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Stockholders' Equity (Details Textual) (USD $)	9 Months Ended						3 Months Ended				9 Months Ended
	Sep. 30, 2012	Dec. 19, 2012	Dec. 31, 2011	Mar. 31, 2011 Performance Based Restricted Stock Units [Member]	Mar. 31, 2010 Performance Based Restricted Stock Units [Member]	Mar. 31, 2009 Performance Based Restricted Stock Units [Member]	Jun. 30, 2011 Restricted Stock Units (RSUs) [Member]	Mar. 31, 2011 Restricted Stock Units (RSUs) [Member]	Mar. 31, 2010 Restricted Stock Units (RSUs) [Member]	Mar. 31, 2009 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2012 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2011 Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU's issued	325,000		267,000	71,000	63,000	95,496
Performance of RSU's Vesting								100% or 40% on April 1, 2014	100% or 40% on April 1, 2013	100% or 40% on April 1, 2012
Performance of Outstanding RSU's										40.00%
Compensation expense Estimate vesting								100.00%	100.00%	100.00%
Modified Estimate vesting of RSU's							40.00%				0.00%	0.00%
Additional RSU's issued	179,000							48,000	42,000
Vest period of additional RSU's issued								4 years	4 years
Stockholders' Equity (Textual) [Abstract]
Dividend declared per share	$ 0.42
Dividends Payable, Amount Per Share		$ 0.14
Aggregate dividend declared	$ 9,500,000
Purchase of Common Stock	310,000,000
Repurchase of Common Stock	9,035,000		8,215,000
Aggregate cost of Repurchase of Common Stock	207,187,000		181,000,000
Cumulative Repurchase of Common Stock	9,000,000
Cumulative aggregate cost of Repurchase of Common Stock	26,200,000
Additional Purchase of Common Stock	$ 50,000,000

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The additional amount authorized by an entity's Board of Directors under a stock repurchase plan.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Equity impact of aggregate cash, stock, and paid-in-kind dividends declared for all securities (common shares, preferred shares, etc.) during the period.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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