Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Retained Earnings
Balance (in shares) at May. 31, 2012		23,988
Balance at May. 31, 2012	$ 248,131	$ 36,179	$ 211,952
Issuance of shares under equity plan, net of shares withheld for employee taxes		8
Excess tax benefit for share-based compensation	251	$ 251
Non-cash stock compensation expense	1,330	$ 1,330
Dividends declared	(43,881)		(43,881)
Minimum tax withholdings on share-based compensation	(36)
Net income	22,754		22,754
Balance (in shares) at May. 31, 2013		23,996
Balance at May. 31, 2013	228,549	$ 37,724	190,825
Issuance of shares under equity plan, net of shares withheld for employee taxes		12
Excess tax benefit for share-based compensation	183	$ 183
Non-cash stock compensation expense	1,356	1,356
Dividends declared	(19,527)		(19,527)
Minimum tax withholdings on share-based compensation	(11)	$ (11)
Net income	20,408		20,408
Balance (in shares) at May. 31, 2014		24,008
Balance at May. 31, 2014	230,958	$ 39,252	191,706
Issuance of shares under equity plan, net of shares withheld for employee taxes		100
Excess tax benefit for share-based compensation	358	$ 358
Non-cash stock compensation expense	1,292	1,292
Dividends declared	(19,600)		(19,600)
Minimum tax withholdings on share-based compensation	(462)	$ (462)
Net income	15,432		15,432
Balance (in shares) at May. 31, 2015		24,108
Balance at May. 31, 2015	$ 227,978	$ 40,440	$ 187,538