Description of Business and Summary of Significant Accounting Policies Advertising Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Advertising Costs [Abstract]
Advertising Expense	$ 1,500	$ 1,700
Capitalized Direct Response Advertising Costs [Line Items]
Capitalized Direct Response Advertising Costs, net	$ 2,600		$ 2,800
Document Period End Date	Mar. 31, 2017
Capital Direct Response Advertising, Amortization	$ 1,000	$ 1,000
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