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Earnings (Loss) Per Share (Schedule of Earnings (Loss) Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share, Basic and Diluted [Line Items]
Net income (loss) - numerator for earnings (loss) per common share	$ 18,590	$ 93,903	$ (11,420)	$ 234,865
Weighted average common shares outstanding (shares)	91,103,151	90,326,747	90,993,810	90,172,812
Denominator for earnings (loss) per common share - assuming dilution (shares)	91,785,223	91,270,848	91,765,098	91,205,953
Earnings (loss) per common share	$ 0.20	$ 1.04	$ (0.13)	$ 2.60
Earnings (loss) per common share - assuming dilution	$ 0.20	$ 1.03	$ (0.13)	$ 2.58
Stock Options and Deferred Compensation Agreements
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: share-based payment arrangements (shares)	333,780	696,007	394,390	773,149
Restricted Stock and Restricted Stock Units
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: share-based payment arrangements (shares)	348,292	248,094	376,898	259,992
Stock Options
Earnings Per Share, Basic and Diluted [Line Items]
Antidilutive securities excluded from computation of earnings (loss) per share, amount (shares)	0	0	0	0

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