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Note 6. Interest Rate Swap Derivatives (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Note 6. Interest Rate Swap Derivatives (Details) [Line Items]
Derivative, Notional Amount	$ 48,600,000	$ 25,300,000	$ 48,600,000	$ 25,300,000
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net			0
Interest Expense	$ 4,873,000	$ 2,739,000	$ 9,607,000	$ 5,569,000
Interest Rate Swap [Member]
Note 6. Interest Rate Swap Derivatives (Details) [Line Items]
Derivative, Number of Instruments Held	3		3
Derivative, Notional Amount	$ 250,000,000		$ 250,000,000
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer			12 months
Scenario, Forecast [Member]
Note 6. Interest Rate Swap Derivatives (Details) [Line Items]
Interest Expense			$ 623,000

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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The number of derivative instruments of a particular group held by the entity.

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Amount of the cost of borrowed funds accounted for as interest expense.

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