Business Segments (Restructuring Costs) (Details 1) (Education [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Education [Member]
Restructuring Cost [Line Items]
Accelerated depreciation	$ 17,230	$ 3,965	$ 1,152
Severance	14,349	17,205	15,099
Lease obligation losses	9,794	7,570	5,385
Accelerated amortization of intangible assets	2,595	0	0
Other	1,274	205	5,904
Total restructuring costs	$ 45,242	$ 28,945	$ 27,540