrued interest and penalties	6,700,000	6,100,000
Charge due to the matter discussed	8,700,000	8,000,000
Refundable taxes	1,800,000
Interest and penalties	800,000	600,000
Maximum [Member]
Unrecognized tax benefits decrease	7,400,000
Minimum [Member]
Unrecognized tax benefits decrease	$ 5,400,000