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Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share, Basic and Diluted [Line Items]
Net income - numerator for earnings per common share	$ 93,903	$ 26,946	$ 234,865	$ 80,885
Weighted average common shares outstanding (shares)	90,326,747	88,897,203	90,172,812	88,772,831
Denominator for earnings per common share - assuming dilution (shares)	91,270,848	90,112,284	91,205,953	90,044,639
Earnings per common share	$ 1.04	$ 0.30	$ 2.60	$ 0.91
Earnings per common share - assuming dilution	$ 1.03	$ 0.30	$ 2.58	$ 0.90
Stock Options and Deferred Compensation Agreements [Member]
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: share-based payment arrangements (shares)	696,007	850,870	773,149	899,594
Restricted Stock and Restricted Stock Units [Member]
Earnings Per Share, Basic and Diluted [Line Items]
Effect of dilutive securities: share-based payment arrangements (shares)	248,094	364,211	259,992	372,214
Stock Options [Member]
Earnings Per Share, Basic and Diluted [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	0	1,002,391	0	1,002,391
Antidilutive securities excluded from computation of earnings per share, exercise price		$ 24.79		$ 24.79

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