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Earnings Per Share (Reconciliation of EPS) (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
Basic EPS: [Abstract]
Net income	$ 81,859	$ 56,150	$ 72,266	$ 61,348	$ 45,760	$ 55,435	$ 58,819	$ 18,925	$ 271,623	$ 178,939	$ 168,826
Net income, basic shares									59,421	58,950	58,458
Basic net income per share	$ 1.38	$ 0.94	$ 1.22	$ 1.04	$ 0.77	$ 0.94	$ 1.00	$ 0.32	$ 4.57	$ 3.04	$ 2.89
Effect of dilutive securities: [Abstract]
Stock compensation plans, shares									583	763	899
Earnings Per Share, Diluted [Abstract]
Net income	$ 81,859	$ 56,150	$ 72,266	$ 61,348	$ 45,760	$ 55,435	$ 58,819	$ 18,925	$ 271,623	$ 178,939	$ 168,826
Shares net income, Diluted									60,004	59,713	59,357
Diluted net income per share	$ 1.36	$ 0.93	$ 1.21	$ 1.02	$ 0.76	$ 0.93	$ 0.99	$ 0.32	$ 4.53	$ 3.00	$ 2.84

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