Description of Business and Summary of Significant Accounting Policies (Advertising and Sales Commission) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Capitalized Direct Response Advertising Costs [Line Items]
Advertising Expense	$ 6,200	$ 4,000	$ 1,700
Capital Direct Response Advertising, Amortization	4,100	2,400
Deferred Sales Commission	612	564
Amortization of Deferred Sales Commissions	1,300	840
Capitalized Direct Response Advertising Costs, net	$ 2,800	$ 2,900
Minimum [Member]
Capitalized Direct Response Advertising Costs [Line Items]
Capitalized Direct Response Advertising Costs, Amortization Period	12 months
Maximum [Member]
Capitalized Direct Response Advertising Costs [Line Items]
Capitalized Direct Response Advertising Costs, Amortization Period	24 months