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Shareholders' Equity (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 29,229		$ 29,229
Change in management estimate of stock based compensation expense amortization			13,440
Total intrinsic value of options exercised			37,171
Aggregate intrinsic value of options exercisable	82,557		82,557
Share Price	$ 30.91		$ 30.91
Weighted average exercise price per share	$ 18.54		$ 18.54
Total options that were outstanding	22,146,000		22,146,000
Total options that were exercisable	6,676,000		6,676,000
Shares purchased and retired			4,879,000
Company purchased, cost			145,269
Remaining stock repurchase authorization amount			45,744
Dividends declared per common share	$ 0.00	$ 0.00	$ 0.20	$ 0.15
Dividends, Common Stock, Cash			$ 34,400	$ 26,117
2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of active equity compensation plans	1
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	20,000,000		20,000,000
Vesting Rate When Specified Diluted Earnings Per Share Targets are Achieved	50.00%
Vesting Rate Higher Specified Diluted Earnings Per Share Targets are Achieved	50.00%

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

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