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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Basic EPS: [Abstract]
Net income	$ 30,242	$ 46,718	$ 41,426	$ 50,440	$ 39,360	$ 38,502	$ 43,601	$ 37,032	$ 168,826	$ 158,495	$ 165,861
Net income, basic shares									58,458	57,889	57,212
Basic net income per share	$ 0.52	$ 0.80	$ 0.71	$ 0.87	$ 0.68	$ 0.66	$ 0.75	$ 0.64	$ 2.89	$ 2.74	$ 2.90
Effect of dilutive securities: [Abstract]
Stock compensation plans, shares									899	858	944
Earnings Per Share, Diluted [Abstract]
Net income	$ 30,242	$ 46,718	$ 41,426	$ 50,440	$ 39,360	$ 38,502	$ 43,601	$ 37,032	$ 168,826	$ 158,495	$ 165,861
Shares net income, Diluted									59,357	58,747	58,156
Diluted net income per share	$ 0.51	$ 0.79	$ 0.70	$ 0.85	$ 0.67	$ 0.66	$ 0.74	$ 0.63	$ 2.84	$ 2.70	$ 2.85

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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