Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares			3 Months Ended		6 Months Ended
	May 08, 2018	Jun. 01, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]
Common shares repurchased (in shares)					344,533	46,500
Repurchase of common shares, weighted average price (in dollars per share)					$ 59.20	$ 59.54
Stock divided declared			15.00%		15.00%
Dividend declared per common share (in dollars per share)	$ 0.27	$ 0.23	$ 0.27	$ 0.23	$ 0.54	$ 0.47