Description of Business and Summary of Significant Accounting Policies (Accounts Receivables and Allowances) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Net, Current	$ 47,171	$ 41,100
Allowance for doubtful accounts	3,388	1,619
Deferred revenue included in accounts receivables	6,900	5,800
Bad debt expense	3,111	1,600	$ 1,147
Billed Revenues
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Net, Current	36,700	32,600
Unbilled Revenues
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, Net, Current	$ 10,500	$ 8,500