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Earnings Per Share (Basic and Diluted Earnings) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Net income	$ 67,874	$ 144,883	$ 140,204	$ 122,641	$ 121,234	$ 130,801	$ 110,270	$ 83,069	$ 475,602	$ 445,374	$ 327,438
Weighted average number of common shares outstanding									31,092	31,038	30,957
Dilutive stock awards									402	474	324
Diluted weighted average number of common shares outstanding									31,494	31,512	31,281
Basic earnings per share	$ 2.19	$ 4.65	$ 4.51	$ 3.95	$ 3.91	$ 4.22	$ 3.55	$ 2.67	$ 15.30	$ 14.35	$ 10.58
Diluted earnings per share	$ 2.17	$ 4.59	$ 4.45	$ 3.88	$ 3.84	$ 4.15	$ 3.50	$ 2.64	$ 15.10	$ 14.13	$ 10.47

X

- 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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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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