Share-Based Payments (Details Textual) - shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Employee stock purchase plan maximum shares	6,200,000
1995 ESPP
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares issued under ESPP	98,000	150,000
2015 ESPP
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Shares issued under ESPP	43,000