Stock-Based Compensation Stock Options (Tables)

3 Months Ended

Jun. 30, 2017

Share-based Compensation Arrangement by Share-based Payment Award

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

	Three Months Ended June 30,
	2017		2016
Stock options	$	2,225	$	2,242
Restricted stock and restricted stock units	16,579		14,573
Employee stock purchase plan	297		301
Affiliate management equity plans	776		19,499
Performance share units	1,185		850
Employee stock trust	6		6
Total stock-based compensation expense	$	21,068	$	37,471

Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block]

	Three Months Ended June 30,
	2017				2016
	Number of Shares		Weighted-Average Exercise Price Per Share		Number of Shares		Weighted-Average Exercise Price Per Share
Options outstanding at March 31	4,593		38.15		4,506		$	38.48
Granted	421		37.64		753		31.31
Exercised	(256	)	28.99		(56	)	29.04
Canceled/forfeited	(44	)	43.73		(42	)	43.93
Options outstanding at June 30	4,714		$	38.55	5,161		$	37.49

Management [Member]

Share-based Compensation Arrangement by Share-based Payment Award

Assumptions used to determine the weighted-average fair value of option grants

	Three Months Ended June 30,
	2017		2016
Expected dividend yield	1.70	%	1.45	%
Risk-free interest rate	1.89	%	1.25	%
Expected volatility	26.79	%	30.95	%
Expected life (in years)	5.09		5.02

Key Employees [Member]

Share-based Compensation Arrangement by Share-based Payment Award

Assumptions used to determine the weighted-average fair value of option grants

	2017		2016
Expected dividend yield	2.96	%	2.87	%
Risk-free interest rate	1.47	%	0.89	%
Expected volatility	27.73	%	26.01	%