Description of Business and Summary of Significant Accounting Policies Advertising Costs (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Advertising Costs [Abstract]
Advertising Expense	$ 3,100	$ 3,400
Capitalized Direct Response Advertising Costs [Line Items]
Capitalized Direct Response Advertising Costs, net	$ 2,300		$ 2,800
Document Period End Date	Jun. 30, 2017
Capital Direct Response Advertising, Amortization	$ 2,000	$ 2,000
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