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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
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share, Basic and Diluted [Line Items]
Net income (loss) - numerator for earnings (loss) per common share	$ (30,010)	$ 140,962
Weighted average common shares outstanding (shares)	90,883,254	90,017,166
Denominator for earnings (loss) per common share - assuming dilution (shares)	91,743,759	91,139,348
Earnings (loss) per common share	$ (0.33)	$ 1.57
Earnings (loss) per common share - assuming dilution	$ (0.33)	$ 1.55
Stock Options and Deferred Compensation Agreements
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: share-based payment arrangements (shares)	455,001	850,292
Restricted Stock and Restricted Stock Units
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: share-based payment arrangements (shares)	405,504	271,890
Stock Options
Earnings Per Share, Basic and Diluted [Line Items]
Antidilutive securities excluded from computation of earnings (loss) per share, amount (shares)	0	0

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