Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2017	Dec. 31, 2016
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	85,565,000	85,316,000
Common stock, shares outstanding	85,565,000	85,316,000
Treasury stock, shares	3,382,000	3,264,000
Series B [Member]
Preferred stock, shares authorized	10,000,000	10,000,000
Liquidation preference, per share	$ 25.00	$ 25.00
Preferred stock, shares issued	7,950,000	7,950,000
Preferred stock, shares outstanding	7,950,000	7,950,000