Quarterly Financial Information (Unaudited) - Narrative (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Sep. 30, 2014 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Business Acquisition [Line Items] | |||||||||||
| Restructuring Expenses | $ 3,400 | $ 800 | $ 13,500 | $ 300 | $ 15,500 | $ 4,700 | $ 17,994 | $ 20,218 | $ 0 | ||
| Non-cash provisional income tax benefit | 137,000 | ||||||||||
| Remeasurement of net deferred tax liabilities | 140,000 | ||||||||||
| Estimated expense from loss of manufacturing deduction and other | $ 3,000 | ||||||||||
| Retirement benefits expense | $ 3,700 | ||||||||||
| Building | Other Segments | Operating Segments | |||||||||||
| Business Acquisition [Line Items] | |||||||||||
| Gain on sale of corporate office building | 11,100 | ||||||||||
| Disposal Group, Disposed of by Sale, Not Discontinued Operations | HomeSmart | |||||||||||
| Business Acquisition [Line Items] | |||||||||||
| Charge related to write down of disposal group | $ 4,600 | ||||||||||
| Impairment of long-lived assets to be disposed of | $ 1,000 | $ 1,100 | |||||||||