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Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accounting Policies [Abstract]
Net income	$ 139,838	$ 88,737
Shares used to compute basic earnings per common share	157,434	159,091
Dilutive effect of stock options (in shares)	5,990	3,651
Shares used to compute diluted earnings per common share	163,424	162,742
Basic earnings per common share (in USD per share)	$ 0.89	$ 0.56
Diluted earnings per common share (in USD per share)	$ 0.86	$ 0.55

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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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