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Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 27, 2015
Noncontrolling Interest [Line Items] |  |  |  |
Members’ interest subject to mandatory redemption | $ 40,000 | $ 40,000 |  |
Death and permanent total disability insurance policies | 20,000 |  |  |
Reclassification and revaluation of noncontrolling interest | 0 | 0 | $ (7,367) |
Noncontrolling interests | $ 4,856 | 656 |  |
Myers |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Reclassification and revaluation of noncontrolling interest |  |  | 18,800 |
Noncontrolling interests |  |  |  | $ 7,400
Myers |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Ownership percentage | 50.00% |  |  |
Earnings from consolidated 50% owned subsidiaries | $ 11,500 | $ 8,900 | 4,200 |
Undistributed earnings |  |  | $ 500 |

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