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Supporting Financial Information - Goodwill and Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Goodwill |  |  |
Gross Balance |  |  | $ 34,745
Measurement period adjustment | $ 9,000 | $ 8,756 |
Adjusted Gross Balance |  | 25,989 |
Intangible Assets |  |  |
Measurement period adjustment | 9,000 |  |
Movement in Accumulated Amortization, Finite-Lived Intangible Assets [Roll Forward] |  |  |
Accumulated amortization |  | (2,496) | (1,058)
Prior period amortization adjustment | $ 300 | 324 |
Current period amortization |  | (1,762) |
Net balance |  | 15,127 |
Goodwill and Intangible Assets, Net |  |  |
Gross Balance |  |  | 43,362
Measurement period adjustment |  | 250 |
Adjusted Net Balance |  | 43,612 |
Net Balance |  | 41,116 | 42,304
Amortization of intangibles, including prior prior amortization adjustment |  | $ (1,400) |
Finite-lived intangibles estimated useful lives |  | 10 years |
Estimated amortization expense for future years |  |  |
Year 1 |  | $ 1,762 |
Year 2 |  | 1,762 |
Year 3 |  | 1,762 |
Year 4 |  | 1,762 |
Year 5 |  | 1,762 |
Thereafter |  | 6,317 |
Net balance |  | 15,127 |
Customer Relationships |  |  |
Intangible Assets |  |  |
Gross Balance |  |  | 7,247
Measurement period adjustment |  | 9,379 |
Adjusted Gross Balance |  | 16,626 |
Movement in Accumulated Amortization, Finite-Lived Intangible Assets [Roll Forward] |  |  |
Accumulated amortization |  | (2,355) | (993)
Prior period amortization adjustment |  | 300 |
Current period amortization |  | (1,662) |
Net balance |  | 14,271 |
Estimated amortization expense for future years |  |  |
Net balance |  | 14,271 |
Non Compete |  |  |
Intangible Assets |  |  |
Gross Balance |  |  | 1,370
Measurement period adjustment |  | (890) |
Adjusted Gross Balance |  | 480 |
Movement in Accumulated Amortization, Finite-Lived Intangible Assets [Roll Forward] |  |  |
Accumulated amortization |  | (68) | (65)
Prior period amortization adjustment |  | 45 |
Current period amortization |  | (48) |
Net balance |  | 412 |
Estimated amortization expense for future years |  |  |
Net balance |  | 412 |
Trade Name |  |  |
Intangible Assets |  |  |
Gross Balance |  |  | 0
Measurement period adjustment |  | 517 |
Adjusted Gross Balance |  | 517 |
Movement in Accumulated Amortization, Finite-Lived Intangible Assets [Roll Forward] |  |  |
Accumulated amortization |  | (73) | $ 0
Prior period amortization adjustment |  | (21) |
Current period amortization |  | (52) |
Net balance |  | 444 |
Estimated amortization expense for future years |  |  |
Net balance |  | $ 444 |

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