Business Segments (Restructuring Costs) (Details 1) - Education [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Accelerated depreciation	$ 1,815	$ 17,956	$ 2,062
Lease obligation losses	2,694	8,240	1,750
Severance and Special Incentive Program Expense	5,902	17,968	5,075
Software asset write-offs	0	0	7,689
Other	1,441	209	230
Total restructuring costs	$ 11,852	$ 44,373	$ 16,806