Repurchases of Common Stock (Narrative) (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Feb. 03, 2015
Class of Stock Disclosures [Abstract]
Additional board authorization			$ 250,000,000
Repurchased common shares - shares	284,537	901,732
Repurchased common shares - average price per share		$ 69.57
Repurchase of common stock from open market	$ 22,023,000	$ 62,731,000