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Business Segments (Information by Operating Segment) (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | $ 737,602 | $ 672,677 | $ 1,429,801 | $ 1,332,113 |
Income (Loss) from Operations | 57,963 | 65,626 | 97,966 | 109,840 |
Equity in earnings of affiliates, net | 1,467 | 931 | 3,146 | 3,510 |
Interest Expense, Net | (6,807) | (15,264) | (12,532) | (21,963) |
Debt Extinguishment Costs | 0 | (11,378) | 0 | (11,378) |
Non-operating pension and postretirement benefit income, net | 12,253 | 23,041 | 32,181 | 44,427 |
Gain (loss) on marketable equity securities, net | 7,791 | (2,554) | 31,857 | (16,656) |
Other income, net | 1,228 | 2,333 | 30,579 | 11,520 |
Income Before Income Taxes | 73,895 | 62,735 | 183,197 | 119,300 |
Depreciation of property, plant and equipment | 13,884 | 13,619 | 27,407 | 28,261 |
Amortization Of Intangible Assets and Impairment of Long-Lived Assets | 13,573 | 11,399 | 26,633 | 21,783 |
Amortization of Intangible Assets | 12,880 | 11,399 | 25,940 | 21,783 |
Impairment of long-lived assets | 693 | 0 | 693 | 0 |
Pension Service Cost | 4,963 | 4,317 | 10,184 | 9,257 |
Identifiable Assets | 3,510,636 |  | 3,510,636 |  | $ 3,120,280
Marketable equity securities | 518,099 |  | 518,099 |  | 496,390
Investments in Affiliates | 159,660 |  | 159,660 |  | 143,813
Prepaid Pension Cost | 1,024,555 |  | 1,024,555 |  | 1,003,558
Total Assets | 5,212,950 |  | 5,212,950 |  | 4,764,041
Operating Segments [Member] | Education [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 367,763 | 370,005 | 740,217 | 745,504 |
Income (Loss) from Operations | 26,305 | 37,554 | 51,900 | 60,254 |
Depreciation of property, plant and equipment | 6,137 | 6,839 | 12,338 | 14,445 |
Amortization Of Intangible Assets and Impairment of Long-Lived Assets | 4,070 | 1,663 | 7,637 | 2,812 |
Amortization of Intangible Assets | 3,377 | 1,663 | 6,944 | 2,812 |
Impairment of long-lived assets | 693 | 0 | 693 | 0 |
Pension Service Cost | 2,522 | 1,878 | 5,186 | 4,542 |
Identifiable Assets | 1,789,059 |  | 1,789,059 |  | 1,568,747
Operating Segments [Member] | Education [Member] | Kaplan Corporate and Other [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 2,369 | 442 | 4,671 | 727 |
Income (Loss) from Operations | (10,990) | (8,763) | (22,394) | (17,658) |
Depreciation of property, plant and equipment | 54 | 158 | 106 | 312 |
Pension Service Cost | 160 | (29) | 330 | 127 |
Identifiable Assets | 61,373 |  | 61,373 |  | 28,731
Operating Segments [Member] | Education [Member] | Reportable Subsegments [Member] | Kaplan International [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 188,580 | 184,303 | 374,336 | 367,885 |
Income (Loss) from Operations | 25,537 | 24,187 | 49,822 | 44,591 |
Depreciation of property, plant and equipment | 3,716 | 3,764 | 7,598 | 7,738 |
Pension Service Cost | 110 | 84 | 227 | 167 |
Identifiable Assets | 1,225,819 |  | 1,225,819 |  | 1,101,040
Operating Segments [Member] | Education [Member] | Reportable Subsegments [Member] | Higher Education [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 76,288 | 85,981 | 159,068 | 185,811 |
Income (Loss) from Operations | 2,721 | 11,219 | 4,636 | 12,574 |
Depreciation of property, plant and equipment | 629 | 1,274 | 1,226 | 3,132 |
Pension Service Cost | 1,102 | 804 | 2,265 | 2,210 |
Identifiable Assets | 186,623 |  | 186,623 |  | 126,752
Operating Segments [Member] | Education [Member] | Reportable Subsegments [Member] | Test Preparation [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 65,673 | 68,604 | 126,823 | 127,755 |
Income (Loss) from Operations | 4,289 | 6,120 | 3,835 | 6,641 |
Depreciation of property, plant and equipment | 779 | 973 | 1,584 | 1,951 |
Pension Service Cost | 821 | 729 | 1,687 | 1,458 |
Identifiable Assets | 158,612 |  | 158,612 |  | 145,308
Operating Segments [Member] | Education [Member] | Reportable Subsegments [Member] | Professional (U.S.) [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 35,147 | 31,057 | 76,361 | 64,413 |
Income (Loss) from Operations | 4,745 | 4,780 | 16,004 | 14,095 |
Depreciation of property, plant and equipment | 959 | 670 | 1,824 | 1,312 |
Pension Service Cost | 329 | 290 | 677 | 580 |
Identifiable Assets | 156,632 |  | 156,632 |  | 166,916
Operating Segments [Member] | Education [Member] | Intersubsegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | (294) | (382) | (1,042) | (1,087) |
Income (Loss) from Operations | 3 | 11 | (3) | 11 |
Operating Segments [Member] | Television Broadcasting [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 116,628 | 114,086 | 224,851 | 222,888 |
Income (Loss) from Operations | 44,494 | 41,118 | 80,034 | 81,660 |
Depreciation of property, plant and equipment | 3,293 | 2,974 | 6,532 | 6,045 |
Amortization Of Intangible Assets and Impairment of Long-Lived Assets | 1,408 | 1,408 | 2,816 | 2,816 |
Pension Service Cost | 780 | 601 | 1,511 | 1,094 |
Identifiable Assets | 475,379 |  | 475,379 |  | 452,853
Operating Segments [Member] | Healthcare [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 40,641 | 38,208 | 78,369 | 75,829 |
Income (Loss) from Operations | 2,598 | 764 | 4,927 | (627) |
Depreciation of property, plant and equipment | 607 | 647 | 1,217 | 1,300 |
Amortization Of Intangible Assets and Impairment of Long-Lived Assets | 1,410 | 1,809 | 2,808 | 3,617 |
Pension Service Cost | 63 | 165 | 246 | 287 |
Identifiable Assets | 123,876 |  | 123,876 |  | 108,596
Operating Segments [Member] | Other Businesses [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 212,614 | 150,399 | 386,448 | 287,937 |
Income (Loss) from Operations | (2,196) | (1,054) | (11,433) | (4,749) |
Depreciation of property, plant and equipment | 3,605 | 2,906 | 6,838 | 5,965 |
Amortization Of Intangible Assets and Impairment of Long-Lived Assets | 6,685 | 6,519 | 13,372 | 12,538 |
Pension Service Cost | 367 | 378 | 841 | 667 |
Identifiable Assets | 962,227 |  | 962,227 |  | 827,113
Corporate Office [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | 0 | 0 | 0 | 0 |
Income (Loss) from Operations | (13,238) | (12,756) | (27,462) | (26,698) |
Depreciation of property, plant and equipment | 242 | 253 | 482 | 506 |
Amortization Of Intangible Assets and Impairment of Long-Lived Assets | 0 | 0 | 0 | 0 |
Pension Service Cost | 1,231 | 1,295 | 2,400 | 2,667 |
Identifiable Assets | 160,095 |  | 160,095 |  | $ 162,971
Intersegment Elimination [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating Revenues | $ (44) | $ (21) | $ (84) | $ (45) |

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