Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Share-based Payment Arrangement, Option, Activity [Table Text Block]

The following table presents stock options outstanding under these plans (in thousands, except for per share data):

	Number	Weighted- Average Exercise Price		Aggregate Intrinsic Value
Options outstanding at:
December 31, 2017	117,551	$	53.26	$	4,592
December 31, 2018	63,058	54.89		1,163
December 31, 2019	36,100	56.75		1,106
Options vested at:
December 31, 2017	51,286	$	48.62	$	2,241
December 31, 2018	33,573	53.09		679
December 31, 2019	27,193	57.08		824

Schedule of Nonvested Share Activity [Table Text Block]

The following represents a summary of the non-vested shares for the three years ended December 31, 2019 (in thousands):

	Restricted Stock				Restricted Stock Units
	Shares		Weighted Average Grant Date Fair Value		Units		Weighted Average Grant Date Fair Value
Non-vested at January 1, 2017	786,706				—
Granted	177,807		$	86.95	—	—	—
Vested	(194,419	)	63.07		—		—
Forfeited	(102,991	)	78.70		—		—
Non-vested at December 31, 2017	667,103				—
Granted	150,419		$	85.58	—		—
Vested	(242,215	)	74.85		—		—
Forfeited	(47,700	)	75.68		—		—
Non-vested at December 31, 2018	527,607				—
Granted	145,724		$	76.74	46,689		$	87.40
Vested	(114,201	)	61.28		—		—
Forfeited	(131,952	)	83.69		—		—
Non-vested at December 31, 2019	427,178				46,689