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Summary of Significant Accounting Policies - Narrative (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Schedule of Significant Accounting Policies [Line Items]              
Realized gain (loss) on foreign currency transactions         $ (1,400,000) $ 600,000 $ (3,300,000)
Venezuela remeasurement charges     $ 1,500,000     1,500,000  
Number of segments | segment         2    
Impairment charge         $ 0    
Intangible asset impairment charges $ 100,000 $ 100,000   $ 200,000 0 70,000 202,000
Interest and penalties on unrecognized tax benefits         0 0 0
Unrecognized tax benefits 0 0   $ 0 0 0 0
Advertising expense         $ 1,200,000 $ 1,400,000 $ 1,000,000
Minimum              
Schedule of Significant Accounting Policies [Line Items]              
Term on financing receivables         30 days    
Maximum              
Schedule of Significant Accounting Policies [Line Items]              
Term on financing receivables         90 days    
Internal Use Software              
Schedule of Significant Accounting Policies [Line Items]              
Finite-lived Intangible Assets Amortization Expense [Table Text Block]         5.4 9.2 8.6
Finite-lived intangible assets $ 29,700,000 $ 26,000,000     $ 29,700,000 $ 26,000,000  
Internal Use Software | Minimum              
Schedule of Significant Accounting Policies [Line Items]              
Useful life of intangible assets         3 years    
Internal Use Software | Maximum              
Schedule of Significant Accounting Policies [Line Items]              
Useful life of intangible assets         6 years    
Customer lists              
Schedule of Significant Accounting Policies [Line Items]              
Useful life of intangible assets         14 years    
Non-competition agreements              
Schedule of Significant Accounting Policies [Line Items]              
Useful life of intangible assets         4 years    
Trade names              
Schedule of Significant Accounting Policies [Line Items]              
Useful life of intangible assets         13 years    
Patents              
Schedule of Significant Accounting Policies [Line Items]              
Useful life of intangible assets         9 years    
Office equipment and furniture              
Schedule of Significant Accounting Policies [Line Items]              
Useful life of property and equipment         7 years    
Venezuelan bolívar fuerte              
Schedule of Significant Accounting Policies [Line Items]              
Rate on currency remeasurement 6.3       6.3    
Exchange rate 198       198