Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Thousands	Jun. 30, 2017	Dec. 31, 2016
Consolidated Balance Sheets
Preferred stock-par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock-shares authorized	5,000	5,000
Preferred stock-shares issued	0	0
Class A Common stock-par value (in dollars per share)	$ 0.01	$ 0.01
Class A Common stock-shares authorized	250,000	250,000
Class A Common stock-shares issued	99,701	99,701
Class A Common stock-shares outstanding	83,598	83,118
Common shares in treasury	16,103	16,583