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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				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 91,028	$ 88,132	$ 46,884	$ 59,446	$ 179,160	$ 106,330
Weighted-average number of common shares outstanding	27,720		27,819		27,708	27,865
Dilutive stock awards	580		116		501	77
Diluted weighted-average number of common shares outstanding	28,300		27,935		28,209	27,942
Basic earnings per share	$ 3.28		$ 1.69		$ 6.47	$ 3.82
Diluted earnings per share	$ 3.22		$ 1.68		$ 6.35	$ 3.81

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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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