Stockholders' Equity Stockholders' Equity (Treasury stock activity) (Details) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Stockholders' Equity Note [Abstract]
Treasury stock (in shares)	52,159	49,488	50,318	49,061
Stock awards (in shares)	(547)	(944)
Treasury stock purchases (in shares)	2,388	1,371