For each income statement presented, the amount charged to expense for amortization of capitalized computer software costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Significant Accounting Policies - Property and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Amortization of Capitalized Software	$ 3,300,000	$ 2,200,000	$ 1,400,000
Impairment of Long-Lived Assets	$ 0	$ 600,000	$ 0
Property and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Property and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	7 years
Software \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	1 year
Software \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	3 years