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Shareholders' Equity (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended	3 Months Ended		9 Months Ended			3 Months Ended
	May 21, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Common Stock Buyback [Member]	Sep. 30, 2014 2014 Plan [Member] Tranche One [Member]	Sep. 30, 2014 2014 Plan [Member] Tranche Two [Member]	Oct. 21, 2014 Subsequent Event [Member] Common Stock Buyback [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate							50.00%	50.00%
Unrecognized compensation cost		$ 29,768		$ 29,768
Total intrinsic value of options exercised				79,830
Aggregate intrinsic value of options exercisable		175,270		175,270
Share Price		$ 36.16		$ 36.16
Weighted average exercise price per share		$ 19.49		$ 19.49
Total options that were outstanding		19,535		19,535
Total options that were exercisable		10,516		10,516
Shares purchased and retired						6,305
Company purchased, cost						215,796
Remaining stock repurchase authorization amount									65,274
Dividends declared per common share	$ 0.22	$ 0	$ 0	$ 0.22	$ 0.20
Cash dividends declared on the Company's common stock				$ 36,980	$ 34,400

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

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Unrecognized cost of unvested share-based compensation awards.

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Percentage of vesting of share-based compensation awards.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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