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Intangible Assets, net (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | $ 171,564 | $ 175,403
Accumulated Amortization | (119,194) | (106,531)
Customer related (10-25 year life) |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 107,008 | 107,008
Accumulated Amortization | $ (69,678) | (64,887)
Customer related (10-25 year life) | Minimum |  |
Finite-Lived Intangible Assets |  |
Useful life | 10 years |
Customer related (10-25 year life) | Maximum |  |
Finite-Lived Intangible Assets |  |
Useful life | 25 years |
Contract based (5-7 year life) |  |
Finite-Lived Intangible Assets |  |
Gross Carrying Amount | $ 64,556 | 68,395
Accumulated Amortization | $ (49,516) | $ (41,644)
Contract based (5-7 year life) | Minimum |  |
Finite-Lived Intangible Assets |  |
Useful life | 5 years |
Contract based (5-7 year life) | Maximum |  |
Finite-Lived Intangible Assets |  |
Useful life | 7 years |

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