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Shareholders' Equity (Share Repurchase) (Details) - USD ($) $ in Thousands, shares in Millions	9 Months Ended
	Sep. 30, 2015	Nov. 06, 2015
Equity, Class of Treasury Stock [Line Items]
Purchase of treasury stock	$ 38,942
Share Repurchase Program 2013 [Member]
Equity, Class of Treasury Stock [Line Items]
Share repurchase, authorized amount (in shares)	10.0
Purchase of treasury stock (in shares)	3.5
Purchase of treasury stock	$ 38,900
Number of accumulated shares repurchased (in shares)	9.6
Value of shares repurchased	$ 79,900
Remaining number of shares approved under stock repurchase program (in shares)	0.4
Share Repurchase Program 2015 [Member]
Equity, Class of Treasury Stock [Line Items]
Share repurchase, authorized amount (in dollars)	$ 100,000
Subsequent Event [Member] | November 2015 Accelerated Share Repurchase [Member]
Equity, Class of Treasury Stock [Line Items]
Share repurchase, authorized amount (in dollars)		$ 50,000

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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