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Earnings Per Share (Basic and Diluted Earnings) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 140,204	$ 110,270	$ 262,845	$ 193,339
Weighted average number of common shares outstanding	31,120	31,049	31,044	31,055
Dilutive stock awards	406	425	481	425
Diluted weighted average number of common shares outstanding	31,526	31,474	31,525	31,480
Basic earnings per share	$ 4.51	$ 3.55	$ 8.47	$ 6.23
Diluted earnings per share	$ 4.45	$ 3.50	$ 8.34	$ 6.14

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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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