Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	41,310,519	41,147,707
Common stock, shares outstanding	34,731,754	34,568,942
Treasury stock, shares	6,578,765	6,578,765