Consolidated Statement of Shareholders' Equity Parenthetical - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Dividends paid per share to common shareholders (in dollars per share)	$ 0.48	$ 0.44	$ 0.4
Shares of common stock issued (in shares)	142,817	140,284	165,934
Shares of incentive common stock issued (in shares)	40,475	0	599,673
Shares of incentive common stock canceled or forfeited (in shares)	(154,905)	(99,927)	(343,929)
Shares of incentive common stock withheld for employee taxes (in shares)	(161,967)	(91,100)	(63,235)
Repurchase of common stock, number of shares (in shares)	(1,642,635)	0	(785,542)