Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Condensed Consolidated Balance Sheets
Common stock, shares authorized	150,000,000	150,000,000
Common stock, stated value (in dollars per share)	$ 0.75	$ 0.75
Common stock, shares outstanding	42,900,000	43,500,000