Investments and Fair Value Measurements (Details) - Corporate Securities [Member] - Investments (Current) [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held-to-maturity Securities, Amortized Cost	$ 12,425
Minimum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held to -maturity Securities, Remaining Maturity	15 days
Maximum [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Held to -maturity Securities, Remaining Maturity	202 days