Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Minimum average share price triggering dilutive effect (usd per share)	$ 65.72
Net income	$ 58,135us-gaap_NetIncomeLoss	$ 40,840us-gaap_NetIncomeLoss
Weighted Average Common Shares, Basic EPS	48,724,000	49,929,000
Weighted Average Common Shares, Dilutive effect of nonvested share awards	328,000	434,000
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements, Per Share	$ 0	$ (0.01)
Weighted Average Common Shares, Diluted EPS	49,052,000	50,363,000
EPS, Basic (in dollars per share)	$ 1.19us-gaap_EarningsPerShareBasic	$ 0.82us-gaap_EarningsPerShareBasic
EPS, Diluted (in dollars per share)	$ 1.19us-gaap_EarningsPerShareDiluted	$ 0.81us-gaap_EarningsPerShareDiluted
Antidilutive options outstanding	0	0

Average Share Price, Conversion Spread, Minimum Average Price Triggering Dilutive Effect

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- Definition

Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements, Per Share

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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- Definition

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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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