Treasury Stock (Details Textual) - USD ($) shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jul. 22, 2008
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased			2,000
Treasury stock acquired	$ 1,098
Repurchase One [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired	$ 4,737
Treasury Stock Shares Acquired Cost Method	1,586
Repurchase Two [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury stock acquired	$ 1,098	$ 13
Treasury Stock Shares Acquired Cost Method	248	3