Condensed Consolidated Balance Sheets Parenthetical - $ / shares	Mar. 31, 2017	Dec. 31, 2016
Condensed Consolidated Balance Sheets Parenthetical [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	110,000,000	110,000,000
Common stock, shares issued	67,224,463	67,150,352
Treasury stock, shares	5,195,791	5,195,791