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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 26,164 | $ 25,998
Accumulated Amortization | 24,160 | 23,558
Intangible assets, net | 2,004 | 2,440
Customer contracts |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 7,818 | 7,786
Accumulated Amortization | 7,668 | 7,786
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 12,082 | 11,863
Accumulated Amortization | 10,302 | 9,557
Non-compete agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 3,013 | 3,052
Accumulated Amortization | 3,013 | 3,048
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2,710 | 2,751
Accumulated Amortization | 2,651 | 2,642
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 541 | 546
Accumulated Amortization | $ 526 | $ 525

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