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Earnings Per Share (Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 88,132	$ 59,446
Weighted-average number of common shares outstanding	27,696	27,911
Dilutive stock awards	422	39
Diluted weighted-average number of common shares outstanding	28,118	27,950
Basic earnings per share	$ 3.18	$ 2.13
Diluted earnings per share	$ 3.13	$ 2.13

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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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