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Earnings Per Share (Basic and Diluted Earnings) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income	$ 121,234us-gaap_NetIncomeLoss	$ 130,801us-gaap_NetIncomeLoss	$ 110,270us-gaap_NetIncomeLoss	$ 83,069us-gaap_NetIncomeLoss	$ 79,622us-gaap_NetIncomeLoss	$ 83,379us-gaap_NetIncomeLoss	$ 87,853us-gaap_NetIncomeLoss	$ 76,584us-gaap_NetIncomeLoss	$ 445,374us-gaap_NetIncomeLoss	$ 327,438us-gaap_NetIncomeLoss	$ 278,000us-gaap_NetIncomeLoss
Weighted average number of common shares outstanding									31,038us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	30,957us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	31,513us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive stock awards									474us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	324us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	270us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted weighted average number of common shares outstanding									31,512us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	31,281us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	31,783us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share	$ 3.91us-gaap_EarningsPerShareBasic	$ 4.22us-gaap_EarningsPerShareBasic	$ 3.55us-gaap_EarningsPerShareBasic	$ 2.67us-gaap_EarningsPerShareBasic	$ 2.57us-gaap_EarningsPerShareBasic	$ 2.70us-gaap_EarningsPerShareBasic	$ 2.84us-gaap_EarningsPerShareBasic	$ 2.47us-gaap_EarningsPerShareBasic	$ 14.35us-gaap_EarningsPerShareBasic	$ 10.58us-gaap_EarningsPerShareBasic	$ 8.82us-gaap_EarningsPerShareBasic
Diluted earnings per share	$ 3.84us-gaap_EarningsPerShareDiluted	$ 4.15us-gaap_EarningsPerShareDiluted	$ 3.50us-gaap_EarningsPerShareDiluted	$ 2.64us-gaap_EarningsPerShareDiluted	$ 2.53us-gaap_EarningsPerShareDiluted	$ 2.66us-gaap_EarningsPerShareDiluted	$ 2.82us-gaap_EarningsPerShareDiluted	$ 2.45us-gaap_EarningsPerShareDiluted	$ 14.13us-gaap_EarningsPerShareDiluted	$ 10.47us-gaap_EarningsPerShareDiluted	$ 8.75us-gaap_EarningsPerShareDiluted

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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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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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