Investments and Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2013

Investments and Fair Value Measurements [Abstract]

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

The amortized cost and fair value of available-for-sale investments at March 31, 2013 and December 31, 2012 were as follows:

			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
	( in thousands)
March 31, 2013
Long-term:
Auction rate student loan educational bonds	$	21,275	$	—	$	1,284	$	19,991

December 31, 2012
Long-term:
Auction rate student loan educational bonds	$	21,300	$	—	$	1,284	$	20,016

Investments Classified by Contractual Maturity Date [Table Text Block]

	Fair Value		Amortized Cost
Due within one year	$	—	$	—
Due after one year through five years	—		—
Due after five years through ten years	—		—
Due after ten years through May 1, 2040	19,991		21,275
	$	19,991	$	21,275

Schedule of Inputs Used in Securities Models [Table Text Block]

	March 31, 2013	December 31, 2012
Average life of underlying loans	2-12 years	2-12 years
Rate of return	0.43-2.31%	0.42-2.11%
Discount rate	0.27-0.94%	0.25-0.84%
Liquidity discount rate	0.25-0.63%	0.17-0.61%

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The table below presents a rollforward for all assets and liabilities, measured at fair value, on a recurring basis using significant unobservable inputs (Level 3) during the three months ended March 31, 2013 and 2012.

	Available-for-sale debt securities
	(in thousands)
	2013			2012
Balance, January 1	$	20,016		$	50,569
Settlements	(25		)	(25		)
Purchases	—			—
Issuances	—			—
Sales	—			—
Transfers in to (out of) Level 3	—			—
Total gains or losses (realized/unrealized):
Included in earnings	—			—
Included in other comprehensive income, net of tax	—			—
Balance, March 31,	$	19,991		$	50,544