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Business Segments (Narrative) (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2015
school
Mar. 31, 2018
Segment
Dec. 31, 2017
USD ($)
TelevisionStation
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2014
school
Dec. 31, 2017
USD ($)
TelevisionStation
Segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 03, 2015
campus
Segment Reporting Information [Line Items]                                  
Number of reportable segments | Segment                           6      
Operating Revenues     $ 675,817 $ 657,225 $ 676,087 $ 582,717 $ 629,579 $ 621,638 $ 628,933 $ 601,740       $ 2,591,846 $ 2,481,890 $ 2,586,114  
Television Broadcasting [Member]                                  
Segment Reporting Information [Line Items]                                  
Number of television broadcast stations owned | TelevisionStation     7                     7      
Education [Member]                                  
Segment Reporting Information [Line Items]                                  
Restructuring costs                           $ 9,065 11,852 40,639  
Accrued restructuring costs     $ 8,500       11,800             8,500 11,800    
Non U.S. [Member]                                  
Segment Reporting Information [Line Items]                                  
Operating Revenues                           637,000 624,000 660,000  
Foreign assets     $ 89,000       $ 67,000             89,000 67,000    
UNITED KINGDOM | Education [Member]                                  
Segment Reporting Information [Line Items]                                  
Operating Revenues                           320,000 312,000 319,000  
Higher Education [Member] | Education [Member]                                  
Segment Reporting Information [Line Items]                                  
Restructuring costs                           1,400 7,100 12,400  
Other long-lived assets impairment charge                       $ 6,900          
Higher Education [Member] | Education [Member] | KHE Campuses [Member]                                  
Segment Reporting Information [Line Items]                                  
Number of nationally accredited ground campuses sold | campus                                 38
Test Preparation [Member] | Education [Member]                                  
Segment Reporting Information [Line Items]                                  
Restructuring costs                           4,300      
Kaplan International [Member] | Education [Member]                                  
Segment Reporting Information [Line Items]                                  
Restructuring costs                           $ 2,900 $ 4,700 1,300  
Kaplan International [Member] | Education [Member] | Kaplan China [Member]                                  
Segment Reporting Information [Line Items]                                  
Number of schools sold | school 1                       3        
Kaplan Corporate and Other [Member] | Education [Member]                                  
Segment Reporting Information [Line Items]                                  
Restructuring costs                               $ 25,700  
Periods from 2011 to Q2 2015 [Member] | Test Preparation [Member] | Education [Member]                                  
Segment Reporting Information [Line Items]                                  
Immaterial Error Correction Amount                     $ 3,000            
Subsequent Event [Member]                                  
Segment Reporting Information [Line Items]                                  
Number of reportable segments | Segment   6