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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands			3 Months Ended		6 Months Ended
	Jun. 16, 2017	May 24, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost			$ 64,208		$ 64,208
Total intrinsic value of options exercised					37,976
Aggregate intrinsic value of options exercisable			$ 176,559		$ 176,559
Market value of Company's common stock			$ 53.78		$ 53.78
Weighted average exercise price per share			$ 21.21		$ 21.21
Total options outstanding			16,676		16,676
Total options exercisable			5,421		5,421
Dividends declared per common share		$ 0.28	$ 0.28	$ 0.26	$ 0.28	$ 0.26
Cash dividends paid per common share	$ 0.28
Cash dividends declared on the Company's common stock					$ 44,264	$ 42,001
Common Stock Buyback [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased and retired					2,357
Company purchased, cost					$ 120,041
Remaining stock repurchase authorization amount			$ 98,710		$ 98,710
2014 Plan [Member] | Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate					50.00%
2014 Plan [Member] | Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate					50.00%

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Aggregate dividends paid during the period for each share of common stock outstanding.

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