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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						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 98,582	$ 91,028	$ 88,132	$ 38,204	$ 46,884	$ 59,446	$ 277,742	$ 144,534
Weighted-average number of common shares outstanding	27,775			27,802			27,730	27,844
Dilutive stock awards	613			215			538	123
Diluted weighted-average number of common shares outstanding	28,388			28,017			28,268	27,967
Basic earnings per share	$ 3.55			$ 1.37			$ 10.02	$ 5.19
Diluted earnings per share	$ 3.47			$ 1.36			$ 9.83	$ 5.17

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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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