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Earnings per Share (Reconciliation of Denominator for Basic and Diluted Earnings Per Share) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Weighted average common shares—basic	132,714,566	133,072,254
Plus incremental shares from: Assumed exercise of options	490,740	540,670
Weighted average common shares-diluted	133,205,306	133,612,924
Earnings per share: Basic	$ 1.10us-gaap_EarningsPerShareBasic	$ 1.18us-gaap_EarningsPerShareBasic
Earnings per share: Diluted	$ 1.10us-gaap_EarningsPerShareDiluted	$ 1.18us-gaap_EarningsPerShareDiluted

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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