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

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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Stockholders' Equity (Details 1) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended
Stockholders' Equity (Details 1) (USD $)	Feb. 12, 2015	Apr. 30, 2015	Mar. 31, 2015	Mar. 31, 2014
Components of basic and diluted earnings per share
Net income			$ 67,113,000	$ 74,864,000
Weighted average shares outstanding - basic and diluted			83,581,000	85,019,000
Earnings per share:
Earnings per share from continuing operations, basic and diluted (in dollars per share)			$ 0.80	$ 0.88
Dividends
Dividends accrued, per share (in dollars per share)	$ 0.43		$ 0.43
Dividends to be paid			$ 35,900,000us-gaap_DividendsPayableCurrent
Common stock repurchases
Shares repurchased in the open market or privately			106,058us-gaap_TreasuryStockSharesAcquired	280,186us-gaap_TreasuryStockSharesAcquired
Shares repurchased from employees to cover minimum income tax withholdings		306,533	5,558	2,667