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Other Intangible Assets, Net - Components of Other Intangible Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 11,791 $ 9,680
Accumulated Amortization (6,044) (5,329)
Net Book Value 5,747 4,351
Customer and Contractual Relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 2,040 2,135
Accumulated Amortization (1,764) (1,764)
Net Book Value 276 371
Internal-use software    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 9,751 7,545
Accumulated Amortization (4,280) (3,565)
Net Book Value $ 5,471 $ 3,980