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Other Intangible Assets, Net - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]          
Increase in finite-lived intangible assets $ 5,747   $ 5,747   $ 4,351
Amortization of other intangible assets 400 $ 300 $ 800 $ 600  
Intangible asset, weighted average amortization period     3 years 9 months 15 days    
Customer and Contractual Relationships          
Acquired Finite-Lived Intangible Assets [Line Items]          
Increase in finite-lived intangible assets 276   $ 276   371
Internal-use software          
Acquired Finite-Lived Intangible Assets [Line Items]          
Increase in finite-lived intangible assets $ 5,471   $ 5,471   $ 3,980