Description of Business and Summary of Significant Accounting Policies (Accounts Receivables and Allowances) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Document Period End Date			Jun. 30, 2016
Accounts receivable	$ 52,816		$ 52,816		$ 47,171
Allowance for doubtful accounts	1,811		1,811		$ 3,388
Deferred revenue included in accounts receivables	4,500		4,500
Provision for doubtful accounts	698	$ 292	457	$ 301
Allowance for Doubtful Accounts Receivable, Write-offs			2,000
Billed Revenues [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	42,900		42,900
Unbilled Revenues [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 9,900		$ 9,900
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delivery term for contractual elements of revenue arrangements			18 months