Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Statement of Financial Position [Abstract]
Common stock, par value per share	$ 0.1	$ 0.1	$ 0.1
Common stock, shares authorized	80,000,000	80,000,000	80,000,000
Common Stock, Value, Issued	$ 3,024	$ 3,024	$ 3,024
Treasury shares, at cost	6,241,981	5,362,684	3,678,936