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Income Taxes, Deferred Tax Valuation Allowance (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred tax valuation allowance, rollfoward
Deferred tax assets, valuation allowance, current	$ 1,100,000
Deferred tax assets valuation allowance noncurrent	40,208,000	29,262,000
Deferred tax asset valuation allowance
Deferred tax valuation allowance, rollfoward
Balance at beginning of period	30,261,000	29,891,000	19,234,000
Charged to Costs and Expenses	3,033,000	(1,450,000)	(832,000)
Charged to Other Accounts	8,001,000	1,820,000	11,489,000
Balance at end of period	$ 41,295,000	$ 30,261,000	$ 29,891,000

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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- Definition

Amount of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

+ References+ Details

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized expected to be realized or consumed after one year (or the normal operating cycle, if longer).

+ References+ Details