Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
Preferred stock, shares par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	12,500,000	12,500,000
Common stock, shares par value	$ 0.06	$ 0.06
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	85,342,000	85,049,000
Common stock, shares outstanding	85,342,000	85,049,000
Treasury stock, shares	3,287,000	3,182,000
Series B [Member]
Liquidation preference, per share	$ 25.00	$ 25.00
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	7,950,000	7,950,000
Preferred stock, shares outstanding	7,950,000	7,950,000