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Goodwill and Other Intangible Assets Schedule of Goodwill (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  | $ 1,085,420 | $ 1,082,540 | $ 1,095,731
Goodwill, Accumulated Impairment Loss |  | (784,053) | (784,053) | (678,342)
Goodwill |  | 301,367 | 298,487 | 417,389
Goodwill, Written off Related to Sale of Business Unit |  |  | (7,536) |
Goodwill, Translation Adjustments |  |  | (5,655) |
Goodwill, Period Increase (Decrease) |  | 2,880 | (13,191) |
Goodwill, Impairment Loss |  | 0 |  |
Industrial [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  | 410,694 | 408,705 | 414,298
Goodwill, Accumulated Impairment Loss |  | 137,204 | 137,204 | 137,204
Goodwill |  | 273,490 | 271,501 | 277,094
Goodwill, Written off Related to Sale of Business Unit |  |  | (1,075) |
Goodwill, Translation Adjustments |  |  | (4,518) |
Goodwill, Period Increase (Decrease) |  | 1,989 | (5,593) |
WIDIA [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  | 41,515 | 40,624 | 41,073
Goodwill, Accumulated Impairment Loss |  | 13,638 | 13,638 | 13,638
Goodwill |  | 27,877 | 26,986 | 27,435
Goodwill, Written off Related to Sale of Business Unit |  |  | 0 |
Goodwill, Translation Adjustments |  |  | (449) |
Goodwill, Period Increase (Decrease) |  | 891 | (449) |
Infrastructure [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Gross |  | 633,211 | 633,211 | 640,360
Goodwill, Accumulated Impairment Loss |  | 633,211 | 633,211 | 527,500
Goodwill |  | 0 | 0 | $ 112,860
Goodwill, Written off Related to Sale of Business Unit |  |  | (6,461) |
Goodwill, Translation Adjustments |  |  | (688) |
Goodwill, Period Increase (Decrease) |  | $ 0 | (7,149) |
Goodwill, Impairment Loss | $ 105,700 |  | $ (105,711) |

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