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Reserve for Severance Activity in reserve (Details) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Employee Severance [Member]	Jun. 30, 2012 Employee Severance [Member]
Reserve for severance and related payments
Balance at beginning of period	$ 2,739	$ 4,417	$ 4,417	$ 1,282
Charged to earnings			2	6,770
Cash paid			1,680	1,672
Balance at end of the period	$ 2,739	$ 4,417	$ 2,739	$ 6,380

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

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