Shareholders' Equity and Earnings per Share (Details) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Weighted-average shares outstanding:
Basic (in shares)	140,738	146,578	142,786	147,499
Dilutive effect of equity awards (in shares)	890	1,224	917	1,147
Diluted weighted-average shares outstanding (in shares)	141,628	147,802	143,703	148,646
Anti-dilutive share awards (in shares)	288	12	301	168