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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								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 72,416	$ 98,582	$ 91,028	$ 88,132	$ 32,019	$ 38,204	$ 46,884	$ 59,446	$ 350,158	$ 176,553	$ 176,253
Weighted-average number of common shares outstanding (for basic calculation)									27,740	27,823	28,491
Dilutive stock awards									555	139	70
Weighted-average number of common shares outstanding (for diluted calculation)									28,295	27,962	28,561
Basic earnings per share	$ 2.61	$ 3.55	$ 3.28	$ 3.18	$ 1.15	$ 1.37	$ 1.69	$ 2.13	$ 12.62	$ 6.35	$ 6.19
Diluted earnings per share	$ 2.55	$ 3.47	$ 3.22	$ 3.13	$ 1.15	$ 1.36	$ 1.68	$ 2.13	$ 12.38	$ 6.31	$ 6.17

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- Definition

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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