Stock Repurchase (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended									9 Months Ended
	Sep. 30, 2014	Aug. 31, 2014	Jul. 31, 2014	Jun. 30, 2014	May 31, 2014	Apr. 30, 2014	Mar. 31, 2014	Feb. 28, 2014	Jan. 31, 2014	Sep. 30, 2014	Dec. 31, 2013	Nov. 18, 2013
Stock Repurchase [Abstract]
Outstanding common stock repurchase authorized, value												$ 600,000
Value remaining under total repurchase authorization	588,188									588,188	704,874	752,436
Number of shares repurchased	186,000	386,000	0	283,000	292,000	302,000	0	0	314,600	1,763,600
Amount of shares repurchased										$ 116,686