Condensed Consolidated Statements of Shareholders' Equity (unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Condensed Consolidated Statements of Shareholders' Equity (unaudited) [Abstract]
Cash dividends declared (in dollars per share)	$ 0.18	$ 0.15	$ 0.36	$ 0.30
Repurchase of shares of common stock (in shares)	1,063,901		1,179,688
Issuance of shares of common stock (in shares)		101,408	68,399	105,208
Share based compensation, common stock (in shares)	2,498	7,444	86,626	81,919
Share based compensation withholding obligation, common stock (in shares)		50,057	56,286	87,325