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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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Net income	$ 110,270	$ 87,853	$ 193,339	$ 164,437
Weighted average number of common shares outstanding	31,049	30,901	31,055	30,956
Dilutive stock awards	425	275	425	246
Diluted weighted average number of common shares outstanding	31,474	31,176	31,480	31,202
Basic earnings per share	$ 3.55	$ 2.84	$ 6.23	$ 5.31
Diluted earnings per share	$ 3.50	$ 2.82	$ 6.14	$ 5.27

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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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