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Derivatives and Hedging Activities Accumulated Other Comprehensive Income Related to Derivatives (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivative [Line Items]
Accumulated other comprehensive income on cash flow hedges, balance at beginning of year	$ (2,969)	$ (3,106)
Net change in unrealized gain/ (loss) on cash flow hedges	207	81
Accumulated other comprehensive income on cash flow hedges, balance at end of period	$ (2,762)	$ (3,025)

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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