Capital Stock (Stock Appreciation Rights) (Details) (Stock Appreciation Rights (SARs) [Member], USD $) In Thousands, except Share data, unless otherwise specified							12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Feb. 15, 2011 years	Mar. 31, 2012 Grant Date July 14, 2008 [Member] years	Jul. 14, 2008 Grant Date July 14, 2008 [Member]	Mar. 31, 2012 Grant Dates February 5, 2009 and April 6, 2009 [Member]	Mar. 31, 2012 Grant Date February 5, 2009 [Member] years	Mar. 31, 2012 Grant Date April 6, 2009 [Member] years	Mar. 31, 2012 Grant Date August 14, 2008 [Member]	Mar. 31, 2012 Grant Date March 17, 2010 [Member] years	Mar. 31, 2012 Grant Date February 15, 2011 [Member] years	Feb. 15, 2011 Grant Date February 15, 2011 [Member]	Mar. 31, 2012 Grant Date January 19, 2012 [Member] years	Mar. 31, 2012 Grant Date February 9, 2012 [Member] years
SARs Outstanding				750,000			150,000	75,000		500,000	1,000,000		2,400,000	350,000
Vested and Exercisable				750,000			150,000	75,000		500,000	1,000,000		0	0
Exercise Price (in dollars per share)				$ 9.56			$ 5.45	$ 5.17		$ 5.95	$ 6.13		$ 9.48	$ 11.01
Original Vesting Period (in years)				3			3	4		4	3		3	3
Fair Value (in dollars per share)				$ 5.15			$ 8.64	$ 8.92		$ 8.36	$ 8.46		$ 6.61	$ 5.90
Liability (in thousands)	$ 32,400	$ 6,100		$ 3,866		$ 12,800	$ 8,457	$ 6,313		$ 4,178	$ 8,459		$ 1,044	$ 96
SARs exercised							700,000	625,000	250,000
Incremental vesting of SARs					250,000							333,333
Period over which SARs vest			3