Stock-Based Compensation Non-employee Directors Equity Plan (Details 11) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares			0	32,000
Allocated Share-based Compensation Expense	$ 18,171	$ 18,193	$ 37,041	$ 34,699
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Allocated Share-based Compensation Expense	$ 1,150	$ 1,425	$ 1,150	$ 1,550
Equity Option [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	0	0	0	0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised			0	27,000
Allocated Share-based Compensation Expense	$ 12,455	$ 12,083	$ 26,353	$ 23,289
Restricted Stock [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	53,000	45,000	53,000	45,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted			8,000	8,000
COMMON STOCK \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			16,000	23,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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