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Business Segments (Restructuring Costs) (Details 1) - Education [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]    
Accelerated depreciation $ 339 $ 1,815
Lease obligation losses 0 2,694
Severance 6,099 5,902
Other 2,627 1,441
Total restructuring costs $ 9,065 $ 11,852