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Income Taxes (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Uncertain tax positions
Accrued interest	$ 5,328
Penalties	678
Reconciliation of the total amounts of unrecognized tax benefits
Gross adjustments - Central Merger	6,780
Lapse of statute of limitations	(6,780)
Unrecognized tax benefits at the end of the period	$ 0

This element represents the amount of statutory penalties accrued as of the date of the statement of financial position for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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- Definition

This element represents the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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