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Other Intangible, Net and Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Change In Gross Amount of Identifiable Intangible Assets |  |  | $ 0 |  |
Finite-Lived Intangible Assets, Amortization Expense | $ 600 | $ 800 | 1,900 | $ 1,800 |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Carrying amount of goodwill | 132,410 |  | 132,410 |  | $ 132,410
Goodwill, Period Increase (Decrease) |  |  | 0 |  |
Gross Amount | 25,900 |  | 25,900 |  |
Accumulated Amortization | 10,804 |  | 10,804 |  |
Net Intangible Assets | 15,096 |  | $ 15,096 |  |
Customer Relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization period (years) |  |  | 20 years |  |
Gross Amount | 13,600 |  | $ 13,600 |  |
Accumulated Amortization | 2,158 |  | 2,158 |  |
Net Intangible Assets | 11,442 |  | 11,442 |  |
Tradename |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Amount | 8,100 |  | 8,100 |  |
Accumulated Amortization | 6,712 |  | 6,712 |  |
Net Intangible Assets | 1,388 |  | 1,388 |  |
Covenants Not to Compete |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Amount | 4,200 |  | 4,200 |  |
Accumulated Amortization | 1,934 |  | 1,934 |  |
Net Intangible Assets | $ 2,266 |  | $ 2,266 |  |
Maximum [Member] | Tradename |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization period (years) |  |  | 6 years |  |
Maximum [Member] | Covenants Not to Compete |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization period (years) |  |  | 10 years |  |
Minimum [Member] | Tradename |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization period (years) |  |  | 6 months |  |
Minimum [Member] | Covenants Not to Compete |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization period (years) |  |  | 1 year |  |

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